关键词: 拉挤成型, 环氧树脂, 非等温差示扫描量热法, Flynn-Wall-Ozawa, 自催化

Abstract: A type of toughened epoxy resin with good heat resistance， high strength and long application period was prepared for pultrusion by using bisphenol-A and bisphenol-F epoxy resins as raw materials and methylhexahydrophthalic anhydride as curing agent， and its curing reaction and dynamic mechanical properties were studied through non-isothermal scanning calorimetry and dynamic mechanical analysis （DMA）. The mean activation energy of the curing reaction was calculated to be 71.715 kJ/mol by using the Kissinger′s， Ozawa′s， and Flynn-Wall-Ozawa′s methods. The optimal reaction mechanism of the curing process was obtained through the fitting with several mechanism functions. The kinetic parameters， m， n， and lnA， were determined to be 0.46， 1.17， and 0.626， respectively， by using the Sestak-Berggren autocatalytic reaction model. The theoretical curves were in good agreement with the experimental data. The calculated theoretical curves were in good agreement with the experimental data. The CHILE （Tg） model established through DMA could well predict the relationship between the resin modulus and temperature under different curing degrees. This provides effective theoretical guidance and evidence for the determination of pultrusion process and quality control of composite materials.

Key words: pultrusion, epoxy resin, non-isothermal differential scanning calorimeter, Flynn-Wall-Ozawa, autocatalysis