| 极性介质中醋酸乙烯酯的辐照引发分散聚合 |
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| 引用本文： | 叶强,张新峰,葛学武,张志成.极性介质中醋酸乙烯酯的辐照引发分散聚合[J].高分子学报,2003(5):718-723. |
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| 作者姓名： | 叶强 张新峰 葛学武 张志成 |
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| 作者单位： | 中国科学技术大学高分子科学与工程系,合肥,230026 |
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| 基金项目： | 安徽省自然科学基金 (批准号 0 3 0 44 80 3 )，中国科技大学青年基金 (KB 3 0 15 )资助项目 |
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| 摘 要： | 用钴 60γ射线引发醋酸乙烯酯的分散聚合 ,通过选择各种极性溶剂体系 ,确立了醋酸乙烯酯在极性介质中稳定的分散聚合体系 .对异丙醇 水体系 ,聚合物分子量随剂量率的降低、稳定剂含量的增加、单体浓度的增大、反应温度的升高以及醇水比的降低而增加 .运用XPS、元素分析等表征聚合物粒子 ,及通过辐射接枝理论的分析 ,可以判断稳定剂所起的稳定作用主要是以物理吸附为主
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| 关 键 词： | 辐射引发 分散聚合 醋酸乙烯酯 分子量 稳定机理 |
| 修稿时间： | 2002年11月6日 |
STUDY ON RADIATION-INDUCED DISPERSION POLYMERIZATION OF VINYL ACETATE IN POLAR MEDIA |
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| YE Qiang,Zhang Xinfeng,Ge Xuewu,Zhang Zhicheng.STUDY ON RADIATION-INDUCED DISPERSION POLYMERIZATION OF VINYL ACETATE IN POLAR MEDIA[J].Acta Polymerica Sinica,2003(5):718-723. |
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| Authors: | YE Qiang Zhang Xinfeng Ge Xuewu Zhang Zhicheng |
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| Abstract: | The dispersion polymerization of VAc initiated by gamma ray irradiation was carried out in polar media using poly(N-vinylpyrrolidone) as a steric stabilizer at room temperature This method takes advantages of the specialities of radiation induction, and highly uniform polymer microspheres were obtained The molecular weight of the polymer increased with the increase of stabilizer content and polymerization temperature, and the decrease of absorbed dose rate, monomer concentration, and ratio of alcohol/water Based on the experimental results (XPS and element analysis), only the physical adsorption of stabilizer was found in the polymer particles Compared with other monomers, vinyl acetate may not be inclined to graft-copolymerize with poly(N-vinylpyrrolidone) in radiation polymerization systems This is maybe due to the low activity of VAc grafting with the stabilizer according to the theory of radiation grafting |
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| Keywords: | Radiation-induced Dispersion polymerization Vinyl acetate Molecular weight Stabilization mechanisms |
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