Journal articles: 'Layered silicate'

1

Khachatryan, L. A. "Disperse Layered Silicates in Magnesium Silicate Rocks." Glass Physics and Chemistry 30, no. 1 (January 2004): 67–72. http://dx.doi.org/10.1023/b:gpac.0000016400.42044.5b.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Cheaburu, Catalina Natalia, Cornelia Vasile, Donatella Duraccio, and Sossio Cimmino. "Characterisation of the Chitosan/Layered Silicate Nanocomposites." Solid State Phenomena 151 (April 2009): 123–28. http://dx.doi.org/10.4028/www.scientific.net/ssp.151.123.

Full text

Abstract:

Characterization of chitosan / layered silicate nanocomposites obtained by solution-mixing technique, having different compositions including treated and untreated montmorilonite (MMT) has been performed. The optimum amount of MMT and also the effect of nanoparticles type on nanocomposite properties by DSC, X-ray diffraction and TG measurements have been established. The chitosan chains were inserted into silicate layers to form the intercalated nanocomposites. The interlayer distance of the silicates in the nanocomposites enlarged as their amount increased. The stiffness and thermal stability enhanced.

APA, Harvard, Vancouver, ISO, and other styles

3

JIA, FEIFEI, and SHAOXIAN SONG. "EXFOLIATION AND CHARACTERIZATION OF LAYERED SILICATE MINERALS: A REVIEW." Surface Review and Letters 21, no. 02 (April 2014): 1430001. http://dx.doi.org/10.1142/s0218625x14300019.

Full text

Abstract:

Exfoliated silicate minerals have attracted great attentions because of the dramatic improvement in properties. This paper highlights the preparation of exfoliated silicate minerals, including physical, chemical, mixed physical and chemical methods. The mechanisms by which silicates are exfoliated and the important influential factors are also summarized. Finally, the instrumental techniques to characterize the exfoliated structure and exfoliation degree are presented.

APA, Harvard, Vancouver, ISO, and other styles

4

Chen, Chenggang, Mohammad Khobaib, and David Curliss. "Epoxy layered-silicate nanocomposites." Progress in Organic Coatings 47, no. 3-4 (September 2003): 376–83. http://dx.doi.org/10.1016/s0300-9440(03)00130-9.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Zanetti, Marco, Sergei Lomakin, and Giovanni Camino. "Polymer layered silicate nanocomposites." Macromolecular Materials and Engineering 279, no. 1 (June 1, 2000): 1–9. http://dx.doi.org/10.1002/1439-2054(20000601)279:1<1::aid-mame1>3.0.co;2-q.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Giannelis, Emmanuel P. "Polymer Layered Silicate Nanocomposites." Advanced Materials 8, no. 1 (January 1996): 29–35. http://dx.doi.org/10.1002/adma.19960080104.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Jia, Meng, Zengping Zhang, Long Wei, Jiange Li, Dongdong Yuan, Xingjiao Wu, and Zhiyong Mao. "High- and Low-Temperature Properties of Layered Silicate-Modified Bitumens: View from the Nature of Pristine Layered Silicate." Applied Sciences 9, no. 17 (August 31, 2019): 3563. http://dx.doi.org/10.3390/app9173563.

Full text

Abstract:

Layered silicates, as bitumen modifiers, have received increasing attention. The main objective of this study was to evaluate the influence of layered silicates on bitumen properties. For this study, montmorillonite (MMT), rectorite (REC), organic montmorillonite (OMMT), and organic rectorite (OREC) were selected. The layered structure type of layered silicates was characterized by SEM (scanning electron microscope) and XRD (X-ray diffraction diffractometer). Tests for determining high-temperature properties included viscosity, DSR (dynamic shear rheometer), and TG (thermogravimetry) tests, and studies for determining the low-temperature properties were conducted by BBR (bending beam rheometer) and DSC (differential scanning calorimetry) tests. Our results show that MMT, REC, OMMT, and OREC were all intercalated structures. OREC had the largest d001 interlayer space, followed by REC, OMMT, and MMT. OREC improved the high-temperature property of virgin bitumen more effectively than OMMT. Meanwhile, REC-modified bitumen exhibited a high-temperature property similar to OMMT-modified bitumen. When compared with REC and OREC, MMT and OMMT were less efficient in reducing the low-temperature properties of virgin bitumen, and OMMT was the least efficient. Therefore, it can be concluded that the nature of pristine layered silicates has a great impact on the high- and low-temperature properties of bitumen. Moreover, organic treatment can simultaneously improve the high- and low-temperature properties of layered silicate-modified bitumens.

APA, Harvard, Vancouver, ISO, and other styles

8

Čeklovský, Alexander, Adriana Czímerová, Kamil Lang, and Juraj Bujdák. "Layered silicate films with photochemically active porphyrin cations." Pure and Applied Chemistry 81, no. 8 (June 30, 2009): 1385–96. http://dx.doi.org/10.1351/pac-con-08-08-35.

Full text

Abstract:

The objective of this study was to prepare and characterize hybrid films based on layered silicates with a tetracationic porphyrin dye 5,10,15,20-tetrakis(N-methylpyridinium-4-yl)porphyrin (TMPyP) intercalated in the inorganic matrix. The properties of the TMPyP cations in the materials were compared with those of other systems (solutions, colloids) characterized mainly by absorption and fluorescence spectroscopies. Linearly polarized absorption spectroscopy, X-ray diffraction (XRD), and fluorescence microscopy were used as well. Using appropriate layered silicate templates, applying the premodification of the inorganic component with hydrophobic alkylammonium surfactants and selecting an appropriate method, one can prepare the materials of broadly variable spectral properties of the dye. The spectral variation takes place while preserving the photochemical activity of TMPyP. The interpretations of spectral changes are based on the structural changes of the TMPyP molecules adsorbed on layered silicate surface related to the flattening of cationic pyridinium substituents.

APA, Harvard, Vancouver, ISO, and other styles

9

Kim, G. M., S. Goerlitz, and G. H. Michler. "Deformation mechanism of nylon 6/layered silicate nanocomposites: Role of the layered silicate." Journal of Applied Polymer Science 105, no. 1 (2007): 38–48. http://dx.doi.org/10.1002/app.26067.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Ko, Younghee, Myung Hun Kim, Sun Jin Kim, and Young Sun Uh. "Synthesis of Co-silicalite-1 from a layered silicate." Korean Journal of Chemical Engineering 18, no. 3 (May 2001): 392–95. http://dx.doi.org/10.1007/bf02699184.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Messersmith, Phillip B., and Emmanuel P. Giannelis. "Polymer-layered silicate nanocomposites: in situ intercalative polymerization of .epsilon.-caprolactone in layered silicates." Chemistry of Materials 5, no. 8 (August 1993): 1064–66. http://dx.doi.org/10.1021/cm00032a005.

Full text

APA, Harvard, Vancouver, ISO, and other styles

12

Okamoto, M. "Polymer/Layered Silicate Nano-composites." International Polymer Processing 21, no. 5 (November 2006): 487–96. http://dx.doi.org/10.3139/217.0012.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

Ananias, Duarte, Stanislav Ferdov, Filipe A. Almeida Paz, Rute A. Sá Ferreira, Artur Ferreira, Carlos F. G. C. Geraldes, Luís D. Carlos, Zhi Lin, and João Rocha. "Photoluminescent Layered Lanthanide Silicate Nanoparticles." Chemistry of Materials 20, no. 1 (January 2008): 205–12. http://dx.doi.org/10.1021/cm702524n.

Full text

APA, Harvard, Vancouver, ISO, and other styles

14

Plummer, Christopher J. G., László Garamszegi, Yves Leterrier, Marlene Rodlert, and Jan-Anders E. Månson. "Hyperbranched Polymer Layered Silicate Nanocomposites." Chemistry of Materials 14, no. 2 (February 2002): 486–88. http://dx.doi.org/10.1021/cm011229w.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Dębowska, M., J. Rudzińska-Girulska, J. Pigłowski, and J. Dołęga. "Polyamide 6/Layered Silicate Nanocomposites." Acta Physica Polonica A 113, no. 5 (May 2008): 1321–29. http://dx.doi.org/10.12693/aphyspola.113.1321.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Ganter, Markus, Wolfram Gronski, Peter Reichert, and Rolf Mülhaupt. "Rubber Nanocomposites: Morphology and Mechanical Properties of BR and SBR Vulcanizates Reinforced by Organophilic Layered Silicates." Rubber Chemistry and Technology 74, no. 2 (May 1, 2001): 221–35. http://dx.doi.org/10.5254/1.3544946.

Full text

Abstract:

Abstract Rubber compounds based on butadiene rubber (BR) or styrene—butadiene rubber (SBR) containing organophilic layered silicates were prepared. Organophilic silicates were swollen in a rubber/toluene solution. Matrix—filler reactive bonding was performed by adding bis(triethoxysilylpropyl)-tetrasulfan (TESPT) during swelling. Excellent dispersion of organoclay nanofillers in rubber matrices was demonstrated by transmission electron microscopy (TEM) and atomic force microscopy (AFM) exhibiting intercalated and partially exfoliated silicate layers. Matrix—filler interfacial coupling by TESPT led to reduced strain at break and reduced hysteresis for both organoclay and silica-based vulcanizates as expected for successful matrix filler coupling. Organoclay vulcanizates exhibited enhanced hysteresis when compared to silica compounds. This is related to orientation and sliding of anisotropic silicate layers, as determined by online wide-angle X-ray scattering (WAXS) measurements during cyclic tensile testing.

APA, Harvard, Vancouver, ISO, and other styles

17

Brouwer, Darren Henry, Sylvian Cadars, Kathryn Hotke, Jared Van Huizen, and Nicholas Van Huizen. "Structure determination of a partially ordered layered silicate material with an NMR crystallography approach." Acta Crystallographica Section C Structural Chemistry 73, no. 3 (February 6, 2017): 184–90. http://dx.doi.org/10.1107/s2053229616019550.

Full text

Abstract:

Structure determination of layered materials can present challenges for conventional diffraction methods due to the fact that such materials often lack full three-dimensional periodicity since adjacent layers may not stack in an orderly and regular fashion. In such cases, NMR crystallography strategies involving a combination of solid-state NMR spectroscopy, powder X-ray diffraction, and computational chemistry methods can often reveal structural details that cannot be acquired from diffraction alone. We present here the structure determination of a surfactant-templated layered silicate material that lacks full three-dimensional crystallinity using such an NMR crystallography approach. Through a combination of powder X-ray diffraction and advanced 29Si solid-state NMR spectroscopy, it is revealed that the structure of the silicate layer of this layered silicate material templated with cetyltrimethylammonium surfactant cations is isostructural with the silicate layer of a previously reported material referred to as ilerite, octosilicate, or RUB-18. High-field 1H NMR spectroscopy reveals differences between the materials in terms of the ordering of silanol groups on the surfaces of the layers, as well as the contents of the inter-layer space.

APA, Harvard, Vancouver, ISO, and other styles

18

Heckmann, W., F. Ramsteiner, and Ch Mehler. "Morphology of Poly Amide Nanocomposites Characterized by Transmission Electron Microscopy (TEM) and Electron Spectroscopic Imaging (ESI)." Microscopy and Microanalysis 7, S2 (August 2001): 502–3. http://dx.doi.org/10.1017/s1431927600028580.

Full text

Abstract:

The introduction of organophilic layered silicates into a polyamide matrix significantly improves stiffness and strength [1,2]. Two methods are known to prepare such nanocomposites. For both methods cations such as sodium, potassium, magnesium or calcium, located in the interlayer galleries of the layered silicates must be exchanged by quaternary alkyl ammonium ions containing at least one alkyl chain and so rendering the originally hydrophilic into an organophilic silicate. in the insitu-method monomeric caprolactam is intercalated between the modified silicate interlayers and subsequently polycondensated to polyamide. By this method the silicates can be broken down into their nanoscale building blocks as can be shown by TEM and ESI (Fig. 1). Another more direct possibility to delaminate the silicates is melt mixing in an extruder. with both methods similar degrees of delamination can be achieved.This paper presents some of our morphological results on polyamide containing organically modified montmorillonite.

APA, Harvard, Vancouver, ISO, and other styles

19

Schmidt, Daniel F., and Emmanuel P. Giannelis. "Silicate Dispersion and Mechanical Reinforcement in Polysiloxane/Layered Silicate Nanocomposites." Chemistry of Materials 22, no. 1 (January 12, 2010): 167–74. http://dx.doi.org/10.1021/cm9026978.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Khachatryan, Lida A., and Naira B. Yeritsyan. "Ultra Fine Layered Silicate Synthesis from Synthetic Silicate Raw Material." Composite Interfaces 17, no. 5-7 (January 2010): 595–601. http://dx.doi.org/10.1163/092764410x513459.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Schwieger, W., P. Werner, and K. H. Bergk. "A new synthetic layered silicate of type metal silicate hydrate." Colloid & Polymer Science 269, no. 10 (October 1991): 1071–73. http://dx.doi.org/10.1007/bf00657439.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Mittal, Vikas. "Polymer Layered Silicate Nanocomposites: A Review." Materials 2, no. 3 (August 20, 2009): 992–1057. http://dx.doi.org/10.3390/ma2030992.

Full text

APA, Harvard, Vancouver, ISO, and other styles

23

Drummy, Lawrence F., Sharon E. Jones, Ras B. Pandey, B. L. Farmer, Richard A. Vaia, and Rajesh R. Naik. "Bioassembled Layered Silicate-Metal Nanoparticle Hybrids." ACS Applied Materials & Interfaces 2, no. 5 (April 20, 2010): 1492–98. http://dx.doi.org/10.1021/am1001184.

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

Krishnamoorti, Ramanan, and Koray Yurekli. "Rheology of polymer layered silicate nanocomposites." Current Opinion in Colloid & Interface Science 6, no. 5-6 (November 2001): 464–70. http://dx.doi.org/10.1016/s1359-0294(01)00121-2.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Tamura, Kenji, Hirohisa Yamada, Shingo Yokoyama, and Keiji Kurashima. "Regularly Interstratified Layered Silicate-Polymer Nanocomposite." Journal of the American Ceramic Society 91, no. 11 (November 2008): 3668–72. http://dx.doi.org/10.1111/j.1551-2916.2008.02680.x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Maiti, Pralay, Carl A. Batt, and Emmanuel P. Giannelis. "New Biodegradable Polyhydroxybutyrate/Layered Silicate Nanocomposites." Biomacromolecules 8, no. 11 (November 2007): 3393–400. http://dx.doi.org/10.1021/bm700500t.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

LeBaron, P. "Polymer-layered silicate nanocomposites: an overview." Applied Clay Science 15, no. 1-2 (September 1999): 11–29. http://dx.doi.org/10.1016/s0169-1317(99)00017-4.

Full text

APA, Harvard, Vancouver, ISO, and other styles

28

Dirama, Taner, and Lloyd Goettler. "Film Blowing of Layered Silicate Nanocomposites." Materials and Manufacturing Processes 21, no. 2 (April 1, 2006): 199–210. http://dx.doi.org/10.1081/amp-200068675.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

Chen, Chenggang, and Tia Benson Tolle. "Fully exfoliated layered silicate epoxy nanocomposites." Journal of Polymer Science Part B: Polymer Physics 42, no. 21 (2004): 3981–86. http://dx.doi.org/10.1002/polb.20259.

Full text

APA, Harvard, Vancouver, ISO, and other styles

30

Sinha Ray, Suprakas, and Masami Okamoto. "New Polylactide/Layered Silicate Nanocomposites, 6." Macromolecular Materials and Engineering 288, no. 12 (December 2003): 936–44. http://dx.doi.org/10.1002/mame.200300156.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

Krishnamoorti, Ramanan, Jiaxiang Ren, and Adriana S. Silva. "Shear response of layered silicate nanocomposites." Journal of Chemical Physics 114, no. 11 (March 15, 2001): 4968–73. http://dx.doi.org/10.1063/1.1345908.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Kornmann, X., L. A. Berglund, R. Thomann, R. Mulhaupt, and J. Finter. "High performance epoxy-layered silicate nanocomposites." Polymer Engineering & Science 42, no. 9 (September 2002): 1815–26. http://dx.doi.org/10.1002/pen.11074.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Yeh, Jui-Ming, and Kung-Chin Chang. "Polymer/layered silicate nanocomposite anticorrosive coatings." Journal of Industrial and Engineering Chemistry 14, no. 3 (May 2008): 275–91. http://dx.doi.org/10.1016/j.jiec.2008.01.011.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

González-Vidal, Nathalie, Sebastián Muñoz-Guerra, Antxon Martínez de Ilarduya, Samira Benali, Sophie Peeterbroeck, and Philippe Dubois. "Poly(hexamethylene terephthalate)–layered silicate nanocomposites." European Polymer Journal 46, no. 2 (February 2010): 156–64. http://dx.doi.org/10.1016/j.eurpolymj.2009.10.018.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

Pospiech, Doris, Andreas Korwitz, Hartmut Komber, Dieter Voigt, Dieter Jehnichen, Jan Müller, Andreas Janke, Thorsten Hoffmann, and Bernd Kretzschmar. "In situ Synthesis of Poly(ethylene terephthalate)/layered Silicate Nanocomposites by Polycondensation." High Performance Polymers 19, no. 5-6 (October 2007): 565–80. http://dx.doi.org/10.1177/0954008307081199.

Full text

Abstract:

The goal of the work presented here was to develop nanocomposites consisting of layered silicates and poly(ethylene terephthalate) (PET). Two nanocomposite preparation methods were compared: first, the usual melt compounding technique, and second, in-situ synthesis of PET in presence of different types of layered silicates. Montmorillonite (MMT) without and with organophilic modification was employed as layered silicate. In most cases, PETs with acceptable properties (molecular weight and discoloration) were synthesized in presence of different MMTs although the molecular weights of the in-situ PETs were lower than the control sample. These materials were used as masterbatch for PET nanocom-posites with 5 wt.% inorganic content. The exfoliation in both types of nanocomposites was not complete, but they showed a good distribution of clay within the polymer matrix.

APA, Harvard, Vancouver, ISO, and other styles

36

Shalwan, A., A. I. Alateyah, B. Aldousiri, and M. Alajmi. "Thermal and Nanoindentation Behaviours of Layered Silicate Reinforced Recycled GF-12 Nanocomposites." Journal of Materials Science Research 5, no. 4 (August 27, 2016): 10. http://dx.doi.org/10.5539/jmsr.v5n4p10.

Full text

Abstract:

This work is an attempt to improve the thermal and nanoindentation behaviours of recycled Glass-Filled Polyamide-12 (GF-12) by adding layered Silicate (Nanoclay) as a reinforced filler. Differential Scanning Calorimetry (DSC) and Nanoindentation tests were conducted to study the effect of various loading levels (0-7 wt. %) of Nano-layered silicate on the thermal and nanohardness behaviours of GF-12 and its nanocomposites. Wide Angle X-ray Diffraction (WAXD) was employed to characterise the nanostructure of material and determine the intercalation/exfoliation for layered silicate in a GF-12 matrix. This study reveals that the layer silicate has a positive effect on the hardness results. Nanoindentation results showed remarkable improvement when layered silicate was added to recycled GF-12. The Glass transition (Tg) and crystallization (Tc) temperatures showed a slight improvement over the base polymer by the incorporation of layered silicate. Moreover, the enhancement of crystallization was obvious with the addition of clay loading, which functioned as a nucleating agent that could increase the rate of crystallization.

APA, Harvard, Vancouver, ISO, and other styles

37

Schmidt, D. F., F. Clément, and E. P. Giannelis. "On The Origins of Silicate Dispersion in Polysiloxane/Layered-Silicate Nanocomposites." Advanced Functional Materials 16, no. 3 (February 3, 2006): 417–25. http://dx.doi.org/10.1002/adfm.200500008.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

Filippi, Sara, Miriam Cappello, Manuel Merce, and Giovanni Polacco. "Effect of Nanoadditives on Bitumen Aging Resistance: A Critical Review." Journal of Nanomaterials 2018 (November 27, 2018): 1–17. http://dx.doi.org/10.1155/2018/2469307.

Full text

Abstract:

Starting from the eighties, the use of nanoadditives registered an increasing attention in the scientific and patent literature, especially for the case of polymeric nanocomposites. In the last decade, this involved bituminous materials, modified either with nanosized fillers or with polymeric nanocomposites. One of the expected benefits is an increased resistance of the binder to aging. After a short introduction underlining the uncertainties and risks of artefacts in aging tests, a review is given, focusing on the antiaging properties of layered silicates, which are by far the most important nanoadditives for bitumens. Together with layered silicates, other materials such as nanohydrated lime, nanosilica, and layered double hydroxides are mentioned. Preparation and characterization of the binary bitumen/layered silicate and ternary bitumen/layered silicate/polymer systems are described in order to individuate the aspects that influence the antiaging effect. Even if the available literature is quite abundant and unanimously confirms that nanoadditives may improve bitumen durability, there is a lack of studies clarifying the involved mechanisms. As it is for conventional fillers, it seems to be a combination of physical and chemical interactions. Nanoadditives with different chemistries, porosities, and interlayer spacings differently absorb the polar components from the bitumen, thus affecting their predisposition to oxidative aging.

APA, Harvard, Vancouver, ISO, and other styles

39

Gilman, Jeffrey W., Richard H. Harris, John R. Shields, Takashi Kashiwagi, and Alexander B. Morgan. "A study of the flammability reduction mechanism of polystyrene-layered silicate nanocomposite: layered silicate reinforced carbonaceous char." Polymers for Advanced Technologies 17, no. 4 (2006): 263–71. http://dx.doi.org/10.1002/pat.682.

Full text

APA, Harvard, Vancouver, ISO, and other styles

40

HAN, SUNG SOO, YANG-WHAN CHO, and SOO-YOUNG PARK. "THE STRUCTURAL DEVELOPMENT OF NYLON6/LAYERED SILICATE NANOCOMPOSITE DURING ZONE-DRAWING." International Journal of Modern Physics B 20, no. 25n27 (October 30, 2006): 4577–82. http://dx.doi.org/10.1142/s0217979206041719.

Full text

Abstract:

The structural development of nylon6/layered silicate nanocomposite during zone-drawing was studied using X-ray scattering and dynamic mechanical thermal analysis. The γ form, which was favored in the pressed film, was converted into the α form during zone-drawing. The newly developed α form, during zone-drawing, has a better orientation than the existing γ form, thus supporting the claim that the α form crystallizes away from the polymer-silicate inter-phase region during drawing. The degree of orientation of the layered silicate, projected along the TD direction, increases with the increase of the draw ratio, suggesting that the layered silicate has become straighter during zone-drawing, although the layered silicate within the zone-drawn film buckled perpendicular to the draw direction. The β transition of the dynamic mechanical thermal analysis is independent of the crystalline phase, although the α transition is strongly dependent upon the crystalline phase. This can be explained by the free volume that exists in the inter-phase between the γ lamellar and the layered silicate.

APA, Harvard, Vancouver, ISO, and other styles

41

Maiti, Pralay, and Jaya P. Prakash Yadav. "Biodegradable Nanocomposites of Poly(hydroxybutyrate-co-hydroxyvalerate): The Effect of Nanoparticles." Journal of Nanoscience and Nanotechnology 8, no. 4 (April 1, 2008): 1858–66. http://dx.doi.org/10.1166/jnn.2008.18251.

Full text

Abstract:

Copolymer of hydroxybutyrate and hydroxyvalerate, P(HB-HV)/layered silicate or hydroxyapatite nanocomposites were prepared via melt extrusion. The nanostructure, as observed from wide-angle X-ray diffraction and transmission electron microscopy, indicate intercalated hybrids for layered silicates. Hydroxyapatite of nanometer dimension is uniformly distributed in matrix copolymer. The nanohybrids show significant improvement in thermal and mechanical properties of the copolymer as compared to the neat copolymer. The layered silicate nanocomposites exhibit superior mechanical properties as compared to hydroxyapatite nanohybrid. The thermal expansion coefficient is significantly reduced in nanohybrids. The biodegradability of pure copolymer and its nanocomposites were studied at room temperatures under controlled conditions in compost media. The rate of biodegradation of copolymer is enhanced dramatically in the nanohybrids. Hydroxyapatite hybrid shows highest rate of biodegradation. The change in biodegradation is streamlined in terms of nature of nanoparticles used to prepare hybrids.

APA, Harvard, Vancouver, ISO, and other styles

42

Loukhina, Inna V. "Hybrid system «layered magnesium silicate – chlorin е6 13(1),15(2),17(3)-N,N',N''-(2-hydroxyethyl)triamide»." Butlerov Communications 62, no. 4 (April 30, 2020): 12–18. http://dx.doi.org/10.37952/roi-jbc-01/20-62-4-12.

Full text

Abstract:

Matrices based on layered silicates have a set of useful properties, in particular, they are able to increase the stability and photosensitizing ability of porphyrins. Hybrid systems “layered silicate - porphyrin (metal porphyrin)” are promising as active components of systems for light collecting and artificial photosynthesis, catalysts, photocatalysts. The hybrid systems with content of 1.4∙10-6 and 4.2∙10-6 mol of the chlorin e6 13(1),15(2),17(3)-N,N',N''-(2-hydroxyethyl)triamide per 1 g of layered magnesium silicate was obtained by heat treatment method of a synthetic layered magnesium silicate of hectorite composition when treated with an aqueous-alcoholic solution of organic component. The molar ratio of the starting components is: Mg(OH)2 : SiO2 : LiF = 1 : 1.51 : 0.25 : chlorin e6 derivative = 1 : 1.51 : 0.25 : (19.93∙10-5 – 59.58∙10-5). Using dynamic light scattering and laser Doppler electrophoresis, it was shown that the introduction of chlorin e6 13(1),15(2),17 (3)-N,N',N''- (2-hydroxyethyl) triamide leads to the growth of hybrid particles (162 ± 3 nm) and a decrease in their aggregative stability (-30 ± 1 mV), compared with the initial layered magnesium silicate (133 ± 1 nm, -33 ± 1 mV). In this case, the introduction of more hydrophilic chlorin e6 13(1),15(2),17(3)-N,N',N''-(2-hydroxyethyl)triamidе, in the molecule of which there are three fragments of ethanolamine, allows to obtain smaller hybrid particles (162 ± 3 nm), compared with hybrid particles (248 ± 6 nm) formed by the action of chlorin e6 13(1),17(3)-N,N'-(2-hydroxyethyl)diamide15(2)-methyl ether, in the molecule of which there are two fragments of ethanolamine. Using the methods of X-ray phase analysis and electron spectroscopy in the UV-visible region, it was found that individual molecules of chlorin e6 13(1),15(2),17(3)-N,N',N''-(2-hydroxyethyl)triamide were sorbed on the surface of silicate particles due to the electrostatic interaction between the protonated molecules of the macrocycle and the ionized hydroxyl groups of magnesium silicate. It was shown that the higher hydrophilicity of chlorin e6 13(1),15(2),17(3)-N,N',N''-(2-hydroxyethyl)triamide, compared with chlorin e6 13(1),17(3)-N,N'-(2-hydroxyethyl)diamide15(2)-methyl ether did not contribute to the intercalation of the organic component into the interlayer space of layered magnesium silicate under the conditions of a water-alcohol medium.

APA, Harvard, Vancouver, ISO, and other styles

43

Corobea, M. C., D. Donescu, S. Grishchuk, N. Castellà, A. A. Apostolov, and J. Karger-Kocsis. "Organophilic Layered Silicate Modified Vinylester-Urethane Hybrid Resins: Structure and Properties." Polymers and Polymer Composites 16, no. 8 (October 2008): 547–54. http://dx.doi.org/10.1177/096739110801600808.

Full text

Abstract:

A commercial vinylester-urethane (VEUH) hybrid resin was modified with organophilic layered silicates (OLS), incorporated in various amounts (0.1 to 5 wt.%). As organophilic intercalants of the layered silicate (synthetic fluorohectorite) trimethyl dodecylamine (TMDA) and octadecylamine - N,N-bis[allyl(2-hydroxypropyl)ether] (OAE) served. The latter quaternary amine was expected to support the intercalation/exfoliation of the silicate by participating in the crosslinking reactions. Both OLS types became intercalated based on X-ray diffractograms (XRD). Dynamic-mechanical thermal analysis (DMTA) displayed a slight increase in the stiffness by adding OLS up to 2.5 wt.%. However, at 5wt% OLS content the stiffness of the nanocomposites was below that of the unfilled hybrid resin. The glass transition temperature (Tg) did not change practically with the OLS type and content. Fracture mechanical tests were performed on compact tension (CT) specimens. The fracture toughness (Kc) increased slightly, while the fracture energy (Gc) markedly with increasing OLS content. Unexpectedly, TMDA proved to be a more suitable intercalant than OAE. The failure mode of the specimens was studied in a scanning electron microscope (SEM) and discussed. In addition, the water sorption behavior of the OLS modified VEUHs was determined and the diffusion coefficients (D) deduced.

APA, Harvard, Vancouver, ISO, and other styles

44

Volfson, Svetoslav Isaakovich, N. A. Okhotina, and Alina Ildusovna Nigmatullina. "Thermoplastic Vulcanizates Filled with а Layered Silicate." Key Engineering Materials 816 (August 2019): 119–23. http://dx.doi.org/10.4028/www.scientific.net/kem.816.119.

Full text

Abstract:

Oil-resistant and thermoformed thermoplastic vulcanizates based on butadiene-nitrile rubber and polypropylene were obtained, containing a layered silicate montmorillonite as a filler. The structural characteristics of composites based on thermoplastic vulcanizates were studied using the methods of fractal analysis. It has been established that the value of the static flexibility of the polymer chain of a thermoplastic vulcanizate containing montmorillonite exceeds the static flexibility of the polymer chain of an unfilled thermoplastic vulcanizate. It is shown that the introduction of montmorillonite in the amount of 1-3 pbw in thermoplastic vulcanizates leads to improved performance characteristics of the obtained composites.

APA, Harvard, Vancouver, ISO, and other styles

45

Psarras, G. C., K. G. Gatos, P. K. Karahaliou, S. N. Georga, C. A. Krontiras, and J. Karger-Kocsis. "Relaxation phenomena in rubber/layered silicate nanocomposites." Express Polymer Letters 1, no. 12 (2007): 837–45. http://dx.doi.org/10.3144/expresspolymlett.2007.116.

Full text

APA, Harvard, Vancouver, ISO, and other styles

46

Stan, A., I. Dinca, C. Ban, S. Ilina, Dan Donescu, H. Paven, L. Dumitrache, L. Gavrila, and I. Voicu. "Epoxy-Layered Silicate and Epoxy MWCNTs Nanocomposites." Applied Mechanics and Materials 146 (December 2011): 160–69. http://dx.doi.org/10.4028/www.scientific.net/amm.146.160.

Full text

Abstract:

The paper deals with the rheological properties of epoxy resin additivated with organically modified montmorillonites, carbon nanotubes and nanocarbon. The paper also presents the influence of nanoadditives over composites mechanical properties. The epoxy polymer is diglycidyl ether of bisphenol A (DGEBA) and the curing agent is an aliphatic tetraamine. Organically modified montmorillonites Cloisite 30B and Cloisite 93A, MWCNTs and laser synthesized nanocarbon were used to synthesize nanocomposites by dispersing each in an epoxy resin. The dispersion was achieved through mechanical and sonic methods. The epoxy resin additivated with nanosized fillers was rheologically tested to study the dispersion influence. The sonic dispersion of nanoadditives is observed to drastically influence the rheological behavior of the suspensions. Newtonian fluid behavior disappears as the additive loading increases. The work mentions the influence of nanoadditives on the manufacturing process of epoxy /glass fibre and epoxy/ carbon fibre laminated composites.

APA, Harvard, Vancouver, ISO, and other styles

47

Osman, Maged A., Jörg E. P. Rupp, and Ulrich W. Suter. "Tensile properties of polyethylene-layered silicate nanocomposites." Polymer 46, no. 5 (February 2005): 1653–60. http://dx.doi.org/10.1016/j.polymer.2004.11.112.

Full text

APA, Harvard, Vancouver, ISO, and other styles

48

Tolle, Tia Benson, and David P. Anderson. "Morphology development in layered silicate thermoset nanocomposites." Composites Science and Technology 62, no. 7-8 (June 2002): 1033–41. http://dx.doi.org/10.1016/s0266-3538(02)00039-8.

Full text

APA, Harvard, Vancouver, ISO, and other styles

49

Fong, Hao, Richard A. Vaia, Jeffrey H. Sanders, Derek Lincoln, Andrew J. Vreugdenhil, Weidong Liu, John Bultman, and Chenggang Chen. "Self-Passivation of Polymer-Layered Silicate Nanocomposites." Chemistry of Materials 13, no. 11 (November 2001): 4123–29. http://dx.doi.org/10.1021/cm010150o.

Full text

APA, Harvard, Vancouver, ISO, and other styles

50

Beyer, Frederick L., Nora C. Beck Tan, Arnab Dasgupta, and Mary E. Galvin. "Polymer−Layered Silicate Nanocomposites from Model Surfactants." Chemistry of Materials 14, no. 7 (July 2002): 2983–88. http://dx.doi.org/10.1021/cm011639k.

Full text

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Layered silicate'

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