One phthalonitrile resin system previously developed in our lab had a melting temperature around 160 °C, which was reported at SAMPE 2011. After modification, the resin started to melt around 100 °C and could maintain low viscosity at 130-140 °C for over 4 hours after mixed with catalyst, which was suitable for RTM. The processability of the resin system was studied by Rheometer. DSC and TGA were used to research the cure reaction and thermal properties, respectively. The relationship between glass transition temperature and curing temperature was studied by DMA technique. Preliminary study of mechanical properties of carbon fabric reinforced composite fabricated by RTM was carried out at room and elevated temperature. After the composite panel was cured to 375 °C, the retention rate of flexure strength was near 60 % at 400 °C and over 40% at 500 °C. The retention rate of short beam shear strength was over 60 % at 400 °C and above 40 % at 500 °C. All above demonstrated that this resin may be a good matrix for RTM and an excellent candidate for high performance polymeric materials.
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