PP/PC/PP-g-GMA共混物的结晶和相形态

Crystallization and Phase Morphology of PP/PC/PP-G-GMA Blends

采用偏光和相差显微镜详细研究了聚丙烯(PP)/聚碳酸酯(PC)不相容聚合物共混体系和PP/PC/PP-g-GMA增容共混体系的结晶和相形态。研究结果表明,PP/PC共混体系中增容剂PP-g-GMA中甲基丙烯酸缩水甘油酯(GMA)支链起到成核剂的作用,促进PP结晶异相成核,使得PP有效晶核密度增加,球晶尺寸减小;PC分散相分布密集且不均匀,平均尺寸相对较大,主要集中在8μm^10μm。随着PP-g-GMA中GMA接枝率的逐渐增加,PC分散相分布逐渐变得均匀且平均尺寸减小。当增容剂GMA的接枝率为3.51%,加入量为1.96%(质量分数,下同)时,PP/PC/PP-g-GMA共混体系中PC分散相尺寸减小且分布均匀,尺寸主要集中在1μm^2μm。

The crystallization and the phase morphology of propylene/polycarbonate（PP/PC） incompatible blends and PP/PC/ propylene-g-glycol methacrylate（PP-g-GMA） compatible blends were studied using polarized microscope and discrepancy microscope.The results show that PP crystal nucleus density is increased and PP spherulite dimension is decreased because GMA segments grafted PP used as nucleated agent promote the heterogeneous nucleating.Compared with the discrepancy micrographs of PP/PC and PP/PC/PP-g-GMA blends,the density of PC dispersions is high,and the diameter of PC dispersion is mostly distributed in 8 μm～10 μm.When GMA graft yield of PP-g-GMA is increased,the distribution of PC dispersion becomes uniform and the diameter of PC dispersion decreases.When the graft yield of PP-g-GMA is 3.51% and the concentration of PP-g-GMA in PP/PC/PP-g-GMA blends is 1.96%,the size of PC dispersed phase is averaged and small,the diameter of PC dispersion is mostly distributed in 1μm～2μm.