Abstract
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.
Highlights
Many kinds of carbon fiber-reinforced plastics (CFRP) are used for fabrication of airplanes and in construction due to their low weight and high strength
The moisture content of samples was determined by calculating the difference between the wet moisture content of CFRP samples was determined by calculating the difference between wet mass, measured measuredafter afterdrying dryingunder underaareduced reducedpressure pressure(around
The moisture absorption by CFRP did not change during the three cycles of saturation and drying
Summary
Many kinds of carbon fiber-reinforced plastics (CFRP) are used for fabrication of airplanes and in construction due to their low weight and high strength. CFRP parts are produced by heating for hardening a thermoset resin such as epoxide with. Shortening the cycle time, thermoplastics as polyamide instead of epoxide areinjection used, resulting in in carbon fiber reinforced thermoplastics such (CFRTP). The resin in the does absorb atmospheric moisture. The amount absorbed by epoxy resins is generally around 5% moisture of their mass. The properties of of CFRP absorbed change depending on theismoisture example,of the bending of CFRP change depending on the moisture content. The bending strength of used used in this study was decreased to 90% at moisture-saturated conditions. In2016, this 8, study, Polymers the quick method for preparing moisture-saturated CFRP
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