Abstract
Free radical homopolymerization experiments were conducted with 2-methylene-1,3-dioxepane in supercritical carbon dioxide (scCO2) using a heterogeneous precipitation polymerization method and AIBN as the initiator. We also synthesized copolymers of 2-methylene-1,3-dioxepane with N-vinyl-2-pyrrolidone. The influence of comonomer feed ratios on the yield, glass transition temperature (Tg) and copolymer composition was investigated. The copolymers produced were characterized by 1H NMR, FT-IR spectroscopy and DSC. Reactivity ratios of comonomer in the initial step of the precipitation copolymerization process were estimated from copolymer composition analysis. In addition, we investigated the effect of reaction temperature on the reactivity ratios and determined that the reactivity ratios slightly increased and that MDOP had a larger deviation of reactivity ratio than that of NVP with the increased temperature. And the fine sub-micron sized copolymer particles containing with various comonomer ratios were prepared by aerosol solvent extraction system (ASES).
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