In Situ Synthesis of Polymer Nanocomposites - download pdf or read online

By Vikas Mittal

ISBN-10: 3527328793

ISBN-13: 9783527328796

This e-book familiarizes readers with the confirmed ideas -- in addition to the pitfalls -- excited about effectively synthesizing the different sorts of composites including their a variety of calls for about the processing stipulations and different influencing elements. Following an outline of the synthesis methodologies, the textual content is going directly to speak about the main correct polymer fabrics, together with polyamides, polyolefines, polyacrylates, polyethylenes, polyurethanes, polyesters and polyepoxides.

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However, the caprolactam-HCl-intercalated clay was filtered with much difficulty due to its hydrophilic character, therefore the same researchers group proposed and optimized a process to avoid this step, by carrying the synthesis in “one pot” [55, 59]. For this purpose, acid was added directly to an aqueous suspension of ε-caprolactam and clay and heated to 250 °C to obtain the nanocomposite. They observed that the system was sensitive to the nature of the acid used to promote the intercalation of ε-caprolactam; the obtained results showed that, for unclear reasons, only phosphoric acid allowed for the preparation of a truly exfoliated nanocomposite.

The presence of clay in PA 11 increased the crystallization temperature and the thermal stability of the polymer, while the latter was found to be dependent on the quality of the nanostructure achieved, being superior for the exfoliated nanocomposites (<4 wt% clay) as compared with the intercalated ones (>4 wt% clay). Furthermore, the nanocomposites showed much higher dynamic modulus and stronger shear thinning behavior. Another nanofiller type that has been reported to form PAs nanocomposites by in-situ intercalation are CNTs.

NH3+, ᭺ = COO−, = polyamide salt methylene groups, = surfactant tallow. 45 46 2 Polyamide Nanocomposites by In-situ Polymerization spacing of ∼13 Å. 6 salt. 6 salt by Papaspyrides et al. [28]. It was found that LDH dispersed in the PA matrix at different degrees, yielding from aggregated to exfoliated structures, while it was noted that for higher nanofiller concentrations, aggregate formation was more dominant and the distribution of the LDH particles throughout the matrix appeared to be inhomogeneous.

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In Situ Synthesis of Polymer Nanocomposites by Vikas Mittal

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