链转移剂单体α-甲基丙烯酸-3-巯基己酯对支化聚苯乙烯悬浮聚合的影响  

Synthesis of Branched Polystyrene via Suspension Polymerization in the Presence of Chain Transfer Monomer 3-Mercapto-Hexyl Methacrylate

作　　者：郭金龙[1] 黄文艳[1] 张俊[1] 薛小强[1] 杨宏军[1] 蒋必彪[1] 

机构地区：[1]常州大学材料科学与工程学院,江苏常州213164

出　　处：《高分子材料科学与工程》2013年第8期93-96,100,共5页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(21174020);常州市高分子材料重点实验室和江苏省优势学科资助项目

摘　　要：以α-甲基丙烯酸-3-巯基己酯(MHM)为链转移剂单体,偶氮二异丁腈(AIBN)为引发剂,采用悬浮聚合方法合成支化聚苯乙烯。考察了MHM和AIBN浓度对聚合反应的影响;采用核磁共振氢谱(1H-NMR)、三检测体积排除色谱(TD-SEC)和旋转流变仪对支化聚苯乙烯进行了表征分析。结果表明,当物质的量比n(AIBN)/n(MHM)>1时,可以避免交联制备相对分子质量分布相对较窄的高相对分子质量支化聚苯乙烯(-Mw.MALLS=1.03×106g/mol,PDI=7.76),其Zimm相对支化因子g′为0.51,表现出较高的支化程度;与同相对分子质量的线性聚合物相比较,合成的支化聚合物表现出很低的聚合物熔体黏度,同时未表现出明显的剪切变稀行为。Branched polystyrene was prepared through suspension polymerization using 3-mercapto-hexyl methacrylate（MHM） as the chain transfer monomer and 2,2′-Azobisisobutyronitrile（AIBN） as the initiator.The influence of MHM and AIBN concentration on polymerization was studied.The branched polystyrene was characterized by proton nuclear magnetic resonance（1H-NMR）,triple detection size exclusion chromatography（TD-SEC） and rotational rheometer.It was essential that the molar ratio of n（AIBN）/n（MHM） must be larger than 1.0 for soluble branched polymers.The branched polystyrene prepared by suspension polymerization shows higher branched degree（the average Zimm branched factor g′= 0.51）,high molecular weight and narrow molecular weight distribution（w.MALLS=1.03×106 g/mol,PDI=7.76）.Compared with linear polymers,branched polymers exhibit lower melt viscosity without obvious shear thinning behavior.

关 键 词：链转移剂单体 支化聚苯乙烯 悬浮聚合 

分 类 号：TQ325.2[化学工程—合成树脂塑料工业]