界面强度对玻璃微珠填充聚丙烯力学性能的影响

本文针对玻璃微珠填充聚丙烯这一刚性粒子填充聚合物复合体系进行了实验研究。通过偶联剂改性对比,研究了该聚合物复合材料在不同界面粘结状态下的宏观拉伸、冲击力学性能。此外,根据冲击破坏断面的电镜观测结果,发现复合体系的断裂和增韧机制随界面粘结强度不同而发生改变,界面改性使得材料抗冲击破坏能力得到增强。本文还采用在位拉伸过程中的细观观测方法,观测到材料在一维应力作用下,刚性粒子和基体界面的脱粘、开裂过程,分析了该复合体系细观结构和宏观力学性能之间的关系,发现界面改性对于材料细观结构的界面脱粘和宏观屈服现象的重要影响,为发展新型复合材料提供了实验依据。

Experimental Analysis of Mechanical Properties about the Glass Bead-filled Polypropylene

The properties of rigid particle filled polymers,glass bead-filled polypropylene with different interfacial designs are studied through experiments.The interfacial modification is achieved by the application of coupling agent to improve the interfacial intensity between the particle and the polymer matrix phases.Firstly,tensile and impact experiments are carried out,the mechanical performances before and after the interfacial modification are compared.In addition,based on the SEM observation,discussions on the failure and toughening mechanism of the composites are presented,which betrays that the destructing mode of the composite varies with different interface intensities,and the modification gives rise to the dynamic fracture resistant ability.Then the relations between mesoscopic structures and the macro tensile behaviors are investigated by the one dimensional in situ tension experiments.It is proved that the employment of interfacial modifier has an important influence on the interface debonding in the mesoscopic point of view as well as the macroscopic yielding process of the material.The experimental results of this paper provide a significant guidance for developing new polymer composites.