环氧丙烷阴离子聚合——相对分子质量上限及其影响因素  

Poly(propylene oxide) Anionic Polymerization——Upper Limit of Relative Molar Mass and Related Factors

作　　者：杨鹏飞[1] 朱叙伟[2] 李天铎[1] 

机构地区：[1]江南大学化学与材料工程学院,江苏无锡214122 [2]山东轻工业学院轻化与环境工程学院,山东济南250353

出　　处：《精细化工》2008年第9期934-936,共3页Fine Chemicals

基　　金：国家自然科学基金资助项目(20676074)~~

摘　　要：用叔丁醇钾作催化剂，对环氧丙烷进行本体阴离子聚合，设计聚合物的数均相对分子质量为1000～5000，用激光光散射和核磁共振测定其相对分子质量，确定了聚环氧丙烷的相对分子质量上限为2600左右。用在线红外技术跟踪聚合过程，研究环氧丙烷（828cm^-1）、聚醚（1107cm^-1）、C=C双键（1660cm^-1）的吸光度变化曲线，发现除了链转移反应外，体系中阴离子活性中心失活也会制约相对分子质量增加。The anionic bulk polymerization of propylene oxide with potassium t-butoxide as initiating agent was investigated by in-situ FTIR technique. Relative molar mass, which is designed from 1 000 to 5 000, is determined as about 2 600 at the most by Laser light scattering （LLS） and nuclear magnetic resonance（NMR）. IR absorbances of propylene oxide,C--O--C bond and C=C bond were studied in the region of 828 cm^-1, 1 107 cm^-1 and 1 660 cm^-1 respectively. It is showed that during the polymerization, besides the reason of chain-transfer, the intermediate may lose its activity and limits the increase of molecular weight.

关 键 词：环氧丙烷 聚合 相对分子质量 在线红外 

分 类 号：O631.6[理学—高分子化学]