Synthesis and properties of the vapour-grown carbon nanofiber/epoxy shape memory and conductive foams prepared via latex technology

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• 作者：Yubing Dong ; Juan Ding ; Jing Wang ; Xiang Fu ; Huimin Hu ; Shan Li ; Hongbing Yang ; Congsheng Xu ; Mingliang Du ; Yaqin Fu ; ^{fuyaqin@yahoo.com.cn}
• 关键词：A. Carbon fibre ; A. Nanocomposites ; A. Smart materials ; B. Curing ; B. Electrical properties
• 刊名：Composites Science and Technology
• 出版年：2013
• 出版时间：4 March, 2013
• 年：2013
• 卷：76
• 期：Complete
• 页码：8-13
• 全文大小：1177 K

文摘

Vapour-grown carbon nanofiber (VGCNF)/epoxy foams were prepared via latex technology. VGCNFs were first dispersed in water-borne epoxy resin by intensive stirring and then mixed with curing agent and blowing agent at room temperature. VGCNF/epoxy foams were obtained from these mixtures via freeze-drying and foaming under a vacuum at 100 ¡ãC. The shape memory properties of the epoxy foams were evaluated together with other physical properties. Compression and thermo-mechanical cycle tests were performed to measure the effects of the VGCNFs on the mechanical performance of the foams. Electrical conductivity was measured using a standard four-point method. The experimental results indicated that the VGCNF/epoxy foams had a low glass transition temperature of 48 ¡ãC, resulting in a fast recovery rate at 65 ¡ãC in 10 s. The epoxy foam had a high shape recovery and fixity ratio of more than 90 % after several thermo-mechanical cycles with the addition of 1.0 wt % VGCNFs. The VGCNFs enhanced the strength and electrical conductivity of the epoxy foams. The percolation threshold for conduction was approximately 0.6 wt % of VGCNFs in the composites. Moreover, the electrical conductivity of the improved epoxy foam did not significantly decrease with increasing thermo-mechanical cycles below 80 % compression strain.