Abstract
TG–FTIR combined technology was used to study the degradation process and gas phase products of epoxy glass fiber reinforced plastic (glass fiber reinforced plastic) under the atmospheres of high purity nitrogen. The pyrolysis characteristics of epoxy glass fiber reinforced plastic were measured under different heating rates (5, 10, 15, 20 °C min−1) from 25 to 1000 °C. The thermogravimetric analyzer (TG) and differential thermogravimetric analyzer (DTG) curves show that the initial temperature, terminal temperature, and temperature of maximum weight loss rate in the pyrolysis reaction phase all move towards high temperature, as the heating rate increases. Epoxy glass fiber reinforced plastic has two stages of thermal weightlessness. The temperature range of the first stage of weight loss is 290–460 °C. The second stage is 460–1000 °C. The above two weight loss stages are caused by pyrolysis of the epoxy resin matrix, and the glass fiber will not decompose. The dynamic parameters of glass fiber reinforced plastic were obtained through the Kissinger-Akahira-Sunose (KAS), Flynn–Wall-Ozawa (FWO) and advanced Vyazovkin methods in model-free and the Coats–Redfern (CR) method in model fitting. FTIR spectrum result shows that the main components of the product gas are CO2, H2O, carbonyl components, and aromatic components during its pyrolysis.
Highlights
Glass fiber reinforced plastic generally refers to a composite material with a glass fiber reinforced polymer resin matrix, which is widely used in aviation, aerospace, weapons, chemical, construction, and marine fields considering its good performance in mechanical properties, thermal insulation properties, and corrosion resistance [1,2,3,4,5,6,7,8]
The reasons for this can be explained by the first stage of pyrolysis, where the epoxy resin matrix main chain of the epoxy glass fiber reinforced plastic sample is broken and the small molecule curing agent acid anhydride is volatilized to generate carbonyl groups, H2 O, CO2 and aromatic benzene
This paper gives a complete analysis method of the kinetics and the pyrolysis mechanism of epoxy glass fiber reinforced plastics, and the method can be applied to other polymer materials to obtain their kinetic information and pyrolysis reaction mechanism
Summary
Glass fiber reinforced plastic generally refers to a composite material with a glass fiber reinforced polymer resin matrix, which is widely used in aviation, aerospace, weapons, chemical, construction, and marine fields considering its good performance in mechanical properties, thermal insulation properties, and corrosion resistance [1,2,3,4,5,6,7,8]. The Friedman method was used to calculate the kinetic parameters of the thermal decomposition of epoxy glass fiber reinforced plastic, and results show that its activation energy ranges from 41.4 to 78.4 kJ/mol. Zheng et al [11,12] used the SDT Q600 synchronous thermal analyzer to study the pyrolysis characteristics of epoxy glass fiber reinforced plastic samples under unirradiated and different irradiation doses, and by using the Friedman and FWO methods, the activation energy was calculated under different material irradiation conditions. In this study, solving the kinetic mechanism of glass fiber reinforced plastics through model fitting methods and exploring its chemical reaction mechanism through evolved gas analysis are what this research will add to the research area of material pyrolysis. This article can provide more guidance information for the study of the thermal stability and combustion behavior of epoxy glass fiber reinforced plastics
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