乙烯-丙烯酸及酯共聚物的结构研究  

Structural study of ethylene-acrylic acid and ester copolymers

作　　者：杜文博 沈禾雨 郭森 张悦[1] 刘振宇[1] 蒋文军[1] Du Wenbo;Shen Heyu;Guo Sen;Zhang Yue;Liu Zhenyu;Jiang Wenjun(Research Institute of Maoming Branch Company,SINOPEC,Maoming 525011,Guangdong,China)

机构地区：[1]中国石油化工股份有限公司茂名分公司研究院,广东茂名525011

出　　处：《中国胶粘剂》2024年第10期62-66,共5页China Adhesives

摘　　要：为进一步探究自由基聚合与配位共聚得到乙烯-丙烯酸甲酯共聚物的支链结构差异,并对该支链结构差异性的本质原因进行解释,本研究对进口的乙烯-丙烯酸及酯共聚物的熔点、熔指、分子量、极性单体插入率以及共聚物的微观链结构进行表征分析。研究结果表明:(1)乙烯-丙烯酸及酯共聚物熔点范围为64.1~98.4℃,熔融指数范围为2.81~10.50 g/10 min。EMA、EEA、EBA的重均分子量(Mw)都在20万左右,分子量分布(M_(w)/M_(n))小于5.0。(2)EMA共聚物中极性单体MA是以支链末端和主链两种形式并存于聚乙烯链上,其中以支链末端为主。MA在聚乙烯链中没有连续插入结构,MA主要以无规形式插入聚乙烯中。(3)进口的EMA共聚物是通过高温高压自由基聚合得到,EMA共聚物链中含有丁基、戊基以及长支链,而配位聚合得到的EMA共聚物含有甲基、乙基、丙基等短支链以及长支链。两种聚合方式得到EMA聚合物的微观链结构存在明显差异。In order to further investigate the differences in branched structure of ethylene-methyl acrylate copolymers obtained by free radical polymerization and coordination copolymerization,and to explain the essential reasons for the differences in branched structure,the melting point,melting index,molecular weight,polar monomer insertion rate,and micro chain structure of imported ethylene-acrylic acid and ester copolymers were characterized and analyzed in this study.The research results showed that,(1)The melting point range of ethylene-acrylic acid and ester copolymers was 64.1-98.4℃.The melting index range was 2.81-10.50 g/10 min.The average molecular weight(M_(w))of EMA,EEA and EBA was almost around 200000,and the molecular weight distribution(M_(w)/M_(n))was less than 5.0.(2)The polar monomer MA in EMA copolymers coexisted on the polyethylene chain in two forms:the branched end and the main chain,with the branched end being the main form.MA did not have a continuous insertion structure in polyethylene chains,and was mainly inserted into polyethylene in a random form.(3)The imported EMA copolymer was obtained through high-temperature and high-pressure free radical polymerization,and the EMA copolymer chain contained butyl,pentyl,and long branches,while the EMA copolymer obtained through coordination polymerization contained short and long branches such as methyl,ethyl,and propyl.There were significant differences in the micro chain structure of EMA polymers obtained by two polymerization methods.

关 键 词：乙烯-丙烯酸及酯共聚物 半结晶性 结构 表征 

分 类 号：TQ430.4[化学工程]