非均相固化体系对复合材料树脂微观力学均匀性的影响

Effect of Heterogeneous Resin Curing Agent on Micro-mechanical Uniformity of Resin Matrix of Composites

采用热熔法制备预浸料涉及熔融树脂对纤维层的渗透,对于固化体系为非均相的环氧树脂基体,制备大厚度预浸料可能会受到固化剂分布不均的影响。利用纳米力学方法分别研究采用小厚度玻璃纤维预浸料制备的复合材料和通过树脂真空吸注工艺制备的玻璃纤维复合材料的内部树脂的微观力学均匀性。结果表明:由小厚度预浸料制备的复合材料,其内部树脂各区域具有较好的微观力学均匀性,各区域树脂的纳米硬度和耐磨损性基本相同,各铺层中心和边缘接近;通过树脂真空吸注工艺制备的复合材料则表现出明显的层状分布,固化剂和促进剂颗粒在纤维层外部富集,纤维层外层的树脂具有较高的纳米硬度和耐磨损性,而在纤维层内0.4mm深后的树脂纳米硬度下降,耐磨损性下降,纤维层内部的树脂纳米硬度很低。

Preparation of prepregs by hot melt method is generally involved the infiltration of resin.For the epoxy resin with a heterogeneous curing system,the preparation of large thickness prepregs may be affected by the uneven distribution of curing agent.A nanomechanical method was used to study the micro-mechanical uniformity of the resin matrix of the composites prepared by thin thickness glass fibre prepregs and the glass fibre reinforced composites prepared by resin vacuum suction technology.The results show that to the composites prepared by thin thickness prepregs,the resin exhibits good micro-mechanical uniformity,the nano-hardness and wear properties of the resin at the different regions of the composite cross-section have a good uniformity.The composites prepared by resin vacuum suction method exhibits obvious layered distribution,the particles of the curing agent and accelerator are enriched at the outer surface of the fiber layer.The resin at the outer layer of the fibre layer has higher nano hardness and wear resistance,while to the resin about 0.4mm inside the fiber layer,its hardness goes down,a very low nano hardness of the resin deeply inside the fiber layer is observed.