差示扫描量热法(DSC)研究聚苯乙烯-聚异戊二烯二嵌段共聚物的微相分离行为  

Microphase Separation Behavior of Polystyrene-Polyisoprene Diblock Copolymers Studied by DSC Technique

作　　者：徐种德[1] 黄妙玲[1] 卜路嘉[1] 万雨南 E.L.Thomas L.J.Fetters 

机构地区：[1]华东化工学院高分子化学与物理研究室 [2]University of Massachusetts [3]Exxon Research & Engineering Co

出　　处：《功能高分子学报》1989年第4期254-260,共7页Journal of Functional Polymers

摘　　要：本文采用 DSC技术,系统地研究了具有不同形态结构的聚苯乙烯-聚异戊二烯二嵌段共聚物的玻璃化转变及其微相分离行为。研究表明:PI相的玻璃化转变温度T_(g1)高于纯PI的T_g,并随PI嵌段子量的降低而略有升高;由PS组成基体(PS含量高)的嵌段共聚物的T_(g1)低于由PI组成基体(PS含量低)的嵌段共聚物的T_(g1),PS相的玻璃化转变温度T_(g2)低于纯PS的T_g,并随 PS嵌段分子量的降低而显著下降;由PS组成基体(PS含量高)的嵌段共聚物的T_(g2)高于白PI组成基体(PS含量低)的嵌段共聚物的T_(g2)。以上实验事实均可由在分相界面区内以化学链相连的PS与PI链段间的相互作用及其对PS与PI链段运动的影响予以解释。A series of PS--PI diblock copolymer samples with different molecular weights inthe range of 1.39×10~4 to 1.75×10~5 and different PS volume fraction in the range of23.7% to 72.6% were used for Tg measurements and microphase separation investiga-hon by DSC technique. The experimental results have been discussed and explained bythe strong interaction between the chemical bonded PS and PI segments at theinterfacial region. The microphase separation transition behavior have also been con-sidered in the explanation.

关 键 词：聚苯乙烯 聚异戊二烯 嵌段共聚物 

分 类 号：TQ325.2[化学工程—合成树脂塑料工业]