SMA-La离聚体的制备、表征及其对PVC的热稳定性能  

Preparation,Characterization of SMA-La Ionomer and the Application for PVC Thermal Stabilizer

作　　者：何志荣 温桦浩 罗越峰 王志强 廖正福[2] HE Zhirong;WEN Huahao;LUO Yuefeng;WANG Zhiqiang;LIAO Zhengfu(Institute of Analysis,Guangdong Academy of Sciences(China National Analytical Center,Guangzhou),Guangzhou,Guangdong 510070,China;College of Materials and Energy,Guangdong University of Technology,Guangzhou,Guangdong 510006,China;Guangdong Provincial Key Laboratory of Chemical M easurement and Emergency Test Technology,Guangzhou,Guangdong 510070,China)

机构地区：[1]广东省科学院测试分析研究所(中国广州分析测试中心),广东广州510070 [2]广东工业大学,材料与能源学院,广东广州510006 [3]广东省化学测量与应急检测技术重点实验室,广东广州510070

出　　处：《塑料》2024年第6期71-75,87,共6页Plastics

摘　　要：采用苯乙烯与马来酸酐的自由基溶液聚合,结合水解、碱化中和共聚物再离子交换的方法制备了一系列不同镧离子(La^(3+))含量的苯乙烯-co-马来酸镧离聚体(SMA-La)。采用傅里叶变换红外光谱(FTIR)、差示扫描量热(DSC)法对SMA-La离聚体结构进行了表征。利用EDTA滴定法测定了离聚体分子链上实际的La^(3+)含量,发现,进行离子交换时,滴加的溶液中,La^(3+)并未完全连接到SMA分子链上。利用刚果红变色试验分析了SMA-La离聚体对硬质PVC的静态热稳定作用及其与钙锌稳定剂的协同效应,同时研究了相应的作用机制。结果表明,含SMA-La离聚体是一种潜在的PVC热稳定剂,SMA-La离聚体通过配位、取代、消除及吸收等综合效应协同提高PVC的热稳定性。A series of styrene-co-lanthanum maleate ionomers(SMA-La)with different lanthanum ion(La^(3+))content were prepared and characterization.The process of preparation included 4 steps,i.e.copolymerization of styrene and maleic anhydride,hydrolysis of the copolymer,alkalization of the copolymer and ion exchange of Na^(+)and La^(3+).The structure of SMA-La were characterized by FTIR and DSC and the lanthanum ion(La^(3+))content of SMA-La ionomer was determined by titration method of EDTA,it was found that the lanthanum ion(La^(3+))content of the solution did not exhchange to the SMA chains completely.Meanwhile,the effect of static thermal stability of SMA-La ionomer and its synergistic effect with calcium zinc stabilizerits on polyvinyl chloride(PVC)were investigated by Congo red test,and the corresponding mechanism of action was discussed.The results suggested that SMA-La ionomer was a novel potent stabilizer for PVC and its derivatives,and SMA-La ionomer improved the thermal stability of PVC through the comprehensive effect of coordination,substitution,elimination and absorption.

关 键 词：含镧苯乙烯-co-马来酸离聚体(SMA-La) 聚氯乙烯 热稳定剂 制备 表征 稳定机制 

分 类 号：TQ325.3[化学工程—合成树脂塑料工业]