CPE,CV及其与ACR,MBS复合增韧RPVC的研究

Study on Toughening and Compound Toughening of RPVC by CPE, CV and Combined with ACR or MBS

考察了不同ＣＰＥ牌号及用ＣＰＥ－ＰＶＣ接枝共聚物（ＣＶ）部分或全部代替ＣＰＥ对改善Ｒ－ＰＶＣ冲击和拉伸性能的影响，在此基础上，研究了复合增韧体系（ＣＰＥ、ＣＶ分别与ＡＣＲ、ＭＢＳ并用或ＣＰＥ、ＣＶ同时和ＡＣＲ并用等）对提高Ｒ－ＰＶＣ力学性能的影响。结果表明，ＣＰＥ的分子量高、氯含量分布窄和氯含量高、残余结晶度高分别对提高Ｒ－ＰＶＣ的冲击和拉伸强度有利；ＣＶ与ＣＰＥ并用能提高Ｒ－ＰＶＣ的冲击强度，并且拉伸强度的损失较单独使用ＣＰＥ为小，并用时其组成比以１１为宜；ＣＰＥ、ＣＶ与ＡＣＲ或ＭＢＳ联合使用，在适宜组成比下能对Ｒ－ＰＶＣ产生协同增韧效应，改善体系的相容性，提高冲击性能并保留较高的其它力学强度，这是解决目前ＰＶＣ／ＣＰＥ共混材料性能缺陷的有效方法。

The effects of different types of CPE and CPE PVC grafted copolymer (CV),which was a substitute or partial substitute for CPE,on the improvement of the impact strength and tensile strength of RPVC were studied.The effects of the compound toughening system(CPE and CV combined with ACR and MBS respectively or CPE/CV/ACR compounded system)on the improvement of the mechanical properties of RPVC were also studied.The results showed the high molecular weight,chlorinity and residual crystallinity,and the narrow chlorinity distribution of CPE were favorable to the improvement of impact strength and tensile strength of RPVC respectively.The combined use of CV and CPE could improve the impact strength of RPVC,and the loss of tensile strength was smaller than that when CV and CPE was used individually,the compounding ratio would better to be 1∶1,the combined use of CPE and CV with ACR or MBS under a certain ratio had a synergistic toughening effect on RPVC,improving the compatibility,increasing the impact strength and keeping other mechanical properties of the system unchanged,which was an efficient method for solving the property defects of PVC/CPE blend.