Autonomic Healing of Carbon Fiber/Epoxy Interfaces
Autonomic Healing of Carbon Fiber/Epoxy Interfaces
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DOI：
10.1021/am500536t
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发表时间：
2014-05-14
影响因子：
9.5
通讯作者：
Sottos, Nancy R.
中科院分区：
文献类型：
--
作者：
Jones, Amanda R.;Cintora, Alicia;Sottos, Nancy R.
对于用含有反应性环氧树脂和乙基苯乙酸酯 (EPA) 的胶囊进行功能化的碳纤维/环氧树脂界面，界面剪切强度 (IFSS) 最高恢复 91%。我们发现粘合剂对于提高胶囊在碳纤维表面上的保留是必要的。研究了将粘合剂施加到碳纤维表面的两种不同方法。通过嵌入环氧树脂微滴中的单个功能化纤维的 IFSS 恢复来评估愈合效率。纤维/基体界面的脱粘使胶囊破裂，将树脂和 EPA 溶剂释放到裂纹平面中。溶剂使基质膨胀，引发基质中残余胺官能团的转移，以便与输送到裂纹平面的环氧树脂进一步固化。两种粘合剂方案产生的结果相当，均比不使用粘合剂制备的样品产生更高的 IFSS 回收率。
A maximum of 91% recovery of interfacial shear strength (IFSS) is achieved for carbon fiber/epoxy interfaces functionalized with capsules containing reactive epoxy resin and ethyl phenyl acetate (EPA). We find a binder is necessary to improve the retention of capsules on the carbon fiber surface. Two different methods for applying the binder to the carbon fiber surface are investigated. Healing efficiency is assessed by recovery of IFSS of a single fimctionalized fiber embedded in a microdroplet of epoxy. Debonding of the fiber/matrix interface ruptures the capsules, releasing resin and EPA solvent into the crack plane. The solvent swells the matrix, initiating transport of residual amine functionality from the matrix for further curing with the epoxy resin delivered to the crack plane. The two binder protocols produce comparable results, both yielding higher recovery of IFSS than samples prepared without a binder.