聚富马酸丁二酯的水热老化行为研究  

Hydrothermal Aging Behavior of Poly (butylene fumarate)

作　　者：郑柳春[1] 吴绍华[1,2] 李春成[1] 张栋[1] 肖耀南[1] 管国虎[1] 朱文祥[1] 

机构地区：[1]中国科学院化学研究所中国科学院工程塑料院重点实验室,北京100190 [2]中国科学院大学,北京100190

出　　处：《高分子学报》2014年第12期1622-1628,共7页Acta Polymerica Sinica

基　　金：国家自然科学基金(基金号21104087;51373186)资助项目

摘　　要：研究了聚富马酸丁二酯(PBF)的水热老化行为,采用凝胶渗透色谱法(GPC)、力学性能测试,示差扫描量热法(DSC)和全反射红外光谱(ATR-FTIR)研究了老化过程中PBF的分子量、力学性能、热性能和表面化学基团含量的变化.研究结果表明,PBF在30℃下具有良好的耐老化性能.温度对PBF老化行为的影响显著,水热老化温度升至60℃,PBF各项力学性能急剧下降,老化20天后样品在水中断裂并形成碎片,力学性能完全丧失,同时数均分子量下降了50%.80℃水热老化5天,样品即断裂并形成碎片,失去结构的完整性,数均分子量下降了87%.老化过程中碳碳双键的含量未发生明显变化,老化降解的机理是水的增塑、溶胀以及酯键水解,聚合物分子链断裂,分子量下降.Hydrothermal aging behavior of poly（butylene fumarate）（PBF） has been systematically studied in this article in order to evaluate the feasibility of PBF to be used as a biodegradable material.The variation of mechanical properties,thermal properties,molecular weight and chemical groups with the progress of aging has been investigated in detail by GPC,mechanical tests,DSC and ATR-FTIR.The results show that PBF possesses good aging resistance under natural condition.The mechanical properties vary little upon aging at 30 ℃ for 40 days.But the aging resistance of PBF decreases sharply with increasing temperature and the temperature greatly influences the aging behavior.With increasing the temperature to 60 ℃,the sample ages faster,and Mn decreases by about 50% upon degradation for 20 days.Further increasing temperature to 80 ℃,the sample ages very quickly,and Mndecreases to about 13% upon degradation for 5 days.No obvious change in content of C C double bonds and carboxyl index has been observed.The presence of C C double bonds is not the main cause of the aging of PBF and the aging mechanism is the plasticization and swelling of water,hydrolyzation of ester bonds,breakdown of polymer chains,and decrease of molecular weight.Obvious increase in crystallization temperature（3 ~ 18 K）,melting temperature（2 ~ 4 K）,and enthalpy（21% ~ 55%） of PBF upon aging can be found,arising from the chemical crystallization.

关 键 词：聚富马酸丁二酯 生物降解 老化 力学性能 热性能 

分 类 号：O631.21[理学—高分子化学]