聚酰胺酸相对分子质量对亚胺化速率的影响  

Effect of molecular weight of poly(amic acid) end-capped with phthalic anhydride on the rate of imidization

作　　者：刘俊英[1] 刘芳[1] 程茹[1] 黄培[1] 时钧[1] 

机构地区：[1]南京工业大学化学化工学院,江苏南京210009

出　　处：《南京工业大学学报（自然科学版）》2004年第6期11-14,20,共5页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：国防科工委资助

摘　　要：以邻苯二甲酸酐为封端剂,控制合成了3种相对分子质量的聚酰胺酸,利用改进的电位滴定法对经热处理的聚酰胺酸的亚胺化程度进行了测定。实验结果表明:随着聚合度的增大,聚酰胺酸的特性粘数逐渐增大;聚合度为1的聚酰胺酸的链段运动能力强,反应速率快;聚合度为6的聚酰胺酸反应速率稍大于聚合度为18的聚酰胺酸,但在反应初期较聚合度为18的慢,且它们的剩余聚酰胺酸的质量分数较为相近。A series of poly(amic acid) end-capped with phthalic anhydride was synthesized, their polymerization degree was 1,6 and 18, and their intrinsic viscosity was 6.4, 7.6, 9.3 ml/g,respectively. The content of residual amic acid in imidization was determined by an improved potentiometric titration device. The results showed that the polymer with 1 of polymerization degree had the fastest imidization rate; and the rate of the polymer with 6 of polymerization degree had greater than that of the polymer, which polymerization degree was 18.But they had nearly the same content of residual amic acid at 20 min.

关 键 词：聚酰胺酸 聚合度 相对分子质量 酸酐 封端剂 控制合成 反应速率 亚胺化 链段运动 动能 

分 类 号：TQ323.7[化学工程—合成树脂塑料工业] O633.22[理学—高分子化学]