RTM成型碳纳米管/玻纤混杂多尺度复合材料的电性能

Manufacturing and electrical properties of CNTs/glass fabric hybrid multi-scale composites via RTM

采用树脂传递模塑(Resin Transfer Molding,RTM)工艺制备碳纳米管(Carbon Nanotubes,CNTs)/玻璃纤维/环氧混杂多尺度复合材料,研究其结构与电性能的相关性。采用优化的分散工艺将CNTs分散于环氧树脂中制成纳米复合树脂基体,经RTM工艺制备玻璃纤维/碳纳米管混杂多尺度复合材料,考察CNTs形态结构变化和复合材料的导电行为。研究表明,RTM复合材料的电渗流阈值为0.3 wt%,而使用非离子表面活性剂Triton X-100作为分散助剂的复合材料电渗流阈值为0.1 wt%。当CNTs含量为0.3 wt%时,RTM模具入口处复合材料电阻率比中间和出口处低2个数量级。TEM分析表明,CNTs动态渗流网络形成以及CNTs在复合材料内部的分布是导致RTM复合材料电性能呈现梯度变化的原因。

Carbon Nanotubes （CNTs）/glass fabric hybrid multi-scale composites was fabricated via Resin Transfer Molding （RTM）technique to explore the relationship of its structure and electrical properties. CNTs was dispersed in epoxy resin to gain a nano-composite matrix used for RTM process. The resulting hybrid multi-scale composites were studied with respect to the structural changes and electrical properties. The re- search shows that the hybrid composites with and without surfactant, Triton X-100, bear the percolation thresholds of 0.1 wt% and 0.3 wt%, respectively. At CNTs content of 0.3 wt%, the specimens taken from the inlet gate region of the RTM equipment show a decrease of electrical volume resistivity by two magnitudes compared with those of the samples taken from the middle and outlet gate region. The analysis of Transmission Electron Microscopy （TEM） indicates that the variation in the network structure of the CNTs within the nano-composite matrix during the injection molding process is responsible for the gradient in resistivity of the RTMed laminates.