两步共混工艺制备聚碳酸酯/聚丙烯/针状硅酸盐三元纳米复合材料:降解与形态

1 INTRODUCTION Polycarbonate (PC) is an important and widely used engineering thermoplastic, however, it exhibits high notch sensitivity and is susceptible to crazing or cracking on exposure to various solvents[1]. PC was modified in many different ways, particularly by blending with polyolefin resin such as polyethylene (PE), polypropylene (PP) for use in demanding appli- cations when its outstanding notched impact strength is important[2,3]. Unfortunately, the enhance of the toughness…

Polycarbonate/Polypropylene/Fibrillar Silicate Ternary Nanocomposites via Two-step Blending Process: Degradation and Morphology

The method of two-step melt blending was used to prepare polycarbonate/polypropylene/attapulgite ternary nanocomposite, and the various techniques including gel permeation chromatography, rheometer, transmission electron microscope, dynamic mechanical analysis were used to examine the degradation of polycarbonate (PC)and the nanocomposite morphology. The results showed that the molecular weight degradation of PC triggered by attapulgite (AT) during the direct blending process was inhibited effectively by using two-step melt blending, in which AT was blended with polypropylene (PP) prior to compound with PC. The morphology of encapsulation was formed in the PC matrix, where PP encapsulates AT fibrillar single crystals to form a core-shell inclusion. Dynamic mechanical analysis (DMA) measurements showed that the PC/PP/AT ternary nanocomposites were more effective than conventional PC/PP blends in reinforcement, meanwhile the addition of AT in the ternary nanocomposites shifted the glass transition temperature of the PP phase to a higher value.