CaCO_3刚性粒子增韧HDPE的脆韧转变研究

STUDIES ON THE BRITTLE TOUGH TRANSITION IN HDPE/CaCO 3 BLENDS

研究了ＨＤＰＥ／ＣａＣＯ３填充体系中ＣａＣＯ３表面处理、粒径、含量及基体树脂分子量、结晶性与其材料缺口冲击强度、产生脆韧转变现象及基体晶态结构间的关系。结果表明，该共混体系中界面应力的应变诱导致结晶作用及其所引起的基体中伸展链晶体网络结构的形成是该材料实现脆韧转变的重要原因。

In this paper, the influence of the particle size, the particle size distribution, the content of CaCO 3 and their surface treated way and the matrix molecular weight, the crystallized capability of HDPE on the brittle tough transition of HDPE/CaCO 3 blends was investigated by using IR, DSC, SEM and material universal testing machine. The results show that the interfacial stress produced from the shrinkage of the matrix in the composites injection molding process can strain induced crystallization of the matrix and leads to the forming of the extended chain crystal network structure in the matrix, and the forming of extended chain crystal network structure in the matrix is the basic cause about the HDPE/CaCO 3 blends occuring the transition from brittle to tough fracture behavior.