不同形态玻璃纤维对尼龙66结构与性能影响

Structure and Properties of polyamide 66 Effected by Different Glass Fibers

采用双螺杆挤出机将尼龙66(PA66)和短切玻璃纤维(GF)熔融共混,通过侧喂料口方式加入圆柱状和两种不同扁平度的GF,制备生产出GF增强PA66复合材料PA66/GF。采用电子万能试验机、差示扫描量热仪、扫描电子显微镜等研究了不同GF形态复合材料的力学性能、结晶能力、断面形貌和热稳定性等指标,并分析了GF在PA66基体中的分散性,探讨了PA66/GF复合材料力学性能与微观结构之间的关系。结果表明,圆柱状GF复合材料的整体力学性能优于扁平GF复合材料,随着GF含量增加,复合材料性能提高显著,但扁平GF复合材料的冲击强度较圆柱状GF复合材料更为优异,随着扁平度的增加,冲击性能有所提高;不同形态GF的复合材料具有显著的各向异性,但对其熔融结晶行为及热稳定性的影响程度较小。

A twin-screw extruder was used to melt and blend polyamide 66(PA66)and chopped glass fiber(GF).The GF reinforced PA66 composite PA66/GF was prepared by adding different forms of GF through side feeding orifice.The properties of three kinds of composites were studied by means of electronic universal testing machine,DSC,SEM and other modern testing equipment,and the mechanical properties,crystallization ability,section morphology and thermogravimetric properties of the composites were tested according to the standards.The dispersion of GF in the matrix and the interface between GF and resin were analyzed,and the relationship between mechanical properties and microstructure of reinforced composites was discussed.Test results show that the overall mechanical performance of cylindrical GF composite is better than that of flat GF composite,with the increase of GF content,performance improved significantly,but the impact strength of flat GF composite material is more outstanding,improving along with the increase of the degree of flat.Different forms of GF composites have obvious anisotropy,however,it has little effect on melting crystallization behavior and thermal stability.