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Open AccessArticle

Quick Preparation of Moisture-Saturated Carbon Fiber-Reinforced Plastics and Their Accelerated Ageing Tests Using Heat and Moisture

1
Research Institute for Sustainable Chemistry, National Institute of Advanced Industrial Science and Technology (AIST), Higashi 1-1-1, Tsukuba, Ibaraki 305-8565, Japan
2
Composite Laboratory, Manufacturing Technology Research Department, Mitsubishi Heavy Industries, Ltd., Takamichi 1, Iwatuka-chou, Nakamura-ku, Nagoya, Aichi 453-8515, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Naozumi Teramoto
Polymers 2016, 8(6), 242; https://doi.org/10.3390/polym8060242
Received: 27 April 2016 / Revised: 8 June 2016 / Accepted: 15 June 2016 / Published: 22 June 2016
A quick method involving the control of heat and water vapor pressure for preparing moisture-saturated carbon fiber-reinforced plastics (CFRP, 8 unidirectional prepreg layers, 1.5 mm thickness, epoxy resin) has been developed. The moisture-saturated CFRP sample was obtained at 120 °C and 0.2 MPa water vapor in 72 h by this method using a sterilizer (autoclave). The bending strength and viscoelastic properties measured by a dynamic mechanical analysis (DMA) remained unchanged during repetitive saturation and drying steps. No degradation and molecular structural change occurred. Furthermore an accelerated ageing test with two ageing factors, i.e., heat and moisture was developed and performed at 140–160 °C and 0.36–0.62 MPa water vapor pressure by using a sealed pressure-proof stainless steel vessel (autoclave). The bending strength of the sample decreased from 1107 to 319 MPa at 160 °C and 0.63 MPa water vapor pressure in 9 days. Degraded samples were analyzed by DMA. The degree of degradation for samples was analyzed by DMA. CFRP and degraded CFRP samples were analyzed by using a surface and interfacial cutting analysis system (SAICAS) and an electron probe micro-analyzer (EPMA) equipped in a scanning electron microscope. View Full-Text
Keywords: carbon fiber reinforced plastics (CFRP); accelerated ageing test; dynamic mechanical analysis (DMA); electron probe micro-analysis (EPMA); surface and interfacial cutting analysis system (SAICAS) carbon fiber reinforced plastics (CFRP); accelerated ageing test; dynamic mechanical analysis (DMA); electron probe micro-analysis (EPMA); surface and interfacial cutting analysis system (SAICAS)
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MDPI and ACS Style

Kunioka, M.; Shimada, T.; Hagihara, H.; Funabashi, M.; Suda, H.; Horizono, H. Quick Preparation of Moisture-Saturated Carbon Fiber-Reinforced Plastics and Their Accelerated Ageing Tests Using Heat and Moisture. Polymers 2016, 8, 242.

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