星形支化结构苯乙烯-丁二烯-苯乙烯共聚物的分子设计、合成及表征  

Molecular design,synthesis and characterization of star-branched styrene-butadiene-styrene copolymer

作　　者：张素瑜 赵忠夫 吕航 刘旭 张春庆[1] ZHANG Su-yu;ZHAO Zhong-fu;Lü Hang;LIU Xu;ZHANG Chun-qing(Department of Polymer Science and Engineering,School of Chemical Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学化工学院高分子材料系,辽宁大连116024

出　　处：《合成橡胶工业》2021年第6期421-428,共8页China Synthetic Rubber Industry

基　　金：国家自然科学基金资助项目(51673034);中央高校基本科研业务费资助项目(DUT 14 ZD 223)。

摘　　要：以苯乙烯和对乙烯基苄氯为原料,采用活性负离子聚合技术合成末端含有可聚合乙烯基的聚苯乙烯大分子单体,并以此大分子单体与丁二烯进行活性负离子共聚合,再以二乙烯基苯为偶联剂使得所制备的活性聚合物发生偶联反应,设计并合成出以聚苯乙烯为规整支链的星形支化结构苯乙烯-丁二烯-苯乙烯共聚物(S-g-SBS),使用核磁共振波谱仪、凝胶渗透色谱仪、差示扫描量热仪等对所制备聚合物的化学组成、微观结构、分子量及其分布进行了表征,并对其流变性能进行了研究。结果表明,聚苯乙烯大分子单体分子量可控且分子量分布窄;S-g-SBS中聚丁二烯链段1,2-结构质量分数在30%~70%可控,且聚合物中1,2-结构含量越低,其熔体黏度亦越低;与相似分子结构参数的线型苯乙烯-丁二烯-苯乙烯嵌段共聚物相比,S-g-SBS的熔体黏度明显更低。A series of polystyrene macromonomers were synthesized by living anionic polymerization technique using styrene as monomer and p-vinylbenzyl chloride as capping agent.The star-branched styrene-butadiene-styrene(S-g-SBS)copolymer with ordered polystyrene as side chains was designed and synthesized using butadiene and polystyrene macromonomer as monomers and divinyl benzene as coupling agent.The chemical constitution and microstructure of polystyrene macromonomers and S-g-SBS were characterized by proton nuclear magnetic resonance spectrometer,gel permeation chromatographer and differential scanning calorimeter,and the rheological properties of S-g-SBS were analyzed by rotational rheometer.The results showed that polystyrene macromonomers with controlled molecular weight and narrow molecular weight distribution were obtained.The content of 1,2-structure of polybutadiene in S-g-SBS could be regulated between 30%and 70%,and the lower the content of 1,2-structure,the lower the melt viscosity.For the similar molecular structural parameter,the melt viscosity of S-g-SBS was obviously lower than that of linear SBS.

关 键 词：活性负离子聚合 聚苯乙烯大分子单体 星形支化结构 苯乙烯-丁二烯-苯乙烯共聚物 流变性能 熔体黏度 

分 类 号：TQ334.3[化学工程—橡胶工业]