对位芳纶/尼龙66的加工工艺对其力学性能的影响研究

由不同的加工工艺来研究对位芳纶/尼龙66(PPTA/PA66)复合材料的力学性能,结果表明:①随着PPTA纤维含量的增多,使用黏度较大的PA66基体进行复合时,PPTA/PA66复合材料的拉伸强度、弯曲强度都随之变大;对于冲击强度来说,PPTA纤维的加入,增加了其脆性,造成PPTA/PA66复合材料冲击强度不如原基体的冲击强度;②PPTA纤维含量在5%的情况下,当挤出机转速达到300r/min时材料的拉伸强度、冲击强度和弯曲强度出现极大值,此时的混合效果最理想;③较高的挤出温度有助于提高复合材料的拉伸强度和弯曲强度,对于冲击强度来说,PPTA/PA66复合材料冲击强度同样不如原基体的冲击强度;④PPTA纤维的长径比集中在65左右,芳纶纤维起到了增强效果。

Influence of processing technology on mechanical property of PPTA/PA66 composite

The mechanical properties of para-aramid/nylon 66 composites(PPTA/PA66)were studied by different processing techniques.The results shown that(1)when PA66 was used as the matrix,the tensile strength and bending strength of PPTA/PA66 increased as the increase of PPTA fiber content.However,due to the addition of PPTA Fiber,the brittleness of PPTA/PA66 was increased,resulting in the impact strength of PPTA/PA66 less than that of the original matrix.(2)When the PPTA fiber content was 5%and the extruder speed was 300 r/min,the tensile strength,impact strength and bending strength of the composites had maximum values,so the mixing effect was ideal under this condition.(3)Higher extrusion temperature can improve the tensile strength and bending strength of the composites,but not for the impact strength.The impact strength of the composites was not as good as that of the original matrix materials.(4)When the ratio of length to diameter of PPTA fiber was about 65,aramid fiber had a strengthening effect.