GF/PTT复合材料的力学性能和流变行为

Mechanical Properties and Rheology Behavior of GF/PTT Composites

采用扫描电子显微镜(SEM)和毛细管流变仪研究了玻璃纤维(GF)/聚对苯二甲酸丙二酯(PTT)复合材料的界面性能和流变行为。结果表明,材料断面较整齐,纤维与基体界面粘接牢固而拔出较少,表现出较强的整体承载负荷能力。部分暴露的GF表面仍附着大量树脂,说明纤维与基体间的界面粘接性能很好,GF的界面处理效果较好。复合材料熔体在剪切作用下为假塑性流体,表观黏度随剪切速率升高而下降。在相同剪切速率下,GF含量增加,非牛顿指数n增大,熔体黏度逐渐变小,且都低于纯PTT熔体黏度。粘流活化能随GF含量的增加先增加后降低。

Mechanical, interracial properties and theology behaviors of GF/PTT composites were studied by universal tester, SEM and rheometer. The results suggest that there are strong interaction between GF and PTT matrix due to the exposed GF is enwrapped with a mass of PTT resin, which lead to the strong tensile strength and impact strength of the composite. The theology results indicate that GF/PTT composites melt is pseudo-plastic fluid, and the apparent viscosity of GF/PTT composites decreases with increasing GF content. The results reveal that the value of n of the composites is increased as the content of GF increases due to the rigid GF improving the flow of the melt. Moreover, the activated energy decreases as the content of GF increases, implying that the melt with more GF has lower sensitivity to the processing temperature.