用ＳＡＸＳ法和偏光显微镜研究了ＰＴＭＰＳ均聚物和ＰＴＭＰＳＤＭＳ多嵌段共聚物熔体结晶的亚微观结构．结果表明ＰＴＭＰＳ和ＰＴＭＰＳＤＭＳ的亚微观结构参数，和球晶形态、晶体界面自由能表观积及基本物性参数等存在密切相关性．当ＤＭＳ含量为５０％时亚微观结构参数均显示一个转折变化过程，此时，球晶形态、晶体界面自由能、熔点、玻璃化温度和结晶度指数亦呈现一个突变过程． The SAXS method and polarized microscope were used to study the submicroscopic structures of PTMPS homopolymer and PTMPSDMS multiblock copolymers. The results show that the submicroscopic structure parameters of PTMPS and PTMPSDMS are closely related to the spherulite morphology, the free surface energy of crystal interface and the basic physical parameters. When the content of DMS is 50%, the submicroscopic structure parameters all show a transition process. At this time, the spherulite morphology, the free energy of the crystal interface, the melting point, the glass transition temperature and the crystallinity index also show a mutation process.