摘要
本文采用双官能团引发剂和负离子型催化剂进行了甲基丙烯酸甲酯和甲基丙烯酸Ｃ７～９酯的基团转移嵌段共聚．讨论了温度、单体投料方式、引发剂－催化剂浓度比及单体浓度对聚合反应的影响，认为当两段反应温度分别为８５℃和２５℃时，引发剂浓度［Ｉ］＝１．３５×１０－２ｍｏｌ／Ｌ，催化剂引发剂浓度比［Ｃａｔ］／［Ｉ］＝０．１２６，以活性较低的Ｃ７～９ＭＡ为第一嵌段单体，有利于Ｃ７～９ＭＡ和ＭＭＡ的嵌段共聚．测定了嵌段共聚物的热形变温度；用ＧＰＣ对嵌段共聚物的相对分子质量及分布进行了表征，结合ＩＲ、１ＨＮＭＲ和热形变温度分析，证明所得到的为ＰＭＭＡ－ＰＣ７～９ＭＡ－ＰＭＭＡ均相三嵌段共聚物．
The group transfer block copolymerization of methylmethacrylate(MMA) and C7￣9 methacrylate(C7￣9MA) has been studied by using a bifunctional initiator and an anionic catalyst. The influences of temperature、 monomer sequence、 concentration ratio of initiator to catalyst and concentration of monomers have been investigated. When T1=85 ℃, T2=25 ℃,=135×10-2 mol/L, /=0126, C7￣9MA as first monomer, the block copolymerization of C7￣9MA and MMA appeared to be predominate. The thermal deformation temperatures of the copolymers obtained are reported. The triblock copolymer (PMMAPC7￣9MAPMMA) has been characteriaced by FTIR, 1H NMR, and GPC as a homogeneous phase system.
出处
《应用化学》
CAS
CSCD
北大核心
1997年第5期23-27,共5页
Chinese Journal of Applied Chemistry
基金
国家自然科学基金
