剪切历史和玻璃纤维含量对PC-GF复合材料动态流变行为的影响

摘要

The dynamic rheological properties of glass fiber reinfoyced polycarbonate (PC-GF)composites in the conditions of different injection velocities and different glass fiber contents were investigated through injection molding and rheological experiments.The results show that under low injection speed,shear will improve the stability of the internal network structure of the composite material to increase the modulus and viscosity of the composites.And at a high injection speed,the strong shearing to break the glass fiber and the inability of glass fibers to form a network result in a significant drop in the modulus and viscosity of the composites.A small amount of glass fiber can reduce the adhesion between the molecular chains to decrease the viscosity.By increasing the content of glass fiber (more than 12％),glass fiber will form a network structure to limit the molecular chain movement so that the modulus and viscosity increase.%通过注塑和流变实验研究了不同注射速度和不同玻璃纤维含量的玻璃纤维增强聚碳酸酯(PC-GF)复合材料的动态流变性能.结果表明,低注射速度下,剪切使材料的内部网络结构更稳定,模量和黏度均有上升的趋势;在高注射速度下剪切使玻璃纤维发生断裂而无法形成网络导致模量和黏度下降明显.少量的玻璃纤维可以降低分子链间的黏合性,降低本身黏度较高的PC材料的黏度,而当含量较高时(大于12％),玻璃纤维自身易形成网络结构,限制分子链运动使模量和黏度上升.