Relevant bibliographies by topics / Polyolefin

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Polyolefin'

Author: Grafiati
Published: 4 June 2021
Last updated: 22 June 2024

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Polyolefin.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Polyolefin"

1

Kresge, E. N. "Polyolefin Thermoplastic Elastomer Blends." Rubber Chemistry and Technology 64, no. 3 (July 1, 1991): 469–80. http://dx.doi.org/10.5254/1.3538564.

Full text
Abstract:
Abstract Thermoplastic elastomers based on blends of polyolefins are an important family of engineering materials. Their importance arises from a combination of rubbery properties along with their thermoplastic nature in contrast to thermoset elastomers. The development of polyolefin thermoplastic elastomer blends follows somewhat that of thermoplastic elastomers based on block copolymers such as styrene-butadiene-styrene triblock copolymer and multisegmented polyurethane thermoplastic elastomers which were instrumental in showing the utility of thermoplastic processing methods. Polyoleflns are based on coordination catalysts that do not easily lend themselves to block or multisegmented copolymer synthesis. However, since polyolefins have many important attributes favorable to useful elastomeric systems, there was considerable incentive to produce thermoplastic elastomers based on simple α-olefins by some means. Low density, chemical stability, weather resistance, and ability to accept compounding ingredients without compromising physical properties are highly desirable. These considerations led to the development of polyolefin thermoplastic elastomer blends, and two types are now widely used: blends of ethylene-propylene rubber (EPM) with polypropylene (PP) and blends of EPDM and PP in which the rubber phase is highly crosslinked. This article reviews the nature of these blends. Both physical and Theological properties are very dependent on the morphology and crosslink density of the blend system. Moreover, the usefulness of practical systems depends extensively on compounding technology based on added plasticizers and fillers.
APA, Harvard, Vancouver, ISO, and other styles
2

Zhang, Ni, Mingzhu Ding, and Yingjin Yuan. "Current Advances in Biodegradation of Polyolefins." Microorganisms 10, no. 8 (July 29, 2022): 1537. http://dx.doi.org/10.3390/microorganisms10081537.

Full text
Abstract:
Polyolefins, including polyethylene (PE), polypropylene (PP) and polystyrene (PS), are widely used plastics in our daily life. The excessive use of plastics and improper handling methods cause considerable pollution in the environment, as well as waste of energy. The biodegradation of polyolefins seems to be an environmentally friendly and low-energy consumption method for plastics degradation. Many strains that could degrade polyolefins have been isolated from the environment. Some enzymes have also been identified with the function of polyolefin degradation. With the development of synthetic biology and metabolic engineering strategies, engineered strains could be used to degrade plastics. This review summarizes the current advances in polyolefin degradation, including isolated and engineered strains, enzymes and related pathways. Furthermore, a novel strategy for polyolefin degradation by artificial microbial consortia is proposed, which would be helpful for the efficient degradation of polyolefin.
APA, Harvard, Vancouver, ISO, and other styles
3

Goring, Paul D., Colin Morton, and Peter Scott. "End-functional polyolefins for block copolymer synthesis." Dalton Transactions 48, no. 11 (2019): 3521–30. http://dx.doi.org/10.1039/c9dt00087a.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Fazekas, Timothy J., Jill W. Alty, Eliza K. Neidhart, Austin S. Miller, Frank A. Leibfarth, and Erik J. Alexanian. "Diversification of aliphatic C–H bonds in small molecules and polyolefins through radical chain transfer." Science 375, no. 6580 (February 4, 2022): 545–50. http://dx.doi.org/10.1126/science.abh4308.

Full text
Abstract:
The ability to selectively introduce diverse functionality onto hydrocarbons is of substantial value in the synthesis of both small molecules and polymers. Herein, we report an approach to aliphatic carbon–hydrogen bond diversification using radical chain transfer featuring an easily prepared O -alkenylhydroxamate reagent, which upon mild heating facilitates a range of challenging or previously undeveloped aliphatic carbon–hydrogen bond functionalizations of small molecules and polyolefins. This broad reaction platform enabled the functionalization of postconsumer polyolefins in infrastructure used to process plastic waste. Furthermore, the chemoselective placement of ionic functionality onto a branched polyolefin using carbon–hydrogen bond functionalization upcycled the material from a thermoplastic into a tough elastomer with the tensile properties of high-value polyolefin ionomers.
APA, Harvard, Vancouver, ISO, and other styles
5

Zhu, Lei, Haojie Yu, Li Wang, Yusheng Xing, and Bilal Ul Amin. "Advances in the Synthesis of Polyolefin Elastomers with “Chain-walking” Catalysts and Electron Spin Resonance Research of Related Catalytic Systems." Current Organic Chemistry 25, no. 8 (April 28, 2021): 935–49. http://dx.doi.org/10.2174/1385272825666210126100641.

Full text
Abstract:
In recent years, polyolefin elastomers play an increasingly important role in industry. The late transition metal complex catalysts, especially α-diimine Ni(II) and α-diimine Pd(II) complex catalysts, are popular “chain-walking” catalysts. They can prepare polyolefin with various structures, ranging from linear configuration to highly branched configuration. Combining the “chain-walking” characteristic with different polymerization strategies, polyolefins with good elasticity can be obtained. Among them, olefin copolymer is a common way to produce polyolefin elastomers. For instance, strictly defined diblock or triblock copolymers with excellent elastic properties were synthesized by adding ethylene and α-olefin in sequence. As well as the incorporation of polar monomers may lead to some unexpected improvement. Chain shuttling polymerization can generate multiblock copolymers in one pot due to the interaction of the catalysts with chain shuttling agent. Furthermore, when regarding ethylene as the sole feedstock, owing to the “oscillation” of the ligands of the asymmetric catalysts, polymers with stereo-block structures can be generated. Generally, the elasticity of these polyolefins mainly comes from the alternately crystallineamorphous block structures, which is closely related to the characteristic of the catalytic system. To improve performance of the catalysts and develop excellent polyolefin elastomers, research on the catalytic mechanism is of great significance. Electron spin resonance (ESR), as a precise method to detect unpaired electron, can be applied to study transition metal active center. Therefore, the progress on the exploration of the valence and the proposed configuration of catalyst active center in the catalytic process by ESR is also reviewed.
APA, Harvard, Vancouver, ISO, and other styles
6

Peng, Wenhao. "High-value recycling and biodegradation of polyolefin materials." Applied and Computational Engineering 23, no. 7 (December 4, 2023): 25–29. http://dx.doi.org/10.54254/2755-2721/23/ojs/20230604.

Full text
Abstract:
The pollution of plastic materials has seriously affected global environmental problems. Polyolefin materials are widely used as raw materials for plastics. This is due to their practical physical properties and low cost. However, there are major challenges in the disposal of waste polyolefin materials. Recycling and degradation have emerged as the two main approaches for the treatment of plastic waste today. Through a comprehensive literature analysis and review of methods, this paper provides an in-depth study of recycling and biodegradation of polyolefin materials. The study is based on a detailed search of several papers through Google Scholar in order to provide valuable insights into the different methods that are used for the recycling and biodegradation of polyolefins. The review summarizes the most effective technologies for recycling and biodegradation, while highlighting recent advances and future directions in the field. In particular, the research has focused on two main approaches: closed-loop recycling and chemical recovery. The latter technology is aimed at non-polluting biodegradation, which has become an increasingly important topic of interest for the scientific community. Given the urgency of the environmental challenges posed by polyolefins, the development of efficient and sustainable recycling and degradation methods is essential to create a circular economy and ensure a sustainable future.
APA, Harvard, Vancouver, ISO, and other styles
7

Peng, Wenhao. "High-value recycling and biodegradation of polyolefin materials." Applied and Computational Engineering 23, no. 1 (November 7, 2023): 25–29. http://dx.doi.org/10.54254/2755-2721/23/20230604.

Full text
Abstract:
The pollution of plastic materials has seriously affected global environmental problems. Polyolefin materials are widely used as raw materials for plastics. This is due to their practical physical properties and low cost. However, there are major challenges in the disposal of waste polyolefin materials. Recycling and degradation have emerged as the two main approaches for the treatment of plastic waste today. Through a comprehensive literature analysis and review of methods, this paper provides an in-depth study of recycling and biodegradation of polyolefin materials. The study is based on a detailed search of several papers through Google Scholar in order to provide valuable insights into the different methods that are used for the recycling and biodegradation of polyolefins. The review summarizes the most effective technologies for recycling and biodegradation, while highlighting recent advances and future directions in the field. In particular, the research has focused on two main approaches: closed-loop recycling and chemical recovery. The latter technology is aimed at non-polluting biodegradation, which has become an increasingly important topic of interest for the scientific community. Given the urgency of the environmental challenges posed by polyolefins, the development of efficient and sustainable recycling and degradation methods is essential to create a circular economy and ensure a sustainable future.
APA, Harvard, Vancouver, ISO, and other styles
8

Pasch, Harald, Lars-Christian Heinz, Tibor Macko, and Wolf Hiller. "High-temperature gradient HPLC and LC-NMR for the analysis of complex polyolefins." Pure and Applied Chemistry 80, no. 8 (January 1, 2008): 1747–62. http://dx.doi.org/10.1351/pac200880081747.

Full text
Abstract:
The synthesis and characterization of polyolefins continues to be one of the most important areas for academic and industrial polymer research. One consequence of the development of new "tailor-made" polyolefins is the need for new and improved analytical techniques for the analysis of polyolefins with respect to molar mass and chemical composition distribution. The present article briefly reviews different new and relevant techniques for polyolefin analysis. Crystallization analysis fractionation is a powerful new technique for the analysis of short-chain branching in linear low-density polyethylene (LLDPE) and the analysis of polyolefin blends and copolymers regarding chemical composition. For the fast analysis of the chemical composition distribution, a new high-temperature gradient high-performance liquid chromatography (HPLC) system has been developed. The efficiency of this system for the separation of various olefin copolymers is demonstrated. The correlation between molar mass and chemical composition can be accessed by on-line coupling of high-temperature size exclusion chromatography (HT-SEC) and 1H NMR spectroscopy. It is shown that the on-line NMR analysis of chromatographic fractions yields information on microstructure and tacticity in addition to molar mass and copolymer composition.
APA, Harvard, Vancouver, ISO, and other styles
9

Tumasev, R. V., O. A. Arkatov, M. A. Goryaynov, V. K. Dudchenko, E. A. Mayer, and A. N. Pestryakov. "Modernization of Technology and Organization of Production of Triethylaluminium Co-Catalyst for Olefin Polymerization." Advanced Materials Research 772 (September 2013): 15–19. http://dx.doi.org/10.4028/www.scientific.net/amr.772.15.

Full text
Abstract:
Actual and prospective Russian market of polyolefins is analyzed. Growth of polyolefin capacities and triethylaluminium consumption as co-catalyst with Ti-Mg catalysts for polypropylene production in Russian Federation is shown. Quality of Russian and foreign triethylaluminium is compared. Project of modernization of TEA installation at Tomskneftekhim LTD is presented.
APA, Harvard, Vancouver, ISO, and other styles
10

Shi, Bo, and Mike Shlepr. "Thermoplastic films containing lignin and their optical polarization properties." Journal of Polymer Engineering 36, no. 5 (July 1, 2016): 521–28. http://dx.doi.org/10.1515/polyeng-2015-0052.

Full text
Abstract:
Abstract A soda lignin, Protobind 2400, was blended at ratios up to thirty weight percent with polyolefins or the aliphatic-aromatic copolyester Ecoflex and films were cast with a twin-screw extruder. The mechanical properties, structure, and optical properties of the resultant films were characterized by tensile tests and microscopy. Films for all blends of this modified lignin were successfully cast without operational issues. Film elongation was maintained for both the polyolefins and Ecoflex. Lignin significantly increased the modulus of the polyethylene films but decreased the modulus of the polypropylene and Ecoflex films. Lignin was found as lamellae oriented in the machine direction of the polyolefin films, but as spherical domains in the Ecoflex film. It was concluded that the oriented lamellar structure was critical to the behavior of the polyolefin-lignin blends as optical polarization films (OPFs). Additional development around improvement of this property, which for the prototypes produced here was about one-tenth the efficiency of commercially available OPFs, to produce a sustainable OPF was recommended.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Polyolefin"

1

Jones, Robert Lawrence. "Photochromic switches on polyolefin catalysts." [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=976729598.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Oiarzabal, Lierni. "Miscibility study of polyolefin blends." Thesis, Imperial College London, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360505.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Finlay, Joanna. "A study of polyolefin blends." Thesis, University of Bristol, 2003. http://hdl.handle.net/1983/765bb977-09b6-424e-970d-4c052a37f3f3.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Chaudhary, Bharat Indu. "The relaxation characteristics of polyolefin foams." Thesis, Imperial College London, 1990. http://hdl.handle.net/10044/1/47801.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Bani-Hani, Manar. "Polyolefin plastomers in composites for flooring applications." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape15/PQDD_0005/MQ39471.pdf.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Sriniwas, Ganti Ravi. "Estimation and control of a polyolefin reactor." Thesis, Georgia Institute of Technology, 1992. http://hdl.handle.net/1853/10266.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Ogbobe, Okoro. "Dispersion of additive masterbatches in polyolefin plastics." Thesis, Loughborough University, 1985. https://dspace.lboro.ac.uk/2134/15384.

Full text
Abstract:
There has been a growing trend in recent years for polymer product manufacturers to use natural polymer and additive masterbatches instead of premixed compounds. For both polymer converters and polymer manufacturers, masterbatching makes economic sense. For the converter, the advantage is in the ability to buy and store in bulk a small number of base polymers which may be modified according to the dictates of the order book. This prevents the need to maintain an inventory of a large number of special compounds. Masterbatch base is very often low molecular weight polyethylene or some suitable low molecular weight compound. They are usually used with a wide range of polymer compounds. Manufacturers assume good additive dispersion in the products with use of masterbatch. This study investigates the quality of dispersion in masterbatches and the extent they can be used with varying polyolefin polymers. Also investigated is how additive particles are transferred from the masterbatch to another polymer during mixing and any morphological features that might relate to the degree of dispersion. A quantitative dispersion procedure in polyolefin products is also sought. X-ray microradiography, light microscopy and ultraviolet microscopy have enabled pigment and ultraviolet absorber dispersion in masterbatches and products to be studied. Pigment dispersion in low density polyethylene masterbatch is almost invariably bad. Iron oxide particularly was found to be the most poorly dispersed compared to other inorganics such as zinc sulphide, titanium dioxide and cadmium sulphide. On the other hand, the distribution of Cyasorb 531 in LDPE masterbatch is uniform. The degree of dispersion of UV absorber in polyethylene products depends on the difference between the melt flow index between the masterbatch base and the base polymer. Simulated sunlight exposure experiments have shown that increased absorber distribution significantly increases photostability of a high MFI HDPE/LDPE UV masterbatch blend. A semi-automatic procedure for quantifying pigment dispersion in polyolefin products has been developed. It involves a motorised stage scanning of a microtomed section of a polyolefin product with measurements being made with a photometer operating in a dark-field illumination and interfaced to a microcomputer. The procedure has enabled the point of significant agglomeration as well as the effect of shear rate and temperature on degree of dispersion in extruded products to be determined.
APA, Harvard, Vancouver, ISO, and other styles
8

Khare, Neeraj Prasad. "Predictive Modeling of Metal-Catalyzed Polyolefin Processes." Diss., Virginia Tech, 2003. http://hdl.handle.net/10919/11065.

Full text
Abstract:
This dissertation describes the essential modeling components and techniques for building comprehensive polymer process models for metal-catalyzed polyolefin processes. The significance of this work is that it presents a comprehensive approach to polymer process modeling applied to large-scale commercial processes. Most researchers focus only on polymerization mechanisms and reaction kinetics, and neglect physical properties and phase equilibrium. Both physical properties and phase equilibrium play key roles in the accuracy and robustness of a model. This work presents the fundamental principles and practical guidelines used to develop and validate both steady-state and dynamic simulation models for two large-scale commercial processes involving the Ziegler-Natta polymerization to produce high-density polyethylene (HDPE) and polypropylene (PP). It also provides a model for the solution polymerization of ethylene using a metallocene catalyst. Existing modeling efforts do not include physical properties or phase equilibrium in their calculations. These omissions undermine the accuracy and predictive power of the models. The forward chapters of the dissertation discuss the fundamental concepts we consider in polymer process modeling. These include physical and thermodynamic properties, phase equilibrium, and polymerization kinetics. The later chapters provide the modeling applications described above.
Ph. D.
APA, Harvard, Vancouver, ISO, and other styles
9

Dabrowska, Izabela. "Polyolefin nanocomposite with different types of nanofillers." Doctoral thesis, Università degli studi di Trento, 2013. https://hdl.handle.net/11572/368488.

Full text
Abstract:
The PhD project was details on the polyolefin nanocomposites compounding, processing and preparation. Two different types of polymer matrix with low melt flow rate for fiber forming polymers have been selected; high density polyethylene (HDPE) and isotactic polypropylene (PP). High density polyethylene was compounded with double layered hydrotalcite (LDH) while in case of polypropylene reinforcement by adding fumed silica and kaolinite was performed. In this way the influence of the nanofiller type on the thermo-mechanical properties of the prepared nanocomposites were studied. In recent years several research efforts have been focused on the preparation of polymer/layered inorganic nanocomposites because of the excellent properties in comparison to the neat polymer. The main reason of this interest lies certainly in the properties of the nanoclay, like high stiffness, and high aspect ratio, that induce enhancement of various polymer properties (thermal stability, mechanical properties, flame resistance and gas barrier) even with small amount of filler. Moreover, nanocomposites can be processed more easily than microcomposite. Recently literature evidences a lot of progress in the nanofilled bulk materials; on the other hand, there are relatively a few publications on fibers made of nanofilled polyolefins. For instance, PP fibers were produced with various types of nanofillers, e.g. layered silicates, carbon nanotubes and montmorillonite. In the case of HDPE, composite fibers containing calcium carbonate, carbon nanotubes, silica and layered silicates were reported. It is worth to mention that so far, no publication could be found on this work using the same nanofillers with the same matrix. This thesis is divided into six chapters; Introduction and Background, Experimental activities, after obtained Results with discussions are reported and finally Conclusions. In the Introduction and Background (Chapter I and II) general information about nanocomposites and characteristic of different nanofillers type were summarized. After that polymer processing method with particular attention on the melt extrusion and fiber spinning were described. Third Chapter is dedicated to the experimental part. Here, the used material characterization, nanocomposite preparation procedure and description of experimental techniques were reported. All nanocomposites were characterized by different experimental techniques. First nanofiller morphology by microscope (SEM and TEM) and X-ray diffraction technique was tested. Thermal stability was investigated by Thermal Gravimetric Analysis (TGA) and crystallization behavior by Differential Scanning Calorimetry (DSC). Finally mechanical properties were characterized by tensile test, Dynamical Mechanical Thermal Analysis (DMTA) and creep test. The Results and Discussion have been divided into two parts; first one was dedicated to the high density polyethylene layered double hydrotalcite nanocomposites (HDPE-LDH), while in the second polypropylene with fumed silica (PP-FS) and kaolinite (PP-K) nanocomposite were described. i. High density polyethylene hydrotalcite (HDPE-LDH) nanocomposites after different process of plates and fibers production will be compared in Chapter IV. At the beginning a polypropylene matrix, suitable for fiber production, was firstly melt compounded with organically modified hydrotalcite up to 5% by wt. Similar compositions with up to 3% wt. of LDH were performed by melt spinning. The incorporation of the clay into both bulk and fiber nanocomposite enhanced the thermal stability and induced heterogeneous nucleation of HDPE. Hydrotalcite positively affected the mechanical properties in term of higher Young’s modulus and tensile strength. After the preliminary characterization on bulk and as-spun material the fibers were hot drawn up to draw ratio (DR) 20. XRD analysis revealed intercalation with high degree of exfoliation for the composites with 1-2% wt. of LDH. For this compositions higher elastic modulus 9.0 GPa - 9.3 GPa (with respect to 8.0 GPa of the neat HDPE), and maintain tensile strength and deformation at break were observed. Moreover, the addition of low amount of LDH significantly improved the creep stability. ii. Nanocomposites of isotactic polypropylene fumed silica (PP-FS) were described in the Chapter V. Two types of hydrophobic fumed silica with different surface area (170m2•g-1 and 150m2•g-1) and surface treatment (treated respectively by dimethyldichlorosilane and octylsilane) up to 2% vol. were used. Similar as in case of HDPE-LDH nanocomposites plates production and characterization was a preliminary step to select the best compositions for the fiber preparation. After that, the work has been focused on the iPP-FS fiber production. Introduction of the nanofiller enhanced thermal stability and mechanical properties of the nanocomposite. Elastic modulus at draw ratio 10 increased from 5.3 GPa for neat iPP up to 7.5 – 8.6 GPa for compositions with 0.25 – 0.5% vol. Together with this improvement enhancement in strength at break and maintaining deformation at break were observed. Moreover, isothermal creep tests evidenced improvement in the creep stability due to the FS introduction, over the whole range of investigated draw ratios. iii. The last results of recent research dedicated to the polypropylene kaolinite (PP-K) nanocomposites are reported in Appendix 1. Nanocomposite fibers were successfully spun up to draw ratio (DR) 15 at very high nanofiller content up to 30% wt. The presence of kaolinite not only increased the thermal stability but also enhanced elastic modulus up to 5.6 GPa – 7.0 GPa for compositions with 1% up to 30% wt. of kaolinite, in comparison to 5.4 GPa for neat PP at draw ratio 10. Moreover, for the composition with 10% wt. of kaolinite better drawability with maximum modulus was obtained in comparison to neat PP. Finally the most important observation made on polyolefin nanocomposites fibers were summarized in the Chapter VI. It can be concluded that polyolefin fibers nanocomposites were successfully prepared by two different processing conditions: melt compounding and melt spinning followed by hot drawing. In case of plates the introduction of nanosilica remarkably improved the thermal stability and elastic modulus, with retention of the pristine tensile properties at break. Nanocomposites fibers showed a higher improvement of the elastic modulus with respect to the nanocomposites plates containing the same percentage of nanofiller. Moreover, the introduction of the nanofiller enhanced tensile dynamic mechanical properties especially for higher draw ratio. Similar behavior was also observed in case of creep compliance. Higher creep stability was observed for the drawn fibers with nanofiller in comparison to neat polymer. This behavior could be a consequence of the different orientation and morphology related to the crystallinity developed in the spinning. These results confirmed that polyolefin containing nanofiller could be easily spun into nanofilled fiber. TEM images revealed how the experienced improvements of the mechanical properties could be probably related to the orientation of nanofiller aggregates along the strain direction and to the consequent increase of the filler-matrix interfacial area.
APA, Harvard, Vancouver, ISO, and other styles
10

Dabrowska, Izabela. "Polyolefin nanocomposite with different types of nanofillers." Doctoral thesis, University of Trento, 2013. http://eprints-phd.biblio.unitn.it/1103/1/Izabela_Dabrowska_PhD_Thesis.pdf.

Full text
Abstract:
The PhD project was details on the polyolefin nanocomposites compounding, processing and preparation. Two different types of polymer matrix with low melt flow rate for fiber forming polymers have been selected; high density polyethylene (HDPE) and isotactic polypropylene (PP). High density polyethylene was compounded with double layered hydrotalcite (LDH) while in case of polypropylene reinforcement by adding fumed silica and kaolinite was performed. In this way the influence of the nanofiller type on the thermo-mechanical properties of the prepared nanocomposites were studied. In recent years several research efforts have been focused on the preparation of polymer/layered inorganic nanocomposites because of the excellent properties in comparison to the neat polymer. The main reason of this interest lies certainly in the properties of the nanoclay, like high stiffness, and high aspect ratio, that induce enhancement of various polymer properties (thermal stability, mechanical properties, flame resistance and gas barrier) even with small amount of filler. Moreover, nanocomposites can be processed more easily than microcomposite. Recently literature evidences a lot of progress in the nanofilled bulk materials; on the other hand, there are relatively a few publications on fibers made of nanofilled polyolefins. For instance, PP fibers were produced with various types of nanofillers, e.g. layered silicates, carbon nanotubes and montmorillonite. In the case of HDPE, composite fibers containing calcium carbonate, carbon nanotubes, silica and layered silicates were reported. It is worth to mention that so far, no publication could be found on this work using the same nanofillers with the same matrix. This thesis is divided into six chapters; Introduction and Background, Experimental activities, after obtained Results with discussions are reported and finally Conclusions. In the Introduction and Background (Chapter I and II) general information about nanocomposites and characteristic of different nanofillers type were summarized. After that polymer processing method with particular attention on the melt extrusion and fiber spinning were described. Third Chapter is dedicated to the experimental part. Here, the used material characterization, nanocomposite preparation procedure and description of experimental techniques were reported. All nanocomposites were characterized by different experimental techniques. First nanofiller morphology by microscope (SEM and TEM) and X-ray diffraction technique was tested. Thermal stability was investigated by Thermal Gravimetric Analysis (TGA) and crystallization behavior by Differential Scanning Calorimetry (DSC). Finally mechanical properties were characterized by tensile test, Dynamical Mechanical Thermal Analysis (DMTA) and creep test. The Results and Discussion have been divided into two parts; first one was dedicated to the high density polyethylene layered double hydrotalcite nanocomposites (HDPE-LDH), while in the second polypropylene with fumed silica (PP-FS) and kaolinite (PP-K) nanocomposite were described. i. High density polyethylene hydrotalcite (HDPE-LDH) nanocomposites after different process of plates and fibers production will be compared in Chapter IV. At the beginning a polypropylene matrix, suitable for fiber production, was firstly melt compounded with organically modified hydrotalcite up to 5% by wt. Similar compositions with up to 3% wt. of LDH were performed by melt spinning. The incorporation of the clay into both bulk and fiber nanocomposite enhanced the thermal stability and induced heterogeneous nucleation of HDPE. Hydrotalcite positively affected the mechanical properties in term of higher Young’s modulus and tensile strength. After the preliminary characterization on bulk and as-spun material the fibers were hot drawn up to draw ratio (DR) 20. XRD analysis revealed intercalation with high degree of exfoliation for the composites with 1-2% wt. of LDH. For this compositions higher elastic modulus 9.0 GPa - 9.3 GPa (with respect to 8.0 GPa of the neat HDPE), and maintain tensile strength and deformation at break were observed. Moreover, the addition of low amount of LDH significantly improved the creep stability. ii. Nanocomposites of isotactic polypropylene fumed silica (PP-FS) were described in the Chapter V. Two types of hydrophobic fumed silica with different surface area (170m2•g-1 and 150m2•g-1) and surface treatment (treated respectively by dimethyldichlorosilane and octylsilane) up to 2% vol. were used. Similar as in case of HDPE-LDH nanocomposites plates production and characterization was a preliminary step to select the best compositions for the fiber preparation. After that, the work has been focused on the iPP-FS fiber production. Introduction of the nanofiller enhanced thermal stability and mechanical properties of the nanocomposite. Elastic modulus at draw ratio 10 increased from 5.3 GPa for neat iPP up to 7.5 – 8.6 GPa for compositions with 0.25 – 0.5% vol. Together with this improvement enhancement in strength at break and maintaining deformation at break were observed. Moreover, isothermal creep tests evidenced improvement in the creep stability due to the FS introduction, over the whole range of investigated draw ratios. iii. The last results of recent research dedicated to the polypropylene kaolinite (PP-K) nanocomposites are reported in Appendix 1. Nanocomposite fibers were successfully spun up to draw ratio (DR) 15 at very high nanofiller content up to 30% wt. The presence of kaolinite not only increased the thermal stability but also enhanced elastic modulus up to 5.6 GPa – 7.0 GPa for compositions with 1% up to 30% wt. of kaolinite, in comparison to 5.4 GPa for neat PP at draw ratio 10. Moreover, for the composition with 10% wt. of kaolinite better drawability with maximum modulus was obtained in comparison to neat PP. Finally the most important observation made on polyolefin nanocomposites fibers were summarized in the Chapter VI. It can be concluded that polyolefin fibers nanocomposites were successfully prepared by two different processing conditions: melt compounding and melt spinning followed by hot drawing. In case of plates the introduction of nanosilica remarkably improved the thermal stability and elastic modulus, with retention of the pristine tensile properties at break. Nanocomposites fibers showed a higher improvement of the elastic modulus with respect to the nanocomposites plates containing the same percentage of nanofiller. Moreover, the introduction of the nanofiller enhanced tensile dynamic mechanical properties especially for higher draw ratio. Similar behavior was also observed in case of creep compliance. Higher creep stability was observed for the drawn fibers with nanofiller in comparison to neat polymer. This behavior could be a consequence of the different orientation and morphology related to the crystallinity developed in the spinning. These results confirmed that polyolefin containing nanofiller could be easily spun into nanofilled fiber. TEM images revealed how the experienced improvements of the mechanical properties could be probably related to the orientation of nanofiller aggregates along the strain direction and to the consequent increase of the filler-matrix interfacial area.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Books on the topic "Polyolefin"

1

Nwabunma, Domasius, and Thein Kyu, eds. Polyolefin Blends. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470199008.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Nwabunma, Domasius, and Thein Kyu, eds. Polyolefin Composites. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470199039.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Nwabunma, Domasius. Polyolefin blends. Hoboken, N.J: J. Wiley, 2007.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

Nwabunma, Domasius. Polyolefin composites. Hoboken, N.J: John Wiley & Sons, 2007.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
5

Soares, João B. P., and Timothy F. L. McKenna. Polyolefin Reaction Engineering. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2012. http://dx.doi.org/10.1002/9783527646944.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Advances in polyolefin nanocomposites. Boca Raton: CRC Press, 2011.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
7

Al-Ali AlMa'adeed, Mariam, and Igor Krupa, eds. Polyolefin Compounds and Materials. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-25982-6.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Ugbolue, S. C. O. Polyolefin fibres: Industrial and medical applications. Cambridge: Woodhead Publishing Ltd, 2009.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
9

E, McIntyre J., ed. Synthetic fibres: Nylon, polyester, acrylic, polyolefin. Cambridge: CRC/Woodhead Publishing Ltd., 2005.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
10

Abe, Akihiro, Hans-Henning Kausch, Martin Möller, and Harald Pasch, eds. Polymer Composites – Polyolefin Fractionation – Polymeric Peptidomimetics – Collagens. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-34330-8.

Full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Book chapters on the topic "Polyolefin"

1

Gooch, Jan W. "Polyolefin." In Encyclopedic Dictionary of Polymers, 568. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_9165.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Luyt, Adriaan S. "Polyolefin Blends." In Polyolefin Compounds and Materials, 107–56. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-25982-6_5.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Gooch, Jan W. "Thermoplastic Polyolefin." In Encyclopedic Dictionary of Polymers, 746. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_11798.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Gooch, Jan W. "Polyolefin Fiber." In Encyclopedic Dictionary of Polymers, 568. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_9166.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Gooch, Jan W. "Polyolefin Plastics." In Encyclopedic Dictionary of Polymers, 568. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_9167.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Gooch, Jan W. "Polyolefin Resins." In Encyclopedic Dictionary of Polymers, 568. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_9168.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

White, James L., and David D. Choi. "Polyolefin Copolymers and Blends." In Polyolefins, 107–20. München: Carl Hanser Verlag GmbH & Co. KG, 2004. http://dx.doi.org/10.3139/9783446413030.006.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

White, James L., and David D. Choi. "Polyolefin Copolymers and Blends." In Polyolefins, 107–20. München, Germany: Carl Hanser Verlag GmbH & Co. KG, 2005. http://dx.doi.org/10.1007/978-3-446-41303-0_6.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Bährle-Rapp, Marina. "C6–14 Polyolefin." In Springer Lexikon Kosmetik und Körperpflege, 132. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-71095-0_2495.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Popelka, Anton, Igor Novak, and Igor Krupa. "Polyolefin Adhesion Modifications." In Polyolefin Compounds and Materials, 201–30. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-25982-6_8.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Polyolefin"

1

St. Clair, David J. "Polyolefin Diol in Coatings for Thermoplastic Polyolefins." In International Congress & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1998. http://dx.doi.org/10.4271/980707.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Douglass, D. Mark, and Chung-Yuan Wu. "Laser welding of polyolefin elastomers to thermoplastic polyolefin." In ICALEO® 2003: 22nd International Congress on Laser Materials Processing and Laser Microfabrication. Laser Institute of America, 2003. http://dx.doi.org/10.2351/1.5060070.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Denison, Bruce R. "Advanced Polyolefin Bumper Systems." In International Congress & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1993. http://dx.doi.org/10.4271/930543.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Park, Chung P., Sandrine Burgun, Michel Brucker, and Suresh Subramonian. "Novel Acoustical Polyolefin Foams." In SAE 2001 Noise & Vibration Conference & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2001. http://dx.doi.org/10.4271/2001-01-1556.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Czop, Monika. "POLYOLEFIN WASTE TO ENERGY PROCESSES." In 15th International Multidisciplinary Scientific GeoConference SGEM2015. Stef92 Technology, 2011. http://dx.doi.org/10.5593/sgem2015/b51/s20.086.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Kamei, Sawako, Kazuo Igarashi, and Michael Wiseman. "Innovative Thermoplastic Polyolefin Paint Process." In SAE 2001 World Congress. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2001. http://dx.doi.org/10.4271/2001-01-0360.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Mapossa, António B., Walter W. Focke, Alcides Sitoe, and René Androsch. "Mosquito repellent microporous polyolefin strands." In FRACTURE AND DAMAGE MECHANICS: Theory, Simulation and Experiment. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0028432.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Bao, Wenbo, Miaojun Xu, He Jia, Hong Liu, and Bin Li. "Triazine macromolecule containing intumescent flame retardant polyolefin." In 2009 IEEE 9th International Conference on the Properties and Applications of Dielectric Materials (ICPADM 2009). IEEE, 2009. http://dx.doi.org/10.1109/icpadm.2009.5252290.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Peng, Jing, Peng Wei, and Zhi-qiang Liu. "Experiment and Analysis of Polyolefin Composite Insulator." In 2019 IEEE Sustainable Power and Energy Conference (iSPEC). IEEE, 2019. http://dx.doi.org/10.1109/ispec48194.2019.8975115.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Harjuntausta, Jarmo, and Mohana Murali Adhyatmabhattar. "Polyolefin Materials For Large Diameter Cooling Systems." In Abu Dhabi International Petroleum Conference and Exhibition. Society of Petroleum Engineers, 2012. http://dx.doi.org/10.2118/161842-ms.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Polyolefin"

1

Shewey, Megan, Patti Tibbenham, and Dan Houston. Carbon Fiber Reinforced Polyolefin Body Panels. Office of Scientific and Technical Information (OSTI), October 2019. http://dx.doi.org/10.2172/1600931.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Chung, T. C. Mike. Developing a New Polyolefin Precursor for Low-Cost, High-Strength Carbon Fiber. Office of Scientific and Technical Information (OSTI), May 2021. http://dx.doi.org/10.2172/1808293.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Ahn, Andrew. Selective Laser Sintering of Polyolefins. Office of Scientific and Technical Information (OSTI), March 2023. http://dx.doi.org/10.2172/1963608.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Wagener, Ken. Precision Morphology in Sulfonic, Phosphonic, Boronic, and Carboxylic Acid Polyolefins. Fort Belvoir, VA: Defense Technical Information Center, November 2013. http://dx.doi.org/10.21236/ada606523.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Barron, Andrew R. Tert-butylalumoxanes: Synthetic Analogs for Methylalumoxane (MAO) and New Catalytic Routes to Polyolefins and Polyketones. Fort Belvoir, VA: Defense Technical Information Center, June 1994. http://dx.doi.org/10.21236/ada280511.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Brüll, Robert, Hamza Mahmoud Aboelanin, Subrajeet Deshmukh, Tibor Macko, Jan-Hendrik Arndt, and Stepan Podzimek. Characterization of polyolefins using high-temperature size exclusion chromatography coupled with an infrared detector (HT-SEC-IR5). Peeref, December 2022. http://dx.doi.org/10.54985/peeref.2212p1310865.

Full text
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Polyolefin' for particular source types:
Journal articles Dissertations / Theses Books
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography