PBS基三元共聚物的合成及性能研究

Study on Synthesis and Properties of PBS-based Terpolymers

在PBS主链中同时引入己内酯(CL)和1,4-环己烷二甲醇(1,4-CHDM),或CL和二乙醇酸(DGA)得到了PBS-co-PCL-co-CHDM和PBS-co-PCL-co-DGA三元共聚物。通过1H-NMR、FTIR对三元共聚物的结构进行了表征,并采用热分析、广角X射线衍射分析和拉力试验比较了三元共聚物的性能。结果表明:随着CL、1,4-CHDM、DGA的引入,三元共聚物的结晶尺寸有所减小,结晶度降低,与PBS相比晶型略有变化;并且tanδ均增大,而储能模量均降低;在CL同时存在的条件下,1,4-CHDM的加入使共聚物的的玻璃化温度(Tg)上升为-30℃,DGA的加入却使Tg下降为-36℃,但二者的热分解温度仍在300℃以上;改性后三元共聚物的柔韧性增强断,裂伸长率显著提高。

Introducing ε-caprolactone（CL） and 1,4-cyclohexanedimethylene（1,4-CHDM）,or CL anddiglycolic acid（DGA） in the main chain of poly（butylene succinate）（PBS） to produce PBS-coPCL-co-CHDM and PBS-co-PCL-co-DGA terpolymers.The structures of the terpolymers wereidentified by 1H-NMR and FTIR.The properties of the terpolymers were investigated by thermalanalysis,WAXD and tensile strength testing.The results indicate that with the addition of CL,1,4-CHDM and DGA,the spherulite size and crystallinity of terpolymers decrease,the crystalform changes slightly compared with that of pure PBS,tanδ increases,while storage modulusdecreases;in the presence of CL,the addition of 1,4-CHDM increases the T g of PBS-co-PCL-coCHDM to-30 ℃,while the addition of DGA decreases the T g of PBS-co-PCL-co-DGA to-36 ℃,butthe decomposition temperatures of both terpolymers are above 300 ℃;the flexibility of the terpolymersis improved,and the elongation at break also increases obviously.