CuCl/bpy催化的苯乙烯原子转移自由基悬浮聚合  

Atom Transfer Radical Suspension Polymerization of Styrene Catalyzed by CuCl/bpy

作　　者：张敏[1] 严小玲[1] 朱常英[1] 杜宗杰[1] 

机构地区：[1]南开大学化学系,天津300071

出　　处：《南开大学学报（自然科学版）》2006年第4期7-12,共6页Acta Scientiarum Naturalium Universitatis Nankaiensis

摘　　要：以1-苯基氯乙烷(1-PEC l)为引发剂、氯化亚铜(CuC l)为催化剂、2,2′-联吡啶(bpy)为配体,采用开放体系,在外加搅拌和氮气保护下,研究了苯乙烯的悬浮法原子转移自由基聚合(ATRP),采用分散相水中加入电解质N aC l的方法抑制催化剂配合物向水相的扩散.结果表明,所得聚合物的分子量随转化率呈线性增加,分子量分布较窄(分布指数可达1.40),聚合反应对单体浓度为一级动力学关系,经计算聚合体系的活性自由基浓度为6.89×1-0 8m o l/L;而对A IBN为引发剂时该催化体系的反相ATRP悬浮聚合研究显示,聚合反应可控性很差,原因在于CuC l2的水溶性太强.Atom transfer radical suspension polymerization （suspension ATRP） was carried out using 1-phenyl ethyl chloride （1-PECl） as initiator, cuprous chloride （CuCl） as catalyst, 2,2＇-bipyridine （bpy） as ligand. The polymerization was accomplished with a mechanical agitator under the protection of nitrogen atmosphere. Apart from the dispersing agent （1 % PVA and 1 % gelation）, NaCl was also used in the dispersion phase （H2O） to decrease the diffusion of CuCl/bpy to water. The results showed that the molecular weight distribution was narrow （Mw/Mn= 1.40）. These indicated the suspension ATRP of styrene demonstrated ＂living＂/controlled character. The plot of ln[M]0/[M] versus time was linear, indicating that the polymerization was one order to monomer concentration. The reactive radical concentration was calculated as 6.89 × 10^-8 mol/L. The reverse suspension ATRP of styrene was also investigated using AIBN as initiator, CuCl2/bpy as catalyst. However, the control of the polymerization was poor, characterized by the larger molecular weight distribution index （Mw/Mn= 2.98）.

关 键 词：苯乙烯 原子转移自由基聚合 悬浮聚合 

分 类 号：O631.1[理学—高分子化学]