共聚合改性可生物降解PBS

Biodegradable PBS modified by copolymerization

通过改变1,4-丁二醇(BD)与1,4-环己烷二甲醇(CHDM)的配比,将其与1,4-丁二酸(SA)进行熔融缩聚合制备可生物降解聚丁二酸丁二酯(PBS)及BD-SA-CHDM共聚物[P(BS-co-CHDM)]。表征了P(BS-coCHDM)的结构并研究了PBS及其共聚物的非等温结晶行为、晶体结构、结晶形态及力学性能。结果表明:Jeziorny法和莫志深法均可很好地描述P(BS-co-CHDM)的非等温结晶行为,与PBS相比,P(BS-co-CHDM)的结晶速率随CHDM含量的增加先增大再减小;P(BS-co-CHDM)的晶体结构与PBS相同,仍为单斜α晶,70℃等温结晶2 h后,球晶尺寸随P(BS-co-CHDM)中CHDM含量的增加而减小;y(CHDM)为20%时,P(BS-co-CHDM)的断裂拉伸应变达208.9%。

Both biodegradable poly（butylene succinate）（PBS） and poly（butylene succinate-co-1,4-cyclohexanedimethanol） [P（BS-co-CHDM）] were synthesized via melt polycondensation of blends of 1,4-butanediol and 1,4-cyclohexanedimethanol（CHDM） with different ratios and 1,4-succinic acid. The structure of P（BS-co-CHDM） was characterized,and the non-isothermal crystallization behaviors,crystal structures, crystalline morphology and mechanical properties of PBS and P（BS-co-CHDM） were studied. The results show that Jeziorny＇s and Mo＇s method can well describe the non-isothermal crystallization of P（BS-co-CHDM）. With the increase in CHDM content,the crystallization rate of P（BS-co-CHDM） increases first and decreases then compared to that of PBS. However,the crystallization mechanism of the copolymer keeps unchanged and the unit cell is monoclinic α form. The spherulite size is reduced with the increase of CHDM content after isothermal crystallization of the copolymer at 70 ℃ for two hours. The tensile strain at break of P（BS-co-CHDM）reaches 208.9% when the molar percentage of CHDM is 20%.