Improvement of ablation resistance of epoxy composites reinforced with low concentrations of multi walled carbon nanotubes
- Authors
- Ko, Se Jun; Lee, Gyu Hee; Shin, Yong Chul; Lee, Woo Il; Yum, Sang Hyuk; Kim, Hansang
- Issue Date
- Sep-2019
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Polymer-matrix composites (PMCs); High-temperature properties; Electron microscopy; Graphitization
- Citation
- COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING, v.124
- Journal Title
- COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
- Volume
- 124
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/1032
- DOI
- 10.1016/j.compositesa.2019.105471
- ISSN
- 1359-835X
- Abstract
- Ablative materials are used as a thermal protection system for objects exposed to extreme friction and ultrahigh temperature. The ablation resistance of epoxy resin reinforced with multi-walled carbon nanotubes (MWCNTs) at low concentration was investigated. The ablation resistance improved with increasing MWCNT content. The linear ablation rate of 0.5 wt% MWCNT was 30.7% less than that of neat epoxy. On the ablated surface, curved cylinder structures with superior strength to the surrounding matrix were formed around MWCNTs which acted as nucleation sites. X-ray diffraction and Raman spectroscopy revealed the formation of near-graphite structures around MWCNTs in the non-graphitizable epoxy matrix. In conclusion, MWCNTs at low concentration could facilitate the formation of near-graphitic structures in quite large region of epoxy matrix, so dramatically enhanced ablation resistance.
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