The interfacial strength and fracture characteristics of ethanol and polymer modified carbon nanotube fibers in their epoxy composites
The interfacial strength and fracture characteristics of ethanol and polymer modified carbon nanotube fibers in their epoxy composites
复制标题
乙醇与聚合物改性碳纳米管纤维在环氧复合材料中的界面强度和断裂特性
DOI：
10.1016/j.carbon.2012.10.011
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发表时间：
2013-02-01
期刊：
影响因子：
10.9
通讯作者：
Zhang, Zuoguang
中科院分区：
文献类型：
--
作者：
Liu, Ya-Nan;Li, Min;Zhang, Zuoguang
将碳纳米管(CNT)纤维阵列纺丝成纤维增强环氧复合材料，通过单纤维断裂试验研究了其界面剪切强度(IFSS)和断裂行为。碳纳米管纤维与基质之间的界面剪切强度强烈依赖于纤维中引入的液体类型。在不同纺丝条件下，乙醇浸渍碳纳米管纤维/环氧复合材料的界面剪切强度在8.32~26.64 Mpa之间变化。当引入长分子链或交联型聚合物时，除了提高纤维强度外，聚合物改性纤维与环氧基的粘附性也得到显著改善。最重要的是，聚酰亚胺改性碳纳米管纤维的抗弯强度可达120.32 Mpa，比乙醇渗透碳纳米管纤维复合材料高一个数量级，也高于典型的碳纤维/环氧复合材料(如60-90 Mpa)。复合材料的IFSS与碳纳米管纤维的拉伸强度和弹性模量成正比，并随纤维直径的增大而减小。结果表明，通过控制纤维的结构和引入聚合物来优化纤维内部的管-管相互作用，可以显著地调节碳纳米管纤维/环氧树脂的界面强度。(C)2012爱思唯尔有限公司。保留所有权利。
Carbon nanotube (CNT) fibers spun from CNT arrays were used as the reinforcement for epoxy composites, and the interfacial shear strength (IFSS) and fracture behavior were investigated by a single fiber fragmentation test. The IFSS between the CNT fiber and matrix strongly depended on the types of liquid introduced within the fiber. The IFSS of ethanol infiltrated CNT fiber/epoxy varied from 8.32 to 26.64 MPa among different spinning conditions. When long-molecule chain or cross-linked polymers were introduced, besides the increased fiber strength, the adhesion between the polymer modified fiber and the epoxy matrix was also significantly improved. Above all, the IFSS can be up to 120.32 MPa for a polyimide modified CNT fiber, one order of magnitude higher than that of ethanol infiltrated CNT fiber composites, and higher than those of typical carbon fiber/epoxy composites (e.g. 60-90 MPa). Moreover, the composite IFSS is proportional to the tensile strength and modulus of the CNT fiber, and decreases with increasing fiber diameter. The results demonstrate that the interfacial strength of the CNT fiber/epoxy can be significantly tuned by controlling the fiber structure and introducing polymer to optimize the tube-tube interactions within the fiber. (C) 2012 Elsevier Ltd. All rights reserved.