Precipitation polymerization of 2-methylene-1,3-dioxepane in Supercritical carbon dioxide

被引：10

作者：

Kwon, Soyoung ^{[1
,2
]}

Lee, Kyoungwon ^{[1
,2
]}

Bae, Won ^{[3
]}

Kim, Hwayong ^{[1
,2
]}

机构：

[1] Seoul Natl Univ, Sch Chem & Biol Engn, Seoul 151744, South Korea

[2] Seoul Natl Univ, Inst Chem Proc, Seoul 151744, South Korea

[3] Miwon Commercial Co Ltd, R&D Inst, Ansan 425100, South Korea

来源：

POLYMER JOURNAL | 2008年 / 40卷 / 04期

关键词：

biodegradable polymer; 2-methylene-1,3-dioxepane; precipitation polymerization; Supercritical carbon dioxide; N-vinyl-2-pyrrolidone; ASES;

D O I：

10.1295/polymj.PJ2007095

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Free radical homopolymerization experiments were conducted with 2-methylene-1,3-dioxepane in supercritical carbon dioxide (scCO(2)) 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 (T-g) and copolymer composition was investigated. The copolymers produced were characterized by H-1 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).

引用

页码：332 / 338

页数：7

共 40 条

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