正离子聚合制备异丁烯-对甲基苯乙烯无规共聚物及其溴化反应  

Preparation of isobutylene-methyl styrene random copolymer by cationic polymerization method and its bromination reaction

作　　者：李晶 田英鑫 周军伟 赵龑浩 魏绪玲 燕鹏华 龚光碧 伍一波 TIAN Ying-xin;ZHOU Jun-wei;ZHAO Yan-hao;WEI Xu-ling;YAN Peng-hua;GONG Guang-bi;WU Yi-bo(Lanzhou Petrochemical Research Center,Petrochemical Research Institute,PetroChina,Lanzhou 730060,China;College of Materials Science and Engineering,Beijing University of Chemical and Technology,Beijing 100029,China;Beijing Key Laboratory of Special Elastomeric Composite Materials,Department of Materials Science and Chemical Engineering,Beijing Institute of Petrochemical Technology,Beijing 102617,China)

机构地区：[1]中国石油石油化工研究院兰州化工研究中心,兰州730060 [2]北京化工大学材料科学与工程学院,北京100029 [3]北京石油化工学院材料科学与工程学院特种弹性体复合材料北京市重点实验室,北京102617

出　　处：《合成橡胶工业》2018年第5期356-361,共6页China Synthetic Rubber Industry

基　　金：国家重点研发计划资助项目(2017 YFB 0307100);国家自然科学基金资助项目(51573020);北京市自然基金资助项目(2172022)

摘　　要：通过正离子聚合法制备了异丁烯-对甲基苯乙烯无规共聚物,考察了单体浓度、聚合温度以及聚合时间对正离子聚合的影响,并通过光照溴化反应对共聚物进行溴化改性,制备出主链结构完全饱和的溴化异丁烯-对甲基苯乙烯无规共聚物(BIMS),对其结构与性能进行了表征。结果表明,在-80℃、单体质量分数为25%～28%时,异丁烯与对甲基苯乙烯正离子共聚合,聚合物的数均分子量可达2.1×10~5。随着温度的降低,聚合物的数均分子量增大,分子量分布变窄。随着溴含量的增加,BMIS中苄基溴含量也增加,当溴质量分数为1.9%时,聚合物中苄基溴摩尔分数达到1.38%。BIMS热稳定性较好,在较低的温度下仍能保持橡胶的高弹性,且耐热氧老化性能优异。Isobutylene-p-methylstyrene random copolymers were prepared by solution method of ca- tionic polymerization. Effects of concentration of monomer, polymerization temperature and polymeri- zation time on cationic polymerization were investiga- ted. Brominated modification of the copolymers was modified by bromination under light. Brominated isobutylene-p-methylstyrene random copolymer （BIMS） with complete saturation main chain was prepared, and the structure and properties of BIMS were characterized. The results showed that isobuty- lene copolymerized with P-methylstyrene, and the number-average molecular weight of the polymer could reach 2. 1×10^5 , when the mass fraction of themonomer was 25% -28% at -80℃. The number- average molar mass of the polymer increased and molecular weight distribution narrowed, With the decrease of temperature. The content of benzyl bromide in BMIS increased, with the increase of bromine concentration. When the mass fraction of bromine was 1.9% , the mole fraction of benzyl bro- mide in the polymer was 1.38%. BIMS had good thermal stability, and could maintain high elasticity of rubber at low temperature and excellent heat- resistant oxygen aging properties.

关 键 词：正离子聚合 无规共聚物 异丁烯 对甲基苯乙烯 自由基取代反应 

分 类 号：TQ333.8[化学工程—橡胶工业]