Park JM, Kim YM, Kim KW, Yoon DJ
Department of Polymer Science and Engineering, Research Center for Aircraft Parts Technology
J Colloid Interface Sci. 2000 Nov 1;231(1):114-128. doi: 10.1006/jcis.2000.7113.
Using a monomeric and two polymeric coupling agents, interfacial aspects of electrodeposited (ED) carbon fiber/epoxy composites were investigated by means of fragmentation techniques and acoustic emission (AE). ED results for dipped and untreated fibers under dry and wet conditions were compared. Multifiber-embedded composites (MFC) were prepared for direct comparison. Various treating conditions such as treating time, concentration of coupling agent, and treating temperature were optimized, respectively. The adsorption mechanisms of the coupling agents onto the carbon fiber were analyzed in terms of the electrolyte molecular interactions during ED process, due to chain mobility in the aqueous solution. The microfailure mechanisms occurring from fiber breaks, and matrix and interlayer cracks were examined by AE parameters. The interfacial shear strength (IFSS) of ED-treated carbon fibers was much higher than that of the other two cases under dry and wet conditions. Well-separated AE groups were found for the untreated, the dipped, and the ED-treated cases, and significantly more AE events occurred from the ED interlayer failure between fiber and matrix than from the untreated and even than from the dipping cases. AE events from different-type interlayers may be correlated with IFSS based on the differing mechanical and chemical roles of the interlayers. Copyright 2000 Academic Press.
使用一种单体偶联剂和两种聚合物偶联剂，通过断裂技术和声发射（AE）研究了电沉积（ED）碳纤维/环氧树脂复合材料的界面情况。比较了在干燥和潮湿条件下浸渍和未处理纤维的电沉积结果。制备了多纤维嵌入式复合材料（MFC）用于直接比较。分别优化了诸如处理时间、偶联剂浓度和处理温度等各种处理条件。根据电沉积过程中电解质分子间的相互作用，分析了偶联剂在碳纤维上的吸附机制，这是由于水溶液中的链迁移率所致。通过AE参数研究了由纤维断裂、基体和层间裂纹引发的微观失效机制。在干燥和潮湿条件下，经电沉积处理的碳纤维的界面剪切强度（IFSS）远高于其他两种情况。对于未处理、浸渍和电沉积处理的情况，发现了明显分开的AE组，并且纤维与基体之间的电沉积层间失效产生的AE事件明显多于未处理的情况，甚至多于浸渍情况。基于层间不同的机械和化学作用，不同类型层间的AE事件可能与IFSS相关。版权所有2000年学术出版社。
