聚氯乙烯/再生聚氨酯复合材料的动态力学性能及微观结构

Dynamic Mechanical Properties and Microstructure of Polyvinylchloride/Regenerated Rigid Polyurethane Composites

分别以四乙烯五胺(TEPA)、TEPA/二乙二醇(DEG)、三乙醇胺(TEA)为解交联剂制备了再生聚氨酯(RRPU),研究了不同解交联剂对解交联效果的影响。采用熔融共混法制备了PVC/RRPU复合材料,利用动态力学分析仪、扫描电镜研究了解交联剂的种类对复合材料力学性能以及微观形态的影响。研究表明,3种解交联剂解交联程度由大到小的顺序为TEPA>TEPA/DEG>TEA。以TEPA为解交联剂制备的PVC/RRPU复合材料综合性能较好。加入RRPU粉末后,复合材料的储能模量(E′)和玻璃化温度(Tg)都比纯PVC的有所提高。经TEPA处理所得到的RRPU和PVC复合材料冲击断面相界面粘接作用较好,拉伸断面中的撕裂拉扯现象最为明显,宏观上表现为力学性能较好。

Regenerated rigid polyurethane（RRPU） was prepared with tetraethylenepentamine（TEPA）,TEPA/diethylene glycol（DEG） and triethanolamine（TEA） as the decrosslinking agents.Polyvinylchloride（PVC）/RRPU composites were prepared by melt blending.Effect of decrosslinking agents on the mechanical properties and micro morphologies of composites were analyzed by dynamic mechanical analysis meter,scanning electron microscope.The results show that the decrosslingking degree order of the three agents is TEPATEPA/DEGTEA.PVC/RRPU composite decrosslinked with TEPA agent show the satisfying mechanical properties.With the addition of RRPU powder,the storage modulus（E′）and glass transition temperature（Tg） increase compared with those of pure PVC.A better phase interface adhesion could be seen in the impact fracture surface of PVC/RRPU composite treated with TEPA.The most obvious phenomena of fracture tearing could be observed in its tensile fracture surface.The composites exhibit better mechanical properties.