长玻纤增强尼龙66复合材料性能的研究

在自制装置中用硅烷偶联剂KH550对长玻纤(LGF)进行表面处理后,采用熔融共混法制备了尼龙66/长玻纤复合材料。采用微机全自动热膨胀系数测定仪记录了玻纤增强尼龙66复合材料的热膨胀曲线,分析了玻纤含量、温度对复合材料热膨胀系数的影响,结果表明,随着玻纤含量的增加,复合材料的热膨胀系数显著下降,最大降低了74.2%;随着温度的升高,复合材料的热膨胀系数先增大后减小最后趋于平衡,转折温度在37℃左右。测试了复合材料的力学性能,结果显示复合材料的拉伸强度、弯曲强度和缺口冲击强度随玻纤含量的增加而大幅度提高,最大分别增加了173%、186%和283%。通过扫描电镜观察到玻纤嵌入尼龙66基体中,与尼龙66形成了良好的界面黏结。

Study on Properties of Long Glass Fiber Reinforced PA66 Composites

After the long glass fiber(LGF)was surface treated in the silane coupling agent KH550 by self-made device,the polyamide66/long glass fiber composites were prepared by melting blending method.The thermal expansion curves of glass fiber reinforced polyamide 66 composites were recorded by microcomputer automatic thermal expansion coefficient locator,and then the influence of contents of glass fiber and temperature on the coefficients of thermal expansion(CTE)of composites was analyzed.The results revealed that as the contents of glass fiber increased,the CTE of composites decreased,even the biggest was reduced by 74.2%;with increasing temperature,the CTE of composites increased firstly,then decreased to equilibrium and discontinuity temperature was near 37 ℃.Then measured the mechanical properties of composite.The results showed that the tensile strength,bending strength and notched impact strength of composites were greatly raised largely even up to 173%,186%and 283%,respectively,as the contents of glass fiber increased.The glass fiber embedded in PA66 and formed a good interface bonding with PA66 through SEM.