共混合金力学性能的研究 Ⅲ.CPP对PVC共混体系力学性能的影响

STUDY ON THE MECHANICAL BEHAVIOR OF PVC ALLOYS Ⅲ.EFFECT OF CPP ON THE MECHANICAL BEHAVIOR Of PVC ALLOYS

将ＰＰ氯化后作为ＰＶＣ共混体系的刚性体分散相，旨在改善高分子合金的相容性，ＤＳＣ实验表明，ＣＰＰ（氯化聚丙烯）与ＰＶＣ的相容性比ＰＶＣ与ＰＰ的好。在用弹性体增韧的ＰＶＣ／ＣＰＥ和ＰＶＣ／ＡＢＳ共混体系中加入刚性体ＣＰＰ后，随着ＣＰＥ、ＡＢＳ用量的增加，共混合金的冲击强度增加，并且由刚性的ＣＰＰ的加入所产生的冲击强度最大值的幅度也有所提高，其趋势是ＣＰＥ、ＡＢＳ用量越多，共混合金冲击强度值达到最大值时所需ＣＰＰ的量越多，增加的幅度也越大。ＣＰＰ对共混合金的拉伸屈服强度和断裂伸长率的影响比较小。

To improve the compatibility of PVC with PP, the PP is chlorided. It is shown that by DSC, CPP has better compatibility with PVC than PP. When CPP incorparted in PVC/CPE、PVC/ABS blends system, the mechanical behavior of the PVC alloys would change. The impact strength and the maximal impact strength set up by rigid dispersed phase CPP of the PVC alloys all increase as the content of CPE or ABS increasing. The more is the content of CPE or ABS, the highest the maximal impact strength. It is also shown that the CPE or ABS acts on both compatibility and toughening agent in this polymer system. The tensile yield strength and rupture elongation of PVC alloys do not decrease as the content of CPP increasing.