中文摘要：

采用动态力学分析仪（DMA）、透射电子显微镜（TEM）分析了聚丙烯一磬聚氨酯（PP-g-PU）共聚物的形态结构，发现各接枝物均出现微相分离，分散相分布于PP的非晶区，分散相的大小、分布及形状与接枝物的支链的长度和分布密度密切相关；由接枝物的偏光显微镜（POLM）照片可见，结晶对其微相分离也产生一定影响。结果表明，当PU支链分子量为2361，PU含量在20％以内的接枝物，其分散相以小微粒的形式均匀分散于PP连续相中，两相界面处可以观察到较为清晰的界面相，两相间具有较好的相容性。

英文摘要：

The microstructure and morphology of polypropylene grafted with polyurethane （PP-g-PU） copolymer have been investigated by dynamic mechanical thermal analysis （DMTA）, transmission electron microscopy （TEM） and polarized light optical microscopy （PLOM）. It is shown that the microphase-separated structure of the PP-g-PU copolymer is consist of continuous domain formed by the polypropylene （PP） component and dispersed domains of polyurethane （PU）. A complex microstructure was observed for the dispersed phase, which was believed to be formed by the hard segments and soft segments of the PU branches. The microstructure and morphology were also affected by the length of PU chains, the content of PU and the crystallization process of the copolymer.