二氧化碳/1,2-环氧丁烷/ε-己内酯的三元共聚合和表征

以高聚物负载型双金属负离子配位化合物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,得到三元共聚物,脂肪族聚碳酸酯(PBCL).对PBCL进行了FTIR1、H-NMR1、3C-NMR、DSC和WAXD等表征,并考察了反应单体比例及反应时间对共聚物性能的影响.结果表明,由于ε-己内酯开环共聚,引入了易水解的羧酸酯单元,PBCL的降解速度和玻璃化转变温度较二氧化碳-环氧丁烷的二元共聚物(PBC)得到了有效地提高.同时,PBCL相对于聚己内酯(PCL)玻璃化转变温度和降解速度明显改善,且PBCL为非晶结构.

CHARACTERIZATION AND TERPOLYMERIZATION OF CARBON DIOXIDE/1,2-BUTYLENE OXIDE/ε-CAPROLACTONE

Some methods have been developed to convert the abundant,cheap CO_2 resources to polymer products,in order to receive a degradable polymer by using CO_2 as the raw material.A new aliphatic polycarbonate(PBCL) was synthesized by terpolymerization of carbon dioxide,(1,2-butylene) oxide(BO) and ε-caprolactone(CL).The terpolymer structure was characterized by FTIR,~1H-NMR,~(13)C-NMR,DSC and WAXD measurements.The influences of various reaction conditions such as the molar ratio of the monomers and the reaction time on the polymerization progress were investigated.The terpolymers were amorphous,the glass transition temperature(T_g) of the terpolymers were above 40℃,which were higher than those of poly(butylene carbonate)(PBC) and poly(ε-caprolactone)(PCL).The biodegradation behavior of these copolymers was investigated in a pH 7.4 phosphate buffer solution at 37℃.The results showed that ε-Caprolactone was inserted into the backbone of poly(butylene oxide)-(carbon dioxide)] successfully.ε-caprolactone offered an ester structure unit that gave the terpolymers remarkable degradability enhanced with increasing CL content in the terpolymers,the weight loss of PBCL55 was 37.68% after 8 weeks in buffer solution immersion test.