PEN短纤维增强PTT复合材料的流变性能及力学性能

研究了聚对苯二甲酸丙二酯(PTT)/聚对萘二甲酸乙二酯(PEN)短纤维复合材料的流变行为和力学性能,讨论了复合材料的组成、剪切应力和剪切速率及温度对熔体流变行为、熔体黏度的影响,以及不同配比复合材料的力学性能。结果表明,PTT/PEN短纤维复合材料熔体为假塑性流体,熔体表观黏度随着温度升高而下降,且熔体黏度随着PEN短纤维含量增加而不断上升。随PEN短纤维加入量的增加,复合材料的拉伸强度、断裂强度、弹性模量均明显提高,无缺口冲击强度略有提高,说明PEN短纤维的加入对PTT起到了明显的增强作用而不降低材料的韧性。

A Study on Rheology and Mechanical Characteristics of Short PEN Fiber Reinforced PTT Composites

Fiber reinforced composites were prepared by twin-screw extruder with short PEN fiber and PTT resin,and their rheology and mechanical properties were investigated respectively.Influences of composition of the blends,shearing stress,shearing rate and temperature on the rheological behavior and viscosity of the melt were discussed.Results shows that all of the composites are pseudo-plastic fluid.The melt viscosity of the composites increases gradually as PEN short fiber content is increased.Furthermore,increasing temperature decreases the viscosity of the composites′ melt.The investigation of the mechanical properties suggested that the tensile strength,rupture strength and flexibility modulus are all increased much with increasing PEN fiber,while impact strength keeps nearly constant,which indicating an obvious improving of the strength of PTT with addition of the PEN short fiber but without reducing the tenacity of the composites.