偶联剂处理对玻璃纤维/尼龙复合材料力学性能的影响

Effect of silicon coupling agent treatment of glass fiber on mechanical properties of GFRMCN

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KH-550处理能有效提高其力学性能;KH-550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。

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.