Abstract
研究了不同组成的苯乙烯-丁二烯苯乙烯嵌段共聚物（SBS）的相形态与粘弹弛豫.用透射电子显微镜(TEM)表征了SBS的形态，结果显示，几种SBS均呈层状结构，随着苯乙烯含量的降低，聚苯乙烯（PS）相的尺寸稍有减小，而聚丁二烯（PB）相尺寸明显增大.用动态流变学方法考察了不同温度下SBS嵌段大分子的弛豫行为，结果表明，苯乙烯含量减少，PS相玻璃化转变和有序无序转变温度均降低；苯乙烯含量少的，在有序无序转变过程中呈现出高且宽的损耗峰，表明有序无序转变过程中能量的耗散主要由两相溶合时分子链间的内摩擦所决定，分子链越长，内摩擦越大，能量耗散越大.
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