Preparation and thermal property of hybrid nanocomposites by free radical copolymerization of styrene with octavinyl polyhedral oligomeric silsesquioxane |
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Authors: | Benhong Yang Hongyao Xu Jiafeng Wang Shanyi Gang Cun Li |
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Affiliation: | 1. School of Chemistry and Chemical Engineering, Anhui University, Hefei 230039, People's Republic of China;2. Department of Chemical and Material Engineering, Hefei University, Hefei 230022, People's Republic of China;3. College of Material Science and Engineering and State Key Laboratory for Modification of Chemical Fibers and Polymeric Materials, Dong Hua University, Shanghai 200051, People's Republic of China |
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Abstract: | The poly(styrene‐co‐octavinyl‐polyhedral oligomeric silsesquioxane) (PS–POSS) organic–inorganic hybrid nanocomposites containing various percent of POSS were prepared via one‐step free radical polymerization and characterized by FTIR, high‐resolution 1H NMR, 29Si NMR, GPC, DSC, and TGA technologies. The POSS contents in these nanocomposites were determined using FTIR calibration curve. The result shows that the POSS contents in nanocomposites can be tailored by varying the POSS feed ratios. On the basis of the POSS contents in the nanocomposites and the 1H NMR spectra, the number of reacted vinyl groups of each octavinyl‐POSS macromonomer were calculated to be 6–8. DSC and TGA measurements indicate that the incorporation of POSS into PS homopolymer can apparently improve the thermal properties of the polymeric materials. The dramatic Tg and Tdec increases are mainly due to the formation of star and low cross‐linking structure of the nanocomposites, where POSS cores behave as the joint points and hinder the motion and degradation of the polymeric chains. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007 |
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Keywords: | synthesis nanocomposites free radical polymerization thermal properties polyhedral oligomeric silsesquioxane |
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