Degradation mechanism of carbon fiber-reinforced thermoplastics exposed to hot steam studied by chemical and structural analyses of nylon 6 matrix
| Autor: | Masao Kunioka, Masahiro Funabashi, Hideaki Hagihara, Tomio Shimada, Ryota Watanabe, Hiroaki Sato |
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| Rok vydání: | 2018 |
| Předmět: |
chemistry.chemical_classification
Thermoplastic Materials science 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Amorphous solid law.invention Stress (mechanics) Crystallinity chemistry.chemical_compound Hydrolysis Nylon 6 chemistry Mechanics of Materials law Ceramics and Composites Degradation (geology) Crystallization Composite material 0210 nano-technology |
| Zdroj: | Composites Part A: Applied Science and Manufacturing. 112:126-133 |
| ISSN: | 1359-835X |
| Popis: | Degradation testing of nylon 6-based carbon fiber-reinforced thermoplastic (CFRTP) was performed by exposure to hot steam in a closed vessel. The degraded structure was investigated to understand the degradation mechanism. Aging-induced micro-cracking in the nylon 6 matrix of CFRTP indicated that internal stress was generated by changes in its local density, along with a decrease in the molecular weight due to hydrolysis. Aging process of nylon 6 increased the free volume hole size in the amorphous part and also induced crystallization, suggesting that the density of the amorphous part decreases with increasing crystallinity in the matrix. Therefore, the degradation mechanism of the CFRTP was proposed to begin with a change in the local density of nylon 6 owing to crystallization, followed by water infiltration and hydrolysis of the matrix. Stress due to density changes combined with reduced molecular weight forms micro-cracks, decreasing the mechanical strength of CFRTP. |
| Databáze: | OpenAIRE |
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