• 作者： 蕭榮超; 山口格
• 作者服務機構： Contribution from the Department of Applied Chemistry, Faculty of Engineering, Tohoku University, Sendai, Japan
• 中文摘要： Polymerization of vinyl acetate (VAc) was carried out with potassium (KPS) and ammonium sulfite as redox initiator in the presence of acetonitrile for the purpose of preparation of polyvinyl alcohol (PVA) of desired degree of polymerization (DP). The PVA obtained by this method at 0℃ showed higher DP and lower solubility in water. It was observed that acetonitrile was a useful chain transfer agent in this polymerization system. it was also observed that ZnCl2 accelerated the polymerization of VAc and the over-all activation energy of polymerization was 9.73 Kcal/mol. However, the stereore-gularity of PVA obtained by the saponification of PVAc in this system was not improved by the presence of ZnCl2.
• 英文摘要： --
• 中文關鍵字： --
• 英文關鍵字： --