【摘要】 在负载双金属PBM型催化剂下,以二氧化碳(CO2),环氧丙烷(PO)和马来酸酐(MA)为原料,三元共聚反应合成了聚碳酸亚丙酯马来酸酐(PPCMA)。采用FTIR1、H-NMR1、3C-NMR、DSC等对PPCMA进行了表征。结果表明,产物中引入了马来酸酐单元且共聚过程中不发生双键交联和构型转化;同时,马来酸酐单元的引入有效地提高了聚合物的特性粘数[η],玻璃化转变温度Tg以及热稳定性;且增强了材料的降解性;不同的聚合反应时间对PPCMA的特性粘数和粘均分子量有着明显的影响。更多还原

【Abstract】 An aliphatic polycarbonate poly [(propylene oxide )-co-(carbon dioxide)-co-(maleic anhydride)](PPCMA),was synthesized by the terpolymerization of carbon dioxide(CO2),propylene oxide(PO),and Maleic anhydride(MA),using a polymer supported bimetallic complex as catalyst.The copolymer was characterized by FTIR,1H-NMR,13C-NMR and DSC.The results show that the ring of MA was opened and inserted into the backbone of poly [(propylene oxide)-co-(carbon dioxide)] successfully.The intrinsic viscosity,viscosity average molecular weight and glass transition temperature of the copolymers were determined.PPCMA exhibited a Tg of around 45℃,which is higher than that of PPC.The effect of reaction time and n(PO)∶n(MA) on Mv and Tg were investigated.MA offers an ester structure unit that gives the terpolymers remarkable degradability.The degradation rate of the backbone increases with the MA content in the terpolymers.更多还原