Journal
COMPOSITES SCIENCE AND TECHNOLOGY
Volume 200, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2020.108336
Keywords
Carbon fibers; Polymer-matrix composites; Interface/interphase; Rigid-flexible structure; Multistage gradient modulus
Categories
Funding
- Natural Science Foundation of China [51803102, 51903129]
- Natural Science Foundation of Shandong Province [201807070028, 201808220020]
- Source Innovation Project of Qingdao [19-6-2-75-cg]
- Industry and Education Cooperation Program of The Ministry of Education [201802201002, 201901078008, 201802230009]
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The gradient modulus intermediate layer between CF and epoxy by designing double rigid-flexible structure using CNTs and polyamide (PA) on the CF surface was firstly established, and the effects of modulus intermediate layer on interfacial and mechanical properties of CF composites were investigated. The constructing of double rigid-flexible structure on the CF surface can greatly increase the polar functional groups, roughness and wettability of the CF surface as well as the thickness of intermediate layer, which could balance the modulus of fiber and resin to achieve the best matching. The interfacial shear strength (IFSS), interlaminar shear strength (ILSS), flexural strength, and impact strength of CF composites increased by 75.6%, 44.1%, 41.3%, and 34.6%, respectively. In addition, the interfacial failure behaviors and strengthening mechanisms of composites have been studied. This novel design and method built a multistage gradient modulus intermediate layer of composite with strong physicochemical interaction and good wettability, which has greatly potential for high-performance composite.
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