La2O3/己二酸锌/聚甲基丙烯酸钙对PVC/ACS热稳定性的影响

摘要

improve the thermal stability of polyvinyl chloride (PVC)/acrylonitrile-chlorinated polyethylene-styrene copolymer (ACS) composites. The influences of La2O3/zinc adipate/poly(calcium methylacrylate)co-stabilizer on the thermal stability property of PVC/ACS blend were studied by Congo red testing method. The effects of adding La2O3 on plasticizing behavior, heat-resistance, dynamic mechanical property and mechanical properties of PVC/ACS at different mass ratios of Zn to Ca were tested. The results indicate that the thermal stability time, glass transition temperature and the mechanical properties are all increased after adding La2O3 at certain mass ratio of Zn to Ca. When the mass ratio of La2O3, zinc adipate and poly(calcium methacrylate)is 10∶6∶9, the thermal stability time reaches 215 min.%　　要： 为提高聚氯乙烯(PVC)/丙烯腈-氯化聚乙烯-苯乙烯共聚物(ACS)复合材料的加工热稳定性，制备了一种新型复合热稳定剂——氧化镧(La2O3)/己二酸锌/聚甲基丙烯酸钙对复合材料改性.用刚果红法研究了复合稳定剂对PVC/ACS热稳定性能的影响；用转矩流变仪、动态力学分析仪、冲击和拉伸试验机测定了不同m(Zn)/ m(Ca)时添加La2O3对PVC/ACS试样的塑化行为、耐热性、动态力学和力学性能的影响.结果表明：m(Zn)/m(Ca)一定，添加La2O3后，复合材料的热稳定时间延长，玻璃化转变温度、力学性能均有所提高.当La2O3/己二酸锌/聚甲基丙烯酸钙的质量比为10∶6∶9时热稳定时间最长，达215 min.