期刊
COMPOSITE STRUCTURES
卷 279, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2021.114780
关键词
Self-healing Capsules; Healing Mechanism; Epoxy Composites; Microscopic techniques; 2D and 3D analysis; DCB test
资金
- EU H2020 Project SMARTFAN Smart by Design and Intelligent by Architecture for turbine blade fan and structural components systems [760779]
- COST (European Cooperation in Science and Technology) [CA19118]
The study investigated the healing efficiency of microcapsules containing DCDP on carbon fibre reinforced polymers (CFRPs) through morphological and mechanical characterisation. Micro-CT was utilized to observe crack propagation dynamics in 3D, providing qualitative and quantitative information on CFRP structure and composition. Microcapsules with Poly(urea-formaldehyde) shell and DCPD core showed promising results in reducing crack volume and achieving mechanical restoration in CFRPs.
In the present study, the healing efficiency of microcapsules containing dicyclopentadiene (DCDP) was investigated on carbon fibre reinforced polymers (CFRPs) via morphological and mechanical characterisation. Microcomputed tomography (m-CT) has been used to observe in three dimensions (3D) the dynamic process of crack propagation and give CFRPs qualitative and quantitative structural and compositional information. Microcapsules with Poly(urea-formaldehyde) as shell and DCPD as healing agent in core were prepared by in situ polymerization in an oil-in-water emulsion. The morphology and thermal properties of microcapsules were examined via Optical Microscopy, Scanning Electron Microscopy (SEM), thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). Vacuum bagging was proved an efficient technique for the CFRPs' manufacturing that microcapsules can endure. The morphology of heal progression of cracks, induced at the surface of microplastics, was observed through SEM, while for the mechanical response double cantilever beam (DCB) test was selected to evaluate heal efficiency. The reduction of the crack volume in the CFRPs internal structures was up to 45%, while the mechanical restoration exceeded 50% proving microcapsules' efficiency.
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