Journal
POLYMER DEGRADATION AND STABILITY
Volume 123, Issue -, Pages 162-169Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2015.11.016
Keywords
Polymer-matrix composite (PMC); Carbon fiber fabric; Thermo-oxidative aging; Thermal conductivity; Weight loss
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Funding
- Research Fund for the Doctoral Program of Xi'an Polytechnic University, China [BS1514]
- Cooperative Innovational Center for Technical Textiles,Shaanxi Province [2015ZX-02]
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The present paper examined the thermo-oxidative aging (TOA) mechanism of the thermal conductivity of carbon fiber polymer composites (CF-PMCs) and the role of reinforced structure on the thermal conductivity of CF-PMCs under TOA conditions. The three dimensional and four directional braided carbon fiber/epoxy composites (BC), the laminated plain woven fabric/epoxy composites (LC), and the neat resins (NR) were investigated for up to 1200 h at 140 degrees C in air. The process resulted in progressive deterioration of the matrix rein and fiber/matrix interfaces, in the form of chain scissions, oxidization of carbon elements, weight loss, and cracks, which significantly led to the decrease of the thermal conductivity of the NR, LC, and BC. The ratio of fiber end area to the total surface area in a sample determined the rate of weight loss and the changes in thermal conductivity. The LC samples had 1.2 times higher ratio of fiber end area to the total surface area, and their loss in thermal conductivity and weight were significantly higher than that of BC samples at the same aging conditions. Besides, the thermal conductivity of CF-PMCs was highly negatively correlated with the weight loss under TOA conditions. (C) 2015 Elsevier Ltd. All rights reserved.
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