PA66短纤维用于提高聚甲基乙撑碳酸酯力学与热学性能的研究∗

摘要

Poly(propylene carbonate)(PPC)ylon 66(PA66)short fiber composite were prepared by a co-rota-ting twin-screw extruder.The structure and properties were investigated.The mechanical and thermal proper-ties of PPC/PA6 6 composites were evaluated by tensile and impact test,differential scanning calorimetry (DSC) and thermogravimetry analysis (TGA),respectively.Results of FT-IR reveal that the hydrogen bond has formed between the carbonyl group of PA6 6 and hydrogen group of PPC.The properties of composites are af-fected significantly by the content of PA6 6 short fiber.The tensile and impact strength,thermal stability of composites is increased when the content of PA66 short fiber is lower than 20wt%.The increase of impact strength,decomposition temperature of 5% mass loss (T-5%)and glass transition temperature of PPC with 20 wt% PA66 short fiber loading is 315.81%,32.2 and 3.8 ℃,respectively.When the content of PA66 short fiber is 30wt%,a significant aggregation of PA66 short fiber is observed by SEM,which causes the decrease of me-chanical and thermal properties for composite.This illuminates that the improvement of the mechanical proper-ties and thermal stability for PPC with the addition of PA6 6 short fiber is owing to the formation of hydrogen and the characterization of PA6 6 short fiber (such as drawing deformation by stress).%聚甲基乙撑碳酸酯(PPC)分子间作用力较低、力学和热学性能较差,通过双螺杆挤出制备 PPC/PA66短纤维复合材料,促进 PA66短纤维与 PPC 形成氢键作用力,有利于提高PPC材料的综合性能.红外光谱分析结果表明 PA66短纤维的羰基与 PPC 分子链中的羟基之间形成了氢键,PA66短纤维的引入提高了PPC的力学性能和热学性能.当短纤维含量为20％(质量分数)时,复合材料的缺口冲击强度提高了315．8％,初始分解温度和玻璃化温度分别提高了32．2和3．8℃.当短纤维含量继续增加至30％(质量分数)时,由于高含量的纤维之间容易发生团聚,导致复合材料的力学性能略有下降.PPC力学和热学性能的显著提高,主要原因是氢键作用力的形成和 PA66短纤维受力后发生的拉丝形变所引起.