HDPE-g-GMA增容PC/UHMWPE共混体系的形态结构和动态流变性能

Morphological Structure and Dynamic Rheology of PC/UHMWPE Blends Compatibilized with HDPE-g-GMA

采用扫描电镜和动态流变仪研究了PC/UHMWPE/HDPE g GMA(GMA :甲基丙烯酸缩水甘油酯 )共混物的微观形态结构和增容剂HDPE g GMA及UHMWPE对共混物动态流变性能的影响 ,分析了微观形态与动态流变性能之间的关系。当UHMWPE用量低于 4g时 (PC用量为 10 0g ,m(增容剂 )∶m(UHMWPE) =1∶1 5 ,下同 ) ,分散相分布均匀 ;当其用量大于 4g时 ,分散相尺寸有所增大。随着剪切频率的增加 ,共混物的复模量降低 ,损耗因子先增加然后减小。UHMWPE和增容剂的最佳用量分别为 4和 6g ,此时增容剂在界面达到饱和 ,分散相达到最佳分布状态 ,共混物复模量最高 ,内耗峰低移至 2Hz。

Morphological structures of PC/UHMWPE blends were observed by SEM and their dynamic rheology was studied with a dynamic rheometer. The relationship between the morphological structure and the dynamic rheology behavior of the blends is discussed. The size distribution of the dispersion domains of compatibilized blends(PC content was maintained at 100 g) was uniform when the mass ratio of UHMWPE to compatibilizer HDPE-g-GMA was 1∶1.5 and UHMWPE content was less than 4 g. However, the size of the dispersion domains increased when the UHMWPE content was greater than 4 g. The complex moduli of the blends decreased with the increase of shear frequency, and their tanδ first increased, then decreased. The blend containing 4 g UHMWPE and 6 g compatibilizer had the maximal modulus, uniform distribution of dispersion domains and the loss peak shifted to 2 Hz.