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以交联聚丙烯酸钠(PAAS)为吸水材料,通过动态硫化法制备了聚氯乙烯(PVC)/氯化聚乙烯橡胶(CM)热塑性硫化胶(TPV),并对其力学性能、微观相态结构及吸水行为进行了研究。结果表明,在实验范围内,PVC/PAAS/CM TPV呈现出典型弹性体软而韧的应力-应变行为。当PVC/PAAS/CM的共混比为30/60/70时,TPV表现出了良好的综合性能,在室温条件下的蒸馏水中浸渍200h,吸水膨胀率可达2 000%,且在吸水100h时,吸水速率出现了峰值,干燥后的TPV几乎无失重。由试样的显微镜照片可见,PAAS在基体中实现了均匀分散,PVC/PAAS/CM TPV的拉伸断裂面较粗糙,PAAS颗粒的较大尺寸及较低的界面结合导致了TPV的较低力学性能。
Polyvinyl chloride (PVC) / chlorinated polyethylene rubber (CM) thermoplastic vulcanizates (TPV) were prepared by dynamic vulcanization using crosslinked sodium polyacrylate (PAAS) as the water-absorbing material. The mechanical properties, microscopic phase Structure and water absorption behavior were studied. The results show that in the experimental range, PVC / PAAS / CM TPV exhibits the soft and tough stress-strain behavior of typical elastomers. When PVC / PAAS / CM blend ratio was 30/60/70, TPV showed good comprehensive properties. After being immersed in distilled water at room temperature for 200h, the swelling rate of water reached up to 2 000% , The water absorption rate peaked, and the TPV after drying showed almost no weight loss. As can be seen from the microscope photograph of the sample, the PAAS is uniformly dispersed in the matrix, the tensile fracture surface of the PVC / PAAS / CM TPV is rough, and the larger size and the lower interface of the PAAS particles lead to the lower mechanical performance.