芳纶复合材料的界面粘结

为改善芳纶纤维增强树脂基复合材料中界面粘结强度,本研究用Mctowo.Takayanagi——化学处理法,对芳纶1414纤维进行表面处理.并依据红外光谱分析(IR),元素分析(E.A.),XPS能谱分析等近似估价芳纶1414纤维表面导入约88mol%接技率的E-51环氧化合物.用单纤维拉拔实验法直接测定芳纶1414纤维/环氧树脂基体体系的界面剪切强度.实验结果表明,芳纶1414纤维经表面环氧接技化处理后,可较明显地提高界面剪切强度而对纤维拉伸强度的降低较小.树脂基体性能对界面剪切强度的影响较显著.通过电子显微镜(SEM)观察被拔出纤维及树脂孔穴的破坏形貌,解析界面破坏机理.

THE INTERFACIAL ADHESION OF ARAMID COMPOSITE

In making an improvement on the interfacial adhesion between aramid fiber and matrix,the Motowo.Takayanagi Chemical Method was used to treat the skin layer of aramid fiber with polyfunetional epoxide. The surface structures of treated fiber were studied by IR, elemental analysis and XPS. The average graft degree of epoxide on the surface of fiber was obtained for about 88mol%, which was gained from calibration curves.In this paper, the strength of interfacial adhesion was measured by Pullout Test of monofilament. The used fiber was Aramid 1414 and the ma-trix was epoxide. Experimental results showed that the interfacial ad-hesion strength increases noticeably for graft treated fiber but its tensile strength decreases slightly. On the other hand, the effect of matrix on the interfacial adhesion strength is important.The fracture surface morphologies of pulled out fiber and matrix cavity were observed by SEM and some analysis of the damage mechanism was de-scribed.