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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。
In this paper, the glass transition and the micro-phase separation behavior of polystyrene-polyisoprene diblock copolymers with different morphologies were systematically investigated by DSC. The results show that the glass transition temperature T_ (g1) of PI phase is higher than that of pure PI, and slightly increases with the decrease of PI block. The block copolymers composed of PS with high PS content T_ (g1) is lower than the T_ (g1) of the block copolymer composed of PI (low PS content), the glass transition temperature T_ (g2) of the PS phase is lower than that of pure PS, and varies with the PS block molecular weight . The T_ (g2) of the block copolymers with PS matrix (high PS content) is higher than T_ (g2) of the block copolymers with white PI matrix (low PS content). The above experimental facts can be explained by the interaction between the PS and PI segments connected by chemical chains in the interface of the phase separation region and their influence on the movement of PS and PI segments.