偶联剂处理对玻璃纤维/尼龙复合材料力学性能的影响

采用KH-550 和KH-570 两种不同的偶联剂处理玻璃纤维, 得到的玻璃纤维增强铸型(MC) 尼龙复合材料( GFRMCN) 的力学性能差别很大。经过KH-570 处理GFRMCN 力学性能降低, 而经过KH₂550 处理能有效提高其力学性能; KH₂550 质量分数与处理的玻璃纤维质量分数之间符合定量关系式, 含量为0. 2 %时, GFRMCN的弯曲强度提高了35 % , 弯曲模量提高了72 % , 拉伸强度提高了46 % , 弹性模量提高了88 % , 冲击强度提高了41 %。KH-550 偶联剂在玻璃纤维与尼龙基体之间形成良好界面结合, 达到增强效果; 而未经处理的玻璃纤维断裂时从基体中拔出, 玻纤与尼龙界面相当于缺陷, 使MC 尼龙性能下降。 

Effect of sil icon coupl ing agent treatment of glass f iber on mechanical properties of GFRMCN

Different silicon coupling agents(SCA) cause a large difference in mechanical properties of the glass(fiber) reinforced MC nylon(GFRMCN).The KH-570 SCA makes them decrease while the KH-550 makes them(improve.) There is a rational formula between the mass fractions of KH-550 and glass fiber.When the mass fraction of KH-550 is 0.2%,the bend strength,bend modulus,tensile strength,tensile stress and impact strength of GFRMCN are increased by 35%,72%,46%,88% and 41%,compared with those of MC nylon.Glass fibers after surface treatment with KH-550 SCA increase the properties of GFRMCN because of a good interface between GF and nylon.However,most glass fibers are drawn out from nylon basement if they are not treated with SCA.The interfaces of GF/nylon become fatal weakness and reduce the properties of GFRMCN.