高交替度聚碳酸亚环己酯的合成与热性能

Synthesis and Characterization of Highly Alternative Poly(Cyclohexenylene Carbonate)

文中用SalenAl(OiPr)作催化剂,并以路易斯碱为共催化剂,催化二氧化碳与氧化环己烯共聚得到了高产率高交替度(碳酸酯键含量>99%)的聚碳酸亚环己酯。用1H-NMR、IR、DSC、TG等对共聚产物进行了结构性能的分析和表征。DSC和TGA结果表明,该高交替度聚碳酸亚环己酯的玻璃化转变温度(Tg)为135℃,在280℃左右开始分解,350℃完全分解。并讨论了碳酸酯键含量对共聚物的热分解性能的影响,进一步表明了碳酸酯含量高的共聚物具有热分解的彻底性。

SalenAl（Oipr） complex was prepared and used for copolymerization of cyclohexene oxide with carbon dioxide, affording highly alternative poly （cyclohexenylene carbonate）（PCHC）. Effects of reaction condition on copoymerization were investigated in detail. The catalytic efficiency could reach 516 g PCHC/g Cat and the resuhed products were confirmed to be nearly alternative copolymers （carbonate〉99%） by 1H-NMR. DSC and TGA of these polymers results show that the highly ahernative PCHC copolymer exhibits higher glass transition temperature （135℃ ） and a relative low decomposition temperature （280℃） and decompose completely upon 350℃. The highly alternative poly（cyclohexenylene carbonate）, with excellent thermal decompose property, can be applied as MEMS sacrificial material.