聚ε-己内酯对聚乳酸/聚丁二酸丁二醇酯共混体系性能的影响

Effects of Poly(ε-caprolactone) on the Properties of Poly(lactic acid)/Poly(butylene succinate) Blends

通过熔融共混法制备了不同聚ε-己内酯含量的聚乳酸/聚丁二酸丁二醇酯/聚ε-己内酯(PLA/PBS/PCL)共混物,采用X射线衍射仪、热重分析仪、流变仪和万能试验机等对PLA/PBS/PCL共混体系的结晶性能、热稳定性、流变行为和力学性能进行了研究。结果表明,PCL的加入未改变共混物的结晶结构;加入PCL后,共混物的起始分解温度(Ti)和分解终止温度(Tf)显著提高,当PCL用量为3 phr时,共混物的Ti和Tf分别提高了27.14℃和23.31℃;当PCL用量不超过2 phr时,PCL对共混体系主要起增容作用,PLA与PBS之间的相容性得到改善;随着PCL用量的增加,共混物的拉伸强度呈先增加后减小的趋势,PCL用量为2 phr时,达到最大值69.3 MPa,冲击强度呈增加的趋势,PCL用量为3 phr时,达到最大值5.59 k J/m2,较PLA/PBS共混物分别增加了35.4%和76.9%。

Poly（lactic acid）/poly（butylene succinate）/poly（ε-caprolactone）（PLA/PBS/PCL） blends with different poly（ε-caprolactone）（PCL） contents（PCL content） were prepared by melt blending. And the crystallization property,thermal stability,rheological behavior and mechanical properties of PLA/PBS/PCL blends were studied by XRD,TG,rheometer and universal testing machine. The results show that the addition of PCL does not change the crystal structure of the blends; after addition of PCL,the initial decomposition temperature（Ti） and decomposition termination temperature（Tf） of the blends increase significantly,and when the PCL content is equal to 3 phr,Tiand Tfof the blends are increased by 27.14 ℃ and 23.31 ℃,respectively; and when the PCL content is less than or equal to 2 phr,PCL can improve the compatibility of blends,the comptibility between PLA and PBS is improved; and with the increase of PCL content,the tensile strength of the blends increases firstly and then decreases,when the PCL content is equal to2 phr,it reaches the maximum value of 69.3 MPa,the impact strength of the blends is increased and when the PCL content is equal to 3 phr,it reaches the maximum value of 5.59 k J/m2,they are increased by 35.4% and 76.9% compared with PLA/PBS blends,respectively.