PP/PMMA/PP-g-MAH共混物的结晶和相形态研究

采用偏光显微镜和相差显微镜详细研究PP/PMMA不相容聚合物共混物体系和PP/PMMA/PP-g-PMMA增容共混体系的结晶和相形态.偏光显微照片的研究结果表明,增容剂PP-g-MAH中PP结晶需要克服更多的能垒,导致PP结晶形态变得不完善,球晶尺寸变小.比较PP/PMMA和PP/PMMA/PP-g-MAH的相差显微照片可以看出,由于增容剂的加入,PP与PMMA相之间的界面变得模糊,两相的相容性变好.随着PP-g-MAH中MAH接枝率的增加,PMMA分散相的尺寸减小且变得均匀;当增容剂的接枝率为2.41%,添加的质量分数为4.71%,PP/PMMA共混体系中PMMA分散相的相?尺寸可达最小.PP-g-MAH作为反应型增容剂,一方面与PP在界面区域产生共晶;另一方面,MAH极性基团与PMMA的极性基团间产生的强的化学键合作用,使得界面区域的PP-g-MAH分子采取有利于降低构象熵的构象来起到增容作用.PP/PMMA共混物在130℃等温结晶的结果显示,PMMA相对PP的结晶形态的影响较小,PP结晶呈现典型的均相成核特征.PP/PMMA共混体系中加入PP-g-MAH,PP结晶尺寸减少.与非等温结晶相比,等温结晶的PP/PMMA共混物中PMMA相区尺寸明显偏大.

CRYSTALLIZATION AND PHASE MORPHOLOGY OF PP/PMMA/PP-g-MAH BLENDS

The crystallization and the phase morphology of polypropylene/poly(methy methacrylate)(PP/PMMA) incompatible blends were studied by using polarizing microscopy and discrepancy microscopy.Polypropylene-g-malaie anhydride(PP-g-MAH) was used as a compatibilizer for PP/PMMA blends,the results from the polarized micrographs showed that PP crystalline form became incomplete and PP crystal size decreased because of the crystallization of PP conquering more energy barrier.The results showed that the compatibility o...