Bibliografias temáticas / Polyester

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Literatura científica selecionada sobre o tema "Polyester"

Autor: Grafiati

Publicado: 4 de junho de 2021

Última modificação: 25 de maio de 2024

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Artigos de revistas sobre o assunto "Polyester"

REHM, Bernd H. A. "Polyester synthases: natural catalysts for plastics". Biochemical Journal 376, n.º 1 (15 de novembro de 2003): 15–33. http://dx.doi.org/10.1042/bj20031254.

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Polyhydroxyalkanoates (PHAs) are biopolyesters composed of hydroxy fatty acids, which represent a complex class of storage polyesters. They are synthesized by a wide range of different Gram-positive and Gram-negative bacteria, as well as by some Archaea, and are deposited as insoluble cytoplasmic inclusions. Polyester synthases are the key enzymes of polyester biosynthesis and catalyse the conversion of (R)-hydroxyacyl-CoA thioesters to polyesters with the concomitant release of CoA. These soluble enzymes turn into amphipathic enzymes upon covalent catalysis of polyester-chain formation. A self-assembly process is initiated resulting in the formation of insoluble cytoplasmic inclusions with a phospholipid monolayer and covalently attached polyester synthases at the surface. Surface-attached polyester synthases show a marked increase in enzyme activity. These polyester synthases have only recently been biochemically characterized. An overview of these recent findings is provided. At present, 59 polyester synthase structural genes from 45 different bacteria have been cloned and the nucleotide sequences have been obtained. The multiple alignment of the primary structures of these polyester synthases show an overall identity of 8–96% with only eight strictly conserved amino acid residues. Polyester synthases can been assigned to four classes based on their substrate specificity and subunit composition. The current knowledge on the organization of the polyester synthase genes, and other genes encoding proteins related to PHA metabolism, is compiled. In addition, the primary structures of the 59 PHA synthases are aligned and analysed with respect to highly conserved amino acids, and biochemical features of polyester synthases are described. The proposed catalytic mechanism based on similarities to α/β-hydrolases and mutational analysis is discussed. Different threading algorithms suggest that polyester synthases belong to the α/β-hydrolase superfamily, with a conserved cysteine residue as catalytic nucleophile. This review provides a survey of the known biochemical features of these unique enzymes and their proposed catalytic mechanism.

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Motlatle, Abesach M., Suprakas Sinha Ray, Vincent Ojijo e Manfred R. Scriba. "Polyester-Based Coatings for Corrosion Protection". Polymers 14, n.º 16 (21 de agosto de 2022): 3413. http://dx.doi.org/10.3390/polym14163413.

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The article is the first review encompassing the study and the applications of polyester-based coatings for the corrosion protection of steel. The impact of corrosion and the challenges encountered thus far and the solutions encountered in industry are addressed. Then, the use of polyesters as a promising alternative to current methods, such as phosphating, chromating, galvanization, and inhibitors, are highlighted. The classifications of polyesters and the network structure determine the overall applications and performance of the polymer. The review provides new trends in green chemistry and smart and bio-based polyester-based coatings. Finally, the different applications of polyesters are covered; specifically, the use of polyesters in surface coatings and for other industrial uses is discussed.

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Lee, Hee Young, Heidy Cruz e Younggon Son. "Effects of incorporation of polyester on the electrical resistivity of polycarbonate/multi-walled carbon nanotube nanocomposite". Journal of Composite Materials 53, n.º 10 (24 de setembro de 2018): 1291–98. http://dx.doi.org/10.1177/0021998318801932.

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In this work, we present the effect of incorporation of polyester on the electrical properties of injection-molded polycarbonate/multi-walled carbon nanotube nanocomposites. The study was conducted by melt-mixing polycarbonate, multi-walled carbon nanotube, and three types of polyesters: polybutylene terephthalate, polyethylene terephthalate, and liquid crystal polymer. It was found that the volume resistivities of injection-molded composites containing 2 phr polyester significantly decreased because of the transesterification reaction between the polycarbonate and polyester. The resulting polycarbonate-polyester random block copolymer kept the conductive networks intact because of the preferential affinity of multi-walled carbon nanotubes with polyester. This study showed that incorporating polyester with polycarbonate–multi-walled carbon nanotube increases the electrical conductivity of injection-molded polycarbonate/multi-walled carbon nanotube nanocomposites to a great extent.

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Zhao, Yawei, e Wen Zhong. "Recent Progress in Advanced Polyester Elastomers for Tissue Engineering and Bioelectronics". Molecules 28, n.º 24 (9 de dezembro de 2023): 8025. http://dx.doi.org/10.3390/molecules28248025.

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Polyester elastomers are highly flexible and elastic materials that have demonstrated considerable potential in various biomedical applications including cardiac, vascular, neural, and bone tissue engineering and bioelectronics. Polyesters are desirable candidates for future commercial implants due to their biocompatibility, biodegradability, tunable mechanical properties, and facile synthesis and fabrication methods. The incorporation of bioactive components further improves the therapeutic effects of polyester elastomers in biomedical applications. In this review, novel structural modification methods that contribute to outstanding mechanical behaviors of polyester elastomers are discussed. Recent advances in the application of polyester elastomers in tissue engineering and bioelectronics are outlined and analyzed. A prospective of the future research and development on polyester elastomers is also provided.

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Liao, Chengzhu, Yuchao Li e Sie Chin Tjong. "Antibacterial Activities of Aliphatic Polyester Nanocomposites with Silver Nanoparticles and/or Graphene Oxide Sheets". Nanomaterials 9, n.º 8 (1 de agosto de 2019): 1102. http://dx.doi.org/10.3390/nano9081102.

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Aliphatic polyesters such as poly(lactic acid) (PLA), polycaprolactone (PCL) and poly(lactic-co-glycolic) acid (PLGA) copolymers have been widely used as biomaterials for tissue engineering applications including: bone fixation devices, bone scaffolds, and wound dressings in orthopedics. However, biodegradable aliphatic polyesters are prone to bacterial infections due to the lack of antibacterial moieties in their macromolecular chains. In this respect, silver nanoparticles (AgNPs), graphene oxide (GO) sheets and AgNPs-GO hybrids can be used as reinforcing nanofillers for aliphatic polyesters in forming antimicrobial nanocomposites. However, polymeric matrix materials immobilize nanofillers to a large extent so that they cannot penetrate bacterial membrane into cytoplasm as in the case of colloidal nanoparticles or nanosheets. Accordingly, loaded GO sheets of aliphatic polyester nanocomposites have lost their antibacterial functions such as nanoknife cutting, blanket wrapping and membrane phospholipid extraction. In contrast, AgNPs fillers of polyester nanocomposites can release silver ions for destroying bacterial cells. Thus, AgNPs fillers are more effective than loaded GO sheets of polyester nanocomposiites in inhibiting bacterial infections. Aliphatic polyester nanocomposites with AgNPs and AgNPs-GO fillers are effective to kill multi-drug resistant bacteria that cause medical device-related infections.

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Kausar, Ayesha. "Review of fundamentals and applications of polyester nanocomposites filled with carbonaceous nanofillers". Journal of Plastic Film & Sheeting 35, n.º 1 (20 de junho de 2018): 22–44. http://dx.doi.org/10.1177/8756087918783827.

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Polyester is a versatile commercially significant polymer (thermoplastic/thermoset) well-known for its biodegradability and excellent thermal, mechanical, and chemical properties. Synthetic aromatic polyester resins usually have better moisture resistance, nonflammability, liquid crystal, strength, thermal, and environmental features compared with natural/aliphatic polyesters. Nanofillers can reinforce these important polymers to further enhance the final nanocomposite structural and physical characteristics. This review presents research devoted to polyester nanocomposites with essential nanofillers such as; nanodiamond, fullerene, carbon nanotube, graphene, and graphene oxide. High-performance polyester/nanocomposites have been developed based on modified polyester design, nanofiller functionality, and optimized interaction between matrix and nanofiller. This article also presents state-of-the-art technological development in the field of polyester/nanocomposites predominantly in supercapacitors, fuel cells, shape memory materials, electromagnetic shielding materials, textiles, and biomedical appliances. Furthermore, future scenarios in scientific development of these nanocomposites are discussed.

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Morrow, Cary J. "Biocatalytic Synthesis of Polyesters Using Enzymes". MRS Bulletin 17, n.º 11 (novembro de 1992): 43–47. http://dx.doi.org/10.1557/s0883769400046650.

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Plants and animals have been exploited as sources of materials for centuries but, as our ability to analyze and fractionate them has progressed, the extraordinary range of properties available from materials produced by living systems has continued to grow. Doi, in another article in this issue of the MRS Bulletin, presents a discussion of a group of naturally occurring polyesters related to poly(beta-hydroxybutyrate). These polyesters are formed in vivo by several microorganisms as part of an energy storage scheme. Research on these systems has allowed growth conditions to be found that can lead, in a controlled fashion, to a number of copolymers. Useful materials based on these bacterial polyesters appear to be at hand.The in-vivo formation of polyesters in microorganisms also illustrates several of the important reasons for examining biocatalytic polymer synthesis. First, unlike most industrial syntheses of polyesters, the poly(beta-hydroxybutyrate) biosynthesis occurs at a near-ambient temperature using a carbohydrate feedstock. Second, and perhaps most importantly, the stored polyesters are readily biodegraded by the bacteria that manufacture them, so materials based on these polyesters should also be biodegradable. Third, although there are side chains along the polymer backbone, they are introduced in a highly stereo-specific fashion during in-vivo synthesis, leading to an entirely stereoregular polyester. However, along with these advantages, there are also significant limitations to bacterial polyester synthesis. First, there are some substrates that are not incorporated into the polyester by the bacteria. Second, normal metabolism leads to the polyester, always incorporating a fraction of hydroxybutyrate monomers. Third, the backbone is always comprised of four-atom, A-B type 3-hydroxy acid repeat units with variations appearing in the side chain at carbon-3.

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Yang, Seung-Cheol, e Jae Pil Kim. "Flame-retardant polyesters. II. Polyester polymers". Journal of Applied Polymer Science 106, n.º 2 (2007): 1274–80. http://dx.doi.org/10.1002/app.26544.

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Ma, Meng Meng, Lian Yuan Wang e Hai Yan Zhu. "Enzymatic Degradation of Polyester-Nanoparticles by Lipases and Adsorption of Lipases on the Polyester-Nanoparticles". Advanced Materials Research 418-420 (dezembro de 2011): 2302–7. http://dx.doi.org/10.4028/www.scientific.net/amr.418-420.2302.

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Enzymatic degradation tests of polymer in form of nanoparticle (NP) were used to study the biodegradation of two different types of polymers polytetramethylene adipitate (SP4/6) and polybutylene isophthalate (PBI) by two commercially available lipases. The two lipases, which are from the yeast Candida cylindracea (CcL) and Pseudomonas species (PsL) respectively, exhibited sufficient degradation activities both for the aliphatic model polyester SP4/6 and the aromatic model polyester PBI and the use of polyester NPs has dramatically shortened the duration of enzymatic degradation tests. It has also been noticed that the degradation percentage of the polyesters was in the range of 35-50%, probably due to the formation of low molecular weight intermediates that are not accessible to the enzymes. Since biodegradation of polymers is a surface process, the adsorption of lipases on the surface of polyester NPs may play an important role. In order to gain some insights into the adsorption process of enzymes on polymer NPs, the adsorption of CcL and PsL lipases on two hardly degradable polyesters polybutylene terephthalate (PBT) and polyethylene terephthalate (PET) was investigated in this work. The adsorption of lipases on these polyester NPs showed a fast kinetic. Langmuir isotherms were found to be generally suitable to describe the adsorption of lipases on polyester NPs, especially at low lipase concentration under the experimental conditions. However, significant derivations from Langmuir isotherms were observed at high lipase concentrations.

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Musshoff, H. "Dyeing and Printing Polyester and Polyester-Cellulosic Fabrics with Polyestren Dyes". Journal of the Society of Dyers and Colourists 77, n.º 3 (22 de outubro de 2008): 89–96. http://dx.doi.org/10.1111/j.1478-4408.1961.tb02427.x.

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Teses / dissertações sobre o assunto "Polyester"

Schmidt, Juliane, Ren Wei, Thorsten Oeser, e. Silva Lukas Andre Dedavid, Daniel Breite, Agnes Schulze e Wolfgang Zimmermann. "Degradation of Polyester Polyurethane by Bacterial Polyester Hydrolases". Universität Leipzig, 2017. https://ul.qucosa.de/id/qucosa%3A21100.

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Polyurethanes (PU) are widely used synthetic polymers. The growing amount of PU used industrially has resulted in a worldwide increase of plastic wastes. The related environmental pollution as well as the limited availability of the raw materials based on petrochemicals requires novel solutions for their efficient degradation and recycling. The degradation of the polyester PU Impranil DLN by the polyester hydrolases LC cutinase (LCC), TfCut2, Tcur1278 and Tcur0390 was analyzed using a turbidimetric assay. The highest hydrolysis rates were obtained with TfCut2 and Tcur0390. TfCut2 also showed a significantly higher substrate affinity for Impranil DLN than the other three enzymes, indicated by a higher adsorption constant K. Significant weight losses of the solid thermoplastic polyester PU (TPU) Elastollan B85A-10 and C85A-10 were detected as a result of the enzymatic degradation by all four polyester hydrolases. Within a reaction time of 200 h at 70 °C, LCC caused weight losses of up to 4.9% and 4.1% of Elastollan B85A-10 and C85A-10, respectively. Gel permeation chromatography confirmed a preferential degradation of the larger polymer chains. Scanning electron microscopy revealed cracks at the surface of the TPU cubes as a result of enzymatic surface erosion. Analysis by Fourier transform infrared spectroscopy indicated that the observed weight losses were a result of the cleavage of ester bonds of the polyester TPU.

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Wen, Yahui. "Graphene-based thermosetting polymer nanocomposites : unsaturated polyester and hyperbranched polyester". Thesis, University of Sheffield, 2018. http://etheses.whiterose.ac.uk/20921/.

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Skurat, Harris Heidi A. "Buried in polyester". Virtual Press, 2007. http://liblink.bsu.edu/uhtbin/catkey/1371477.

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Buried in Polyester is a collection of essays in three parts loosely connected around the theme of the loss of my mother. Much like JoAnn Beard's The Boys of My My Youth, the essays hold up pieces of my life for inspection and puts them down again, not always with a sense of resolution. The subtext of the piece revolves around the search to put together the pieces of what my life was before and after my mother, and the transition from girlhood to adulthood with the absence of my mother. I hope also to explore how the self splits after a traumatic death, and the desperate attempt at recreation that takes the place of genuine mourning. The final three pieces are a trilogy exploring my father's deteriorating health and my attempts to connect with him while somehow recapturing the self that I lost.
Department of English

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Marten, Elke. "Korrelationen zwischen der Struktur und der enzymatischen Hydrolyse von Polyestern". [S.l. : s.n.], 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=959804153.

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Islam, Nazirul. "Fundamental investigations on the barrier effect of polyester micro fiber fabrics towards particle loaded liquids induced by surface hydrophobization". [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=973470941.

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Abou, Zeid Dunja Manal. "Anaerobic biodegradation of natural and synthetic polyesters (Anaerober Bioabbau von natürlichen und synthetischen Polyestern) /". [S.l. : s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=96282593X.

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Kiefer, Laura A. "Synthesis and characterizaton of novel polyester/polysiloxane and polyester/arylphosphine oxide copolymers". Diss., This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-07122007-103944/.

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Plikk, Peter. "Porous degradable polyester scaffolds /". Stockholm : Royal Institute of Technology, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3960.

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Coleshill, Anita. "Synthesis of polyester dendrimers". Thesis, University of Warwick, 1998. http://wrap.warwick.ac.uk/55728/.

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Dendrimers are a fairly new class of macromolecule. They have many potential uses including use in surface coatings and as host molecules. There are two main methods available for constructing dendrimers, the convergent approach and the divergent approach. In this thesis dendrimers were synthesised using the divergent approach. In chapter one our original aim was to synthesise dendrimers based on bicine, but there were complications involved in synthesis and storage of the monomer. However, it was possible to make a iminium salt using bicine as the starting material, which was reacted with various nucleophiles. With 2,2-bishydroxymethylpropionic acid it was possible to produce a generation one protected dendrimer, but deprotection could not be achieved. In the third chapter the syntheses of dendrimers based on 4,4-bis(4- hydroxyphenyl)valeric acid are described. Dendrimers were successfully synthesised up to and including generation two. These were made using various esterification methods. Chapter four describes the synthesis of functionalised dendrimers. Generation one deprotected dendrimers were reacted with a variety of reagents to produce pent-4-enoyl, urethane and lineoyl functionalised dendrimers. Chapter five describes the analysis of dendrimers using MALDI-MS. For every dendrimer synthesis molecular weights were obtained well within the boundaries of experimental error. It was also shown how preparation time and laser power can affect the spectra obtained.

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Pierce, Benjamin Franklin Ashby Valerie. "Thermally-responsive polyester urethanes". Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2008. http://dc.lib.unc.edu/u?/etd,1982.

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Thesis (Ph. D.)--University of North Carolina at Chapel Hill, 2008.
Title from electronic title page (viewed Dec. 11, 2008). "... in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Department of Chemistry." Discipline: Chemistry; Department/School: Chemistry.

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Mais fontes

Livros sobre o assunto "Polyester"

David, Brunnschweiler, Hearle J. W. S, Aoki Akira 1919- e Textile Institute (Manchester England), eds. Tomorrow's ideas & profits: Polyester : 50 years of achievement. Manchester, England: Textile Institute, 1993.

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Muthu, Subramanian Senthilkannan, ed. Recycled Polyester. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-32-9559-9.

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Colours, ICI, ed. Polyester microfibres. Manchester: ICI Colours, 1991.

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Ju zhi he cheng ji ying yong ji shu jin zhan. Beijing Shi: Zhongguo shi hua chu ban she, 2009.

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Ju zhi he cheng ji ying yong ji shu jin zhan. Beijing Shi: Zhongguo shi hua chu ban she, 2009.

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Pickard, Wayland. Polyester: The musical. New York, NY: Samuel French, 2010.

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Little, Jean. The polyester grandpa. New York: Holiday House, 1998.

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Jiří, Militký, ed. Modified polyester fibres. Amsterdam: New York, 1991.

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Phil, Olson, ed. Polyester: The musical. New York, NY: Samuel French, 2010.

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Tyagi, Rajendra. Khadi mein polyester. [S.l.]: [s.n.], 2004.

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Capítulos de livros sobre o assunto "Polyester"

Burkinshaw, S. M. "Polyester". In Chemical Principles of Synthetic Fibre Dyeing, 1–76. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0593-4_1.

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Gooch, Jan W. "Polyester". In Encyclopedic Dictionary of Polymers, 557. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_9037.

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Baker, Ian. "Polyester". In Fifty Materials That Make the World, 157–61. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-78766-4_30.

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Olatunji, Ololade. "Polyester". In Aquatische Biopolymere, 375–93. Cham: Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-48282-3_15.

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Veit, Dieter. "Polyester". In Fibers, 625–48. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-15309-9_30.

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Veit, Dieter. "Polyester". In Fasern, 655–80. Berlin, Heidelberg: Springer Berlin Heidelberg, 2023. http://dx.doi.org/10.1007/978-3-662-64469-0_30.

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Noor Hidayah Mustapha, Siti, e Rohani Mustapha. "Hybrid Polyester and Bio-Polyester Composites". In Polyester-Based Biocomposites, 201–13. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9781003270980-11.

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Utracki, L. A. "Polyester blends". In Commercial Polymer Blends, 337–83. Boston, MA: Springer US, 1998. http://dx.doi.org/10.1007/978-1-4615-5789-0_17.

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Gooch, Jan W. "Chlorendic Polyester". In Encyclopedic Dictionary of Polymers, 139. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_2305.

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Gooch, Jan W. "Chlorostyrenated Polyester". In Encyclopedic Dictionary of Polymers, 141. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_2335.

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Trabalhos de conferências sobre o assunto "Polyester"

Wei, X., J. R. Mallon, L. F. Correa, M. R. Dorfman e F. Ghasripoor. "Microstructure and Property Control of CoNiCrAlY Based Abradable Coatings for Optimal Performance". In ITSC 2000, editado por Christopher C. Berndt. ASM International, 2000. http://dx.doi.org/10.31399/asm.cp.itsc2000p0407.

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Abstract A CoNiCrAlY-hBN/Polyester material has recently been developed for clearance control applications in gas turbine compressors that use titanium alloy blades. While engine tests serve as the final evaluation of the coating performance, quality assurance laboratories and production shops would rely upon the more readily available coating hardness values to predict performance. This paper will focus on the reproducibility of coating macrohardness with a plasma spray process. It is shown that plasma spray parameters affect the hardness of CoNiCrAlY-hBN/Polyester coatings by changing the level of polyesters retained in the coating and the volume percentage of metallic matrix. The correlation between hardness, retained polyester level and microstructure of these coatings is captured in a coating hardness map from which desired microstructure and polyester entrapment are determined. Based on the understanding of the correlation between coating hardness and microstructural features, the use of additional criteria other than hardness such as retained polyester level and non-metallic portion of the coating is recommended in order to assure the quality of the coating more effectively.

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Bastiurea, M. S., M. Bastiurea, G. Andrei, M. Murarescu e D. Dumitru. "Dynamic mechanical properties for polyester/microcellulose and polyester/nanocellulose". In 2015 IEEE 15th International Conference on Nanotechnology (IEEE-NANO). IEEE, 2015. http://dx.doi.org/10.1109/nano.2015.7388991.

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Agarwal, Apoorva, Manoj Datta, G. V. Ramana e Narendra Kumar Soni. "Comparison of Pullout Behaviour of Polyester Geogrid and Polyester Strip Soil Reinforcement". In Geo-Congress 2022. Reston, VA: American Society of Civil Engineers, 2022. http://dx.doi.org/10.1061/9780784484012.049.

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Davies, Peter, Patrice Baron, Karine Salomon, Charles Bideaud, J. P. Labbe´, Ste´phane Toumit, Michel Francois, Francois Grosjean, Tony Bunsell e A. G. Moysan. "Influence of Fibre Stiffness on Deepwater Mooring Line Response". In ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/omae2008-57147.

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Polyester fibre ropes are now an accepted solution for deepwater mooring of production platforms and a single high tenacity fibre grade is widely used. Few studies of other fibres have been reported but polyesters can be produced with a range of properties by varying drawing parameters, and other stiffer fibres are also available. This paper presents a study of these alternative fibre rope solutions, performed within the French Mooring Line project. First, in order to obtain the input data necessary for mooring line analyses an extensive test program was performed to characterize polyester, improved polyester, PEN, LCP, aramid and HMPE fibre ropes from yarns up to 800 ton break load ropes. Tests at different scales have allowed property transfer to be quantified. Rope modelling has been used in parallel to examine the influence of material and structural parameters. Then, using these data, a series of analyses was run by engineering contractors, which quantified the benefits of higher stiffness for different supports (semi-submersible, production platform and offloading buoy) down to 2500 meter depth. Under certain conditions the stiffer ropes can result in significantly reduced rope diameter and weight.

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Beatriz Aires de Freitas, Fernanda, Nilson Francisco da Silva, Ana Batista e Daniel Freitas Freire Martins. "Analysis of the mechanical properties: Polyester composites versus polyester with aquatic macrophyte ashes". In 27^th Brazilian Congress of Thermal Sciences and Engineering. ABCM, 2023. http://dx.doi.org/10.26678/abcm.cobem2023.cob2023-0717.

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Kargarzadeh, Hanieh, Andrzej Galeski e Ishak Ahmad. "Rubber toughened polyester cellulose nanocomposites". In 9TH INTERNATIONAL CONFERENCE ON “TIMES OF POLYMERS AND COMPOSITES”: From Aerospace to Nanotechnology. Author(s), 2018. http://dx.doi.org/10.1063/1.5045941.

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Franc¸ois, Michel, e Peter Davies. "Characterization of Polyester Mooring Lines". In ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/omae2008-57136.

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Fibre ropes are extensively used in marine applications. One critical area of interest is their application as mooring lines for floating offshore platforms, for which primarily polyester is now employed in various regions (offshore Brazil - now for 10 years, West Africa, Gulf of Mexico). Evaluating the response of the system requires a description of the load-elongation properties of the rope. A practical model involving two sets of stiffness data is currently used, and procedures for their measurement are available. This paper presents an overview of this model, then focuses on recent work on the quasi-static stiffness of polyester ropes. This is addressing the variations of the mean tension in the lines, at a very slow rate, under changing weather conditions. Extensive tests were performed, principally on polyester sub-rope samples. Some tests were also performed on a full size 800-ton MBS rope. Besides standard tests, specific tests were performed over an extended range of loading, to cover the situations that may be found in a wide range of systems and design conditions. The factors (measurement accuracy, test conditions, etc...) affecting the values are discussed along with the presentation of tests and results. Results are interpreted to provide practical data for mooring analysis, in the form of a quasi-static load-elongation characteristic. These results also give a better insight into the visco-elasto-plastic response of polyester fibre ropes. For the dynamic stiffness of polyester ropes, an overview of recent and earlier test data is presented. The dependence of dynamic stiffness on testing parameters is discussed, highlighting mean load as the principal parameter under real stochastic loading, and confirming the current practice for modelling dynamic stiffness in design.

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Kim, Minsuk, Yu Ding e Jun Zhang. "Numerical Simulation of a Spar Interacting With a Polyester Mooring System". In ASME 2004 23rd International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2004. http://dx.doi.org/10.1115/omae2004-51222.

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A numerical scheme, known as CABLE3D, originally developed for the simulation of dynamics of steel mooring lines is extended to allow for special properties pertaining to polyester ropes, such as relatively large elongation under tension, dependence of the modulus on loads, and energy dissipation under cyclic loads. The modified CABLE3D is then integrated into a numerical package, known as COUPLE6D, for computing the interaction between a floating structure and its polyester mooring system. A classical SPAR is chosen in this study as a representative of deepwater floating structures. By considering large elongation in polyester ropes, the static offset curve of a polyester mooring system is softer than that calculated under the assumption of small elongation. The effects of the mean loads on the modulus of polyester ropes are much greater than those of the dynamic loads. The energy dissipation in polyester ropes under cyclic loading does not play a significant role in the responses of the SPAR and tensions in a polyester mooring system. The above observations though made based on a classical SPAR may still have important implications to other floating structures moored by a polyester mooring system.

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Xu, Lixin, e Jieyan Chen. "Advantages of Polyester Mooring for Deepwater Floaters". In ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-23976.

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Since first installed at a water depth of 4,660 feet in 1997, polyester mooring systems have now been used on floating platforms in the Gulf of Mexico (GOM), Brazil and other regions. The Mad Dog Spar was the first floating production system (FPS) with permanent deepwater polyester moorings in the GOM. After the Mad Dog Spar, the deepest water depth is 7,800 feet in which a polyester mooring system was installed on the Perdido Spar. The polyester mooring systems have performed favorably, e.g., in the GOM, experiencing hurricanes without incident. The polyester rope in general is more advantageous than steel wire in deeper water due to reduced weight (and tension), high strength, durability (better fatigue and no corrosion), and improved floater global performances (less offset, etc.). Moreover, while a floating production platform is designed to support riser systems, fatigue damage of risers due to Vortex Induced Motions (VIM) of the platform are important design drivers particularly in the GOM. The polyester mooring system has a higher restoring force in horizontal (thus a higher lateral stiffness) in currents resulting in a significantly better fatigue performance (less current bins with VIM lock-in) than the steel mooring system does. The paper herein presents a comparative study with two kinds of mooring systems (polyester ropes and steel wires) for the same platform. Differences between the polyester and steel mooring systems are evaluated for various aspects, such as the mooring system configuration and performance, installation risks, operations, and impact on hull and riser system design and performance. The results also indicate cost savings for the polyester mooring equipment and the overall production system.

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Yousif, B. F., K. J. Wong e N. S. M. El-Tayeb. "An Investigation on Tensile, Compression and Flexural Properties of Natural Fibre Reinforced Polyester Composites". In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-44012.

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In the present work, effects of two types of natural fibres on mechanical properties of polyester composites were investigated at different volume fractions of fibre. Tensile, compression, and flexural properties of oil palm bunch and oil palm fruit fibres reinforced polyester composites were investigated. Additionally, tensile strength of the selected composites was calculated theoretically. Scanning electron microscope was used to observe the fracture mechanism of the specimens. Single fiber pull-out tests were carried out to determine the interfacial shear strength between polyester resin and both types of oil palm fibre. As results, it was found that both types of oil palm fibre enhanced the mechanical performance of polyester composites. At higher volume fraction (≈41%), tensile strength was improved, when polyester reinforced with oil palm fruit fibres, i.e. 2.5 folds improvement in the tensile strength value. Further, experimental tensile strength values of oil palm bunch/polyester composites was found to be less varied compared to theoretical results. Flexural strength of polyester was worsened with oil palm fibres at all of fibre volume fraction.

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Relatórios de organizações sobre o assunto "Polyester"

Kunc, Vlastimil, John R. Ilkka, Steven L. Voeks e John M. Lindahl. Vinylester and Polyester 3D Printing. Office of Scientific and Technical Information (OSTI), novembro de 2018. http://dx.doi.org/10.2172/1490578.

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Kunc, Vlastimil, Christopher Hershey, John Lindahl, Stian Romberg, Steven L. Voeks e Mark Adams. Vinylester and Polyester 3D Printing. Office of Scientific and Technical Information (OSTI), dezembro de 2019. http://dx.doi.org/10.2172/1606801.

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Abdul-Bari, Mohammed, e Rachel McQueen. Comparison of Odor Intensity between Nylon and Polyester. Ames: Iowa State University, Digital Repository, novembro de 2016. http://dx.doi.org/10.31274/itaa_proceedings-180814-1575.

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McGrath, James E. Aromatic Polyester-Polysiloxane Block Copolymers: Multiphase Transparent Damping Materials. Fort Belvoir, VA: Defense Technical Information Center, outubro de 1986. http://dx.doi.org/10.21236/ada182623.

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Biyani, R. K., e D. W. Hendrickson. Test procedures for polyester immobilized salt-containing surrogate mixed wastes. Office of Scientific and Technical Information (OSTI), julho de 1997. http://dx.doi.org/10.2172/325400.

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Todd, R. J., D. Pate e K. M. Welch. Outgassing Rate of Reemay Spunbonded Polyester and Dupont Double Aluminized Mylar. Office of Scientific and Technical Information (OSTI), setembro de 1992. http://dx.doi.org/10.2172/1119168.

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Guess, T. R., E. D. Jr Reedy e M. E. Stavig. Characterization of E-glass/polyester woven fabric composite laminates and tubes. Office of Scientific and Technical Information (OSTI), dezembro de 1995. http://dx.doi.org/10.2172/203488.

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Todd, R. J., D. Pate e K. M. Welch. Outgassing rate of Reemay Spunbonded Polyester and DuPont Double Aluminized Mylar. Office of Scientific and Technical Information (OSTI), agosto de 1993. http://dx.doi.org/10.2172/10181206.

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Smith, L. E., D. W. Brown e R. E. Lowry. Prediction of the long term stability of polyester-based recording media. Gaithersburg, MD: National Bureau of Standards, 1986. http://dx.doi.org/10.6028/nbs.ir.86-3474.

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ช่วยจุลจิตร์, เสาวรจน์, e อมร เพชรสม. การสังเคราะห์พอลิเอสเตอร์เรซินชนิดไม่อิ่มตัวจากขวดเพทที่ใช้แล้ว : รายงานผลการวิจัย (Synthesis of unsaturated polyester resin from PET waste bottles). จุฬาลงกรณ์มหาวิทยาลัย, 1994. http://dx.doi.org/10.58837/chula.res.1994.1.

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ขวดเพทที่ใช้แล้ว สามารถนำกลับมารีไซเคิล ด้วยการย่อยสลายทางเคมีโดยการไกลโคไลซ์ในไกลคอลปริมาณมากเกินพอ เช่น เอทิลีนไกลคอล, โพรพิลีนไกลคอล และไดเอทิลีนไกลคอล โดยมีซิงก์อะซีเตตเป็นตัวเร่งปฏิกิริยา ที่อุณหภูมิ 190 องศาเซลเซียสเป็นเวลา 8 ชั่วโมง ภายใต้บรรยากาศของก๊าซไนโตรเจน ผลที่ได้จากปฏิกิริยา ส่วนใหญ่จะเป็นบิสไฮดรอกซีเอทิล เทเรฟธาเลท (BHET) ซึ่งเป็นโมโนเมอร์ของเพท และเมื่อนำผลที่ได้นี้ ไปทำปฏิกิริยากับมาเลอิกแอนไฮไดรด์ และผสมกับสไตรีนโมโนเมอร์จะได้พอลิเอสเตอร์เรซินชนิดไม่อิ่มตัว ซึ่งสามารถทำให้แข็งตัว โดยการใช้เมทิลเอทิลคีโตนเปอร์ออกไซด์ (MEKPO) เป็นตัวเริ่มต้นปฏิกิริยา และโคบอลต์ออกโตเอตเป็นตัวเร่งปฏิกิริยา เมื่อเปรียบเทียบสมบัติทางกายภาพและสมบัติเชิงกล ระหว่างพอลิเอสเตอร์เรซินที่สังเคราะห์ได้จากขวดเพทที่ใช้แล้ว กับพอลิเอสเตอร์เรซินที่ใช้งานกันอยู่ทั่วไ ป พบว่าสมบัติด้านความแข็ง ความทนการดัดโค้ง และจุดอ่อนตัวของเรซินที่สังเคราะห์ได้จะสูงกว่าเรซินที่ใช้กันอยู่ทั่วไป เรซินที่ได้จากขวดเพทที่ใช้แล้ว จึงสามารถนำไปขึ้นรูปเป็นผลิตภัณฑ์ต่างๆ ได้ด้วยกรรมวิธีการหล่อ เช่นเดียวกับพอลิเอสเตอร์เรซินทั่วไป นอกจากนี้ ยังใช้ทำผลิตภัณฑ์ไฟเบอร์กลาส และหินอ่อนเทียม ได้อีกด้วย

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