改性EP/S–GF单向复合材料缠绕成型工艺及性能

Winding Molding Process and Properties of S–GF Reinforced Modifi ed EP Unidirectional Composite

以4,4’-二氨基二苯甲烷、苯酚和甲醛为原料合成二胺型苯并恶嗪(MDA–BOZ),并用其改性环氧树脂(EP)。采用湿法缠绕成型方法制备单向高强玻璃纤维(S–GF)增强改性EP基复合材料。用T–β外推法和凝胶化时间法确定了复合材料的成型工艺,并测试了其在室温和高温下的拉伸强度、弯曲强度、层间剪切强度等力学性能。与EP/4,4’–二氨基二苯砜(DDS)/S–GF复合材料相比,EP/MDA–BOZ/DDS/S–GF复合材料综合力学性能有较大提高。EP/MDA–BOZ/DDS/S–GF复合材料室温弯曲强度达1 428.3 MPa,层间剪切强度达79.92 MPa,纵向拉伸强度1 134.1 MPa,拉伸弹性模量为40.15 GPa。复合材料在100℃时,弯曲强度保持率为78.95%,层间剪切强度保持率为81.06%。扫描电子显微镜分析发现,改性树脂与玻璃纤维界面粘结性较好。

The diamine-based benzoxazine（MDA –BOZ） was synthesized using the raw material of 4,4＇-diamino diphenyl methane,phenol and formaldehyde, and then the epoxy resin was modified by MDA –BOZ. Unidirectional fiber composites were prepared with the method of wet winding molding. The molding process of the composites material was researched using extrapolation method and gel time method. The tensile,bending,inter-laminar shear performance both at room temperature and high temperature of the composites were tested. Compared with the EP/4, 4＇-diamino diphenyl sulfone（DDS）/S–GF composites,the EP/MDA–BOZ/DDS/S–GF composites have better comprehensive mechanical properties. At room temperature,the bending strength of EP/MDA–BOZ/DDS/S–GF composite is 1 428.3 MPa,the inter-laminar shear strength is 79.92 MPa,the tensile strength in longitudinal direction is 1 134.1 MPa,the modulus of elasticity in tension is 40.15 GPa. At the temperature of 100℃, the retention rate of bending strength is 78.95%,the retention rate of inter-laminar shear strength is 81.06%. The scanning electron microscope shows that the interface cohesiveness between the modified resin and glassfiber is very good.