表面粗糙度和含氧官能团对炭纤维/环氧树脂界面黏结的贡献

Contribution of surface roughness and oxygen-containing groups to the interfacial shear strength of carbon fiber/epoxy resin composites

  • 摘要: 炭纤维(CF)与基体之间的界面黏结对CF增强聚合物复合材料的性能至关重要。为了评估机械啮合和化学键合对炭纤维增强环氧树脂(EP)复合材料界面黏附性能的贡献,分离了炭纤维的表面粗糙度和含氧官能团以研究它们对界面黏附的影响。结果表明,氨水处理提高了表面粗糙度而不改变化学性能,而电化学处理在不改变表面粗糙度的情况下提高了化学性能。采用微滴法测试了CF/EP的界面剪切强度(IFSS),并通过线性拟合得到了IFSS与表面粗糙度和氧含量之间的函数关系。结果表明,在双官能和四官能环氧树脂体系中,化学键合对于增强界面黏附的贡献因子高于机械互锁。

     

    Abstract: The interfacial shear strength (IFSS) between carbon fibers (CFs) and the matrix is crucial to the performance of CF-reinforced polymer composites. To evaluate the contribution of mechanical interlocking and chemical anchoring at the interfaces of a polyacrylonitrile-based CF (TORAYCA T800SC-12000-10E)-reinforced epoxy resin (EP: bisphenol A type epoxy resin and tetrafunctional epoxy resin) composites, the surface roughness and content of oxygen-containing functional groups of the CFs were respectively altered by ammonia treatment and electrochemical oxidation. The results showed that ammonia treatment increased the surface roughness without much change to the surface elemental composition, while electrochemical oxidation increased the number of surface oxygen groups without changing the surface roughness. The IFSS of CF/EP composites was tested by the micro-droplet method. The relationships between IFSS, and surface roughness and oxygen content were obtained by linear fitting. The results showed that in the interfacial bonding of CF to epoxy resin, the contribution of chemical anchoring to the IFSS is larger than that of mechanical interlocking.

     

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