碳纳米管-玻璃纤维/环氧层板双真空灌注工艺及性能

针对碳纳米管(CNT)-玻璃纤维/环氧树脂体系, 采用传统的真空灌注工艺(VARIM)和双真空灌注工艺(DVARIM)制备复合材料层板, 分析了不同工艺方法下层板缺陷状况, 测试了层板的弯曲性能和层间剪切性能, 并结合树脂性能和纤维/树脂界面粘结状况观察, 探讨了DVARIM对CNT分布的影响及碳管的增强机制。结果表明: 与传统的VARIM相比, DVARIM能增加纤维的间距, 提高树脂对纤维的浸润能力, 减小纤维束内的孔隙缺陷; 添加质量分数为0.05％的酸化CNT后层板性能提高, 而且采用DVARIM性能提高更明显; 不同灌注工艺对CNT的分布产生影响, 从而改变了CNT对纤维/树脂界面粘接的影响, 同时这种影响与织物结构的紧密程度有关。 

Double vacuum assisted resin infusion molding and property of carbon nanotube-glass fiber/epoxy resin laminates

The carbon nanotube (CNT)-glass fiber/epoxy resin laminates were prepared by traditional vacuum assisted resin infusion molding (VARIM) and double vacuum assisted resin infusion molding (DVARIM), respectively. The defects of the laminates processed with the two methods were examined, and the mechanical properties including flexural property and interlaminar shear strength (ILSS) were measured. The distribution and the enhancement mechanism of CNT in the laminates with DVARIM were studied by the measurement of the resin properties and the observation of the fiber/resin interfacial bonding. It shows that, compared with traditional VARIM, the defects in the fiber bundles decrease because the spaces within fibers increase and the resin infiltration improves in DVARIM. The mechanical properties of the laminates are enhanced by adding 0.05% mass fraction of acidulated CNT, especially for the laminates processed by DVARIM. In addition, the infusion process influences the distribution of CNT in the laminates, and further changes the effects of CNT on the interface bonding of fiber/resin, which is dependent on the compactness of the fabric.