INVESTIGATION ON LOW TEMPERATURE CURING LT-02 EPOXY MATRIX COMPOSITE

摘要

The main properties of low temperature curing LT-02 epoxy resin and T300B/LT-02 prepreg cured at 75 deg C and 85 deg C were investigated in this paper. Results indicate that the curing degrees of LT-02 resin after 75 deg C /5h and 85 deg C /3h can reach 48 percent and 61 percent, respectively. The flexure strength and short beam shear strength of T300B/LT-02 composite can reach as high as 1310MPa and 80.6MPa after curing 85 deg C /3h, 1280MPa and 71.4MPa after curing 75 deg C /5h, respectively. The influence of postcuring conditions on properties of the final composite laminates was also studied. Four different heating rates 0.2 deg C /min, 0.5 deg C /min, 1.0 deg C /min and 1.5 deg C /min during heating process of freestanding postcure had no influence on the mechanical properties and heat resistance of T300B/LT-02 laminates. The final postcuring condition was fixed at 160 +- 2 deg C/2h after optimization. The main properties of T300B/LT-02 composite were characterized, and the hot/wet properties showed that the long service temperature of the prepared T300B/LT-02 composites can reach as high as 130 deg C as a structural material. A low temperature curing epoxy resin matrix composite with excellent mechanical properties, outstanding heat resistance, good toughness, great processability and low cost has been developed.