用基本断裂功方法表征聚合物基纳米复合材料的韧性

Charactrization of Polymer Based Nano-Composites by Essential Work of Fracture(EWF) Method

将基本断裂功(EWF)方法成功地拓展应用于表征聚丙烯(PP)/纳米CaCO3二元共混体系、PP/乙烯-1-辛烯共聚物(POE)二元共混体系以及PP/POE/纳米CaCO3三元共混体系的冲击韧性。在PP/纳米CaCO3共混体系中,比基本断裂功(we)随着纳米CaCO3的加入而增加。在PP/POE共混体系中,we随POE的加入先减至最小值,而后大幅增加。在PP/POE/纳米CaCO3三元共混体系中,纳米CaCO3使we有进一步提高。并对不同体系共混物的不同βwp所揭示的断裂过程塑性形变机理进行了初步探讨。

Essential work of fracture （EWF） methodology was successfully extended to the impact toughness characterization of polypropylene（ PP）/nano-CaCO3 binary blends, PP/ethylene-1-octene copolymer （POE） binary blends and PP/POE/nano-CaCO3 ternary blends. It was shown that the we of PP/nano-CaCO3 blends increased with the incorporation of nano-CaCO3 into PP. While for PP/POE blends,we was decreased to its minimun and then increased with the addition of POE. For PP/POE/nano-CaCO3 blends, we was further increased. The mechanisms for plastic deformation revealed by βWp of different blends were preliminarily discussed.