文献类型：期刊文献

中文题名：乙烯-甲基丙烯酸甲酯共聚物结构的^(1)H NMR和^(13)C NMR表征

英文题名：Characterization on Copolymer Structure of Ethylene and Methyl Methacrylate by^(1)H NMR and^(13)C NMR

作者：张丹枫[1];喻国聪[1]

机构：[1]华东理工大学材料科学与工程学院,上海市先进聚合物材料重点实验室,上海200237

年份：2018

卷号：37

期号：6

起止页码：734

中文期刊名：分析测试学报

外文期刊名：Journal of Instrumental Analysis

收录：CSTPCD;;北大核心:【北大核心2017】；CSCD:【CSCD2017_2018】；

基金：上海市重点学科和重点实验室项目(WD1014050-4)

语种：中文

中文关键词：核磁共振(NMR);乙烯-甲基丙烯酸甲酯共聚物(EMMA);微观结构;表征

外文关键词：nuclear magnetic resonance(NMR);ethylene and methyl methacrylate copolymer(EM-MA);microstructures;characterization

摘要：采用核磁共振(^(1)HNMR、^(13)C NMR)技术对由双[N-(2,6-二异丙基苯基)-3-异丙基水杨醛亚胺]镍(Ⅱ)配合物/甲基铝氧烷(Methylaluminoxane,MAO)催化乙烯-甲基丙烯酸甲酯共聚得到的共聚物(EMMA-a)的微观结构和组成进行了详细的分析与表征,同时对自由基聚合制得的乙烯-甲基丙烯酸甲酯共聚物(EMMA-b)作了相应的分析与表征。通过^(1)HNMR数据,计算得到两种共聚物样品中共聚单体甲基丙烯酸甲酯(MMA)的插入率分别为14.10%和10.26%(摩尔百分数)。基于^(13)C NMR数据,分析比较了由配位共聚与自由基共聚所得共聚物样品在微观结构上的区别,结果发现,在共聚物的乙烯链段部分,由配位共聚得到的共聚物样品EMMA-a主要含有甲基型支链,而由自由基共聚所得共聚物样品EMMA-b具有长链型支链。另外,在共聚物的MMA链节部分,EMMA-a中的MMA单元的羰基(C‖O)碳的化学位移为177.27,而EMMA-b中的MMA单元的羰基(C‖O)碳的化学位移为175.96。
The microstructure and composition of ethylene and methyl methacrylate copolymer(EMMA-a),obtained with bis[N-(2,6-diisopropylphenyl)-3-isopropylsalicylaldiminate]-nickel(Ⅱ)/methylaluminoxane(MAO),were fully characterized by^(1)H NMR and^(13)C NMR techniques.The copolymer(EMMA-b)of ethylene and methyl methacrylate,produced by radical polymerization,also experienced the corresponding characterization.According to the^(1)H NMR data,the corporations of the co-unit MMA in the two copolymers were calculated to be 14.10%and 10.26%,respectively.Based on the^(13)C NMR data,the microstructures of the two copolymers were compared.The results showed that in the ethylene co-units,methyl-type branches mainly appeared in the EMMA-a,while long-chain branches were found in the EMMA-b.Besides,in the MMA co-units,the chemical shift of carbon in carbonyl(C‖O)of EMMA-a was found as 177.27,while the chemical shift of carbon in carbonyl(C‖O)of EMMA-b was 175.96.