不同结构苯乙烯-乙烯-丁烯-苯乙烯嵌段共聚物的性能研究  

Study on Properties of SEBS with Different Structures

作　　者：方辉 FANG Hui(Sinopec Hunan Petrochemical Co.,Ltd,Yueyang 414014,China)

机构地区：[1]中石化湖南石油化工有限公司橡胶部,湖南岳阳414014

出　　处：《橡胶工业》2025年第3期177-184,共8页China Rubber Industry

摘　　要：研究不同结构苯乙烯-乙烯-丁烯-苯乙烯嵌段共聚物(SEBS)的性能。结果表明:常规SEBS YH-503和YH-602的加工流动性差;在加入聚丙烯的条件下,线性结构充油YH-503的拉伸强度较大,适用于要求强度较高的制品,星形结构充油YH-602的弹性和加工性能较好,适用于弹性要求较高的制品;苯乙烯-丁二烯-苯乙烯嵌段共聚物氢化前聚丁二烯链段高1,2-结构含量(高于60%)的SEBS的拉伸强度适中、弹性好、熔体流动速率较大,无需充油即可加工应用;分子中间链段苯乙烯与丁二烯无规共聚的SEBS的硬度和拉伸强度较大,熔体流动性和透明性优良,与无机填料和有机极性材料相容性好;随着苯乙烯单体含量升高,分子链两端不含聚苯乙烯嵌段的氢化苯乙烯-丁二烯无规共聚物的SEBS的拉伸强度和拉断永久变形减小,该结构SEBS/乙烯-醋酸乙烯共聚物发泡材料具有高弹性、压缩变形和热收缩率小的特点。The properties of styrene-ethylene-butene-styrene block copolymers(SEBS)with different structures were studied.The results indicated that the processing flowability of conventional SEBS YH-503 and YH-602 was poor.Under the condition of adding polypropylene,the linear structure oil-extended YH-503 had a higher tensile strength,making it suitable for products with higher strength requirements.The star-shaped structure oil-extended YH-602 showed good elasticity and processing performance,making it more appropriate for products with high elasticity requirements.SEBS with high 1,2-structure contents(greater than 60%)of the pre-hydrogenated polybutadiene segments of styrene-butadiene-styrene block copolymers exhibited moderate tensile strength,good elasticity and high melt flow rate,enabling its application without oil filling.SEBS with random copolymerization of styrene and butadiene in the molecular middle chain segments had large hardness and tensile strength,excellent melt flowability and transparency,and good compatibility with inorganic fillers and organic polar materials.As the styrene monomer content increased,the tensile strength and permanent set at break of SEBS of hydrogenated styrene-butadiene random copolymer without polystyrene blocks at both ends of the molecular chain decreased.SEBS/ethylene-vinyl acetate copolymer foam materia displayed high elasticity,small compression deformation and low thermal shrinkage rate.

关 键 词：苯乙烯-乙烯-丁烯-苯乙烯嵌段共聚物 分子结构 拉伸性能 熔体流动速率 

分 类 号：TQ334.2[化学工程—橡胶工业]