苯乙烯和4-(甲基丙烯酸)2,2,6,6-四甲基哌啶醇酯共聚物与聚丙烯共混物流变性能和形态

RHEOLOGICAL PROPERTIES AND MORPHOLOGY OF POLYBLENDS OF POLYPROPYLENE AND A COPOLYMER OF STYRENE AND 2,2,6,6-TETRAMETHYL-4-PIPERRIDINYLMETHACRYLATE (PDS)

用毛细管流变仪和显微摄影方法以及稳定自由基标记法研究了苯乙烯和4-(甲基丙烯酸)2,2,6,6-四甲基哌啶醇酯(简称PDS)共聚物共混聚丙烯的流变性能和形态分布,发现PDS相于聚丙烯相中的分布呈典型的分散球状颗粒,颗粒尺寸与流动条件有关,两相的分布状况与PDS分子量大小有关。同时也探讨了PDS共混比例对熔体流动性能的影响。添加少量PDS可改善聚丙烯熔体的流动性能。

Bheological properties and morphology of the title polyblends were studied by using Instron capillary rheometer, examination of photomicrographs and labelling.It was found that the PDS is dispersed in the polypropylene as t separate phase of typically spherical globules, and that the particle size varies with shear rate of extrusion, length/diameter ratio of the capillary and molecular weight of the PDS.