Fracture and fatigue response of a self-healing epoxy adhesive
Fracture and fatigue response of a self-healing epoxy adhesive
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DOI：
10.1016/j.polymer.2011.02.011
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发表时间：
2011-03-23
期刊：
影响因子：
4.6
通讯作者：
White, Scott R.
中科院分区：
文献类型：
--
作者：
Jin, Henghua;Miller, Gina M.;White, Scott R.
用双环戊二烯(DCPD)单体和双(三环已基膦)亚苄基二氯化Ru(GRubbs‘s第一代)催化剂颗粒分散在薄薄的环氧树脂基质中，制备了一种用于粘接钢铁基材的自愈环氧胶。采用宽锥形双悬臂梁试件几何形状，对试件的准静态断裂性能和疲劳性能进行了评价。在室温条件下愈合24小时后，准静态断裂条件下的断裂韧性恢复到原始断裂韧性的56%。对于使树脂和对照样品不合格的疲劳试验条件，证明了完全止裂。用电子显微镜检查骨折表面，发现愈合后有聚合的DCPD的证据。这些结果首次对粘合剂应用中典型的薄膜(约360微米)的自愈性进行了机械评估。(C)2011爱思唯尔有限公司。保留所有权利。
A self-healing epoxy adhesive for bonding steel substrates is demonstrated using encapsulated dicyclopentadiene (DCPD) monomer and bis(tricyclohexylphosphine)benzylidine ruthenium (IV) dichloride (Grubbs' first generation) catalyst particles dispersed in a thin epoxy matrix. Both quasi-static fracture and fatigue performance are evaluated using the width-tapered-double-cantilever-beam specimen geometry. Recovery of 56% of the original fracture toughness under quasi-static fracture conditions occurs after 24 h healing at room temperature conditions. Complete crack arrest is demonstrated for fatigue test conditions that render neat resin and control samples failed. Inspection of fracture surfaces by electron microscopy reveals evidence of polymerized DCPD after healing. These results are the first mechanical assessment of self-healing for thin (ca. 360 mu m) films typical of adhesives applications. (C) 2011 Elsevier Ltd. All rights reserved.