14.的1国家电网公司输变电工程标准化施工作业手册_变电工程分册.pdf

1 摘要||llIII I[11[IIII# j Y19 11382箩本文采用不同改性方法制备回收聚丙烯(Ⅺ)P)与PVC共混材料,并研究了RPP/PVC共混材料的结构与性能。采用***化聚乙烯(CPE)和乙烯.***丙烯酸甲酯共聚物(EMMA) 作为增容剂制备了RPP/PVC共混材料。利用微控电子万能试验机、电子冲击实验机测试了不同增容剂含量及不同RPP含量对共混材料的力学性能的影响;利用差示扫描量热仪(DSC)和扫描电镜(SEM) 表征了共混材料两相之间的相容性和形态结构。力学性能试验结果表明,增容剂CPE或EMMA可显著提高RPP/PVC(10/100)共混材料的力学性能。DSC结果表明,CPE或EMMA能有效的提高I冲P/PVC (10/100)共混材料的相容性,EMMA对RPP/PVC(10/100)共混体系的增容效果优于CPE。SEM结果表明,RPP/PVC(10/100)共混材料中RPP是分散相,PVC是连续相,分散相RPP以颗粒状形式分散在PVC基体中形成“"结构。未增容共混材料中RPP与PVC 有明显的相界面,且分散颗粒大而不均匀,是不相容体系;共混材料经CPE或EMMA增容后,RPP与PVC之间的相界面变得模糊,分散相颗粒小而均匀。先将CPE和EMMA与RPP进行交联共混制备RPP/CPE交联物和RPP/EMMA交联物,然后将交联物与PVC共混制备共混材料,研究RPP交联物和共混材料的结构和性能。DSC结果表明,RPP与CPE 或EMMA交联处理后,其结晶度相对RPP结晶度明显下降,比较 RPP/CPE交联物和RPP/EMMA交联物的结晶度,RPP/EMMA交联物的结晶度下降趋势更为显著。考察了RPP交联物的三种制备工艺对共混材料性能的影响,结果表明采用工艺③制备的RPP交联物与 PVC共混制备的(RPP/CPE(EMMA)交联物):evc共混材料的性能比其它两种工艺制备的共混材料的性能好。力学性能研究结果表明,将 RPP与CPE或EMMA进行交联处理后与PVC共混的方法可以显著改善共混材料的力学性能;综合比较两种交联物与PVC共混材料的各项性能,EMMA增容交联改性的RPP/PVC共混材料性能优于CPE 增容交联改性的共混材料。DSC和SEM结果表明,RPP/CPE交联物和RPP/EMMA交联物与PVC是部分相容体系;RPP/PVC共混材料中分散相RPP与PVC之间存在明显的相界面,分散相大小不均匀; (I冲P/CPE交联物)/PVC共混材料和(RPP/EMMA交联物)/PVC 共混材料中RPP分散均匀,尺寸较小,与PVC之间的相界面变得模糊。关键词:共混,回收聚丙烯,聚***乙烯,增容,交联 II ABSTRACT, Recycled polypropylene(RPP)/PVC blends were prepared by three differentmethods,morphology andproperties ofRPP/PVC blends were studied. RPP/PVC blends using chlorinated polyethylene(CPE) or ethylene‘methyl methacrylate copolymer(EMMA)as acompatibilizer were of CPE contents,EMMA contents and RPP contents onthemechanicalproperties ofRPP/PVC blends were studied using micro。controlled electronic universal testing machine and electronicimpacttesting andmorphology of RPP/PVC blends were characterized using differential scanning calorimeter(DSC)and scanning electron microscopy(SEM).The experimental results of mechanical properties showed that the mechanical properties ofI冲P伊VC(1 0/100)blends were significantly improved due totheadditionofCPE orEMMA as experimental results of DSC indicated that patibili