反应温度对二氧化碳/1,2-环氧丁烷/ε-己内酯三元共聚物性能的影响

Influence of Reaction Temperature on Terpolymers of Dioxide/1,2-Butylene Oxide/ε-Caprolactone Properities

以高聚物负载型双金属阴离子配位化合物PBM为催化剂,通过二氧化碳（CO2）,1,2-环氧丁烷（BO）与ε-己内酯（CL）的三元开环共聚合反应,得到新型脂肪族聚碳酸酯（PBCL）。对PBCL进行了FT-IR1、H-NMR1、3C-NMR、DSC和WAXD等表征。并研究了反应温度对PBCL性能的影响。研究表明,当反应温度在60℃-70℃之间时,共聚物为无定型结构,特性粘数[η]和粘均分子量（-Mv）随着反应温度的升高而升高;当反应温度升高至80℃-90℃时,PBCL出现部分结晶,随着反应温度的升高,[η]和-Mv下降,CL的摩尔分数（fCL）增大,共聚物的结晶度增大,且玻璃化温度（Tg）下降,熔点（Tm）升高。

In this paper, the new polycarbonate （PBCL） was successfully synthesized by terpolymerization of carbon dioxide, 1,2-butylene oxide （BO） and ε-caprolactone （CL）. A polymersupported bimetallic complex （PBM） was used as catalyst. The terpolymers prepared from different temperature were characterized by FT-IR, ^1H-NMR, ^13C-NMR, DSC and WAXD measurements. The influence of reaction temperature on terpolymer properties was investigated. The results reveal that the PBCL terpolymers are amorphous, and the intrinsic viscosity [ η ] and viscosity-average molecular weights （M^-v） increase as the reaction temperature changed from 60 ℃ to 70 ℃ ; Then, the PBCL terpolymers are partly crystalline, and [ η] and M^-v drops when the temperature is increased from 80 ℃ to 90 ℃. The molar fraction of CL （fCL）, crystallinity of copolymers increases with increasing of reaction temperature. The higher temperature, the higher melting point （Tm）, the lower glass transition temperature （Tg） are.