芳纶纤维增强树脂基复合材料的界面粘结性能研究

Interfacial Bond Property of Aramid Fibers Reinforced Polymer Matrix Composites

为了改善芳纶纤维增强树脂基复合材料的界面粘结性能,从树脂基体入手,依据相似相容原理和芳纶的结构特点,合成出新型热固性树脂(AFR–T)用作芳纶复合材料的基体,以未经表面处理的芳纶作增强材料,采用热压成型法制备了AFR–T/芳纶纤维复合材料,并通过测定溶度参数、接触角、线膨胀系数、层间剪切强度(ILSS)和横向拉伸强度等方法研究了复合材料的界面粘结性能。结果表明,AFR–T树脂浇注体与芳纶的溶度参数相近,AFR–T树脂溶液在芳纶纸表面的接触角为36.9°,小于环氧树脂(EP)溶液与芳纶纸的接触角(53.2°),说明AFR–T树脂对芳纶的浸润性优于EP;AFR–T/芳纶纤维复合材料的ILSS和横向拉伸强度为73.0 MPa和25.3 MPa,分别比EP/芳纶纤维复合材料提高了25.9%和32.5%,这表明AFR–T树脂与芳纶纤维之间的浸润性和界面粘结性能较好。

In order to improve the interracial adhesion of aramid fiber reinforced polymer matrix composites, a new thermosetting resin （ AFR-T ） had been developed according to law of similar mutual solubility and the structural characteristics of aramid fibers. With aramid fibers without surface treatment being used for reinforcing materials, AFR-T/aramid composites were prepared by hot-press molding. The interracial adhesion properties of AFR-T/aramid composites were investigated by the methods of the solubility parameter, contact angle, coefficients of thermal expansion, interlaminar shear strength （ ILSS ） and transverse tensile strength etc.. The results showed that the solubility parameter of AFR-T casting was similar to that of aramid fiber. The contact angle （ 36.9° ） between AFR-T resin and aramid fiber was smaller than the contact angle （ 53.2° ） between epoxy resin （ EP ） and aramid fiber, it indicated that the wettability of AFR-T resin to aramid fiber was better than that ofEP. ILSS and transverse tensile strength of AFR-T / aramid composite were respectively 73.8 MPa and 25.3 MPa, increasing by 25.9% and 32.5% respectively compared with EP / aramid composite. Therefore, AFR-T resin had good interface bonding performance with aramid fiber.