Title: SYNTHESIS OF POLY(STYRENE-CO-ACRYLONITRILE)/CLAY NANOCOMPOSITES IN SUPERCRITICAL CARBON DIOXIDE
Page Range: p.223-232
Author(s): Jing Wang; Jianfeng Zhong; Zhou Fang; Qingzhi Dong
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 21
Issue No: No.4
Abstract
Poly(styrene-co-acrylonitrile)/fluorinated montmorillonite was successfully prepared in supercritical carbon dioxide (scCO2) by dispersion polymerisation. In this study, a mixed stabiliser system was applied and investigated. Poly(styrene-r-acrylonitrile)-block-poly(1,1,2,2-tetrahydroperfluorooctyl methacrylate) (PSAN-b-PFOMA) was synthesised and investigated as stabiliser in scCO2. Fluorinated surfactant was used for the modification of the montmorillonite. The fluorinated montmorillonite (FMMT) applied in the polymerisation was not only used as nanocomposite filler but also as a guest stabiliser. This study examined the stabilisation roles of stabiliser and guest stabiliser respectively. The optimum dosages of both compounds were studied. The polymerisation with mixed stabiliser resulted in high yield and high molecular weight. Moreover, a series of nanocomposites were characterized and the products showed excellent properties. It was found that the montmorillonite layer could be completely exfoliated using reasonable loading, and dispersed in the polymer matrix. In addition, the pressure of scCO2 was studied and the density of scCO2 was shown to be relevant to the stabilisation of the reaction. The mixed stabiliser system made the polymerisation more effective and the in-situ dispersion polymerisation performed in scCO2 was shown to be a useful method for the nanocomposites preparation. 37 Refs.
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