Abstract
ABSTRACT The kinetics of the curing reactions of two epoxy resin types, aliphatic epoxy resin (ALER) and aromatic epoxy resin (ARER), were evaluated by FTIR, TGA, DSC, SEM, and XRD characterization techniques. Increased curing times improved the mechanical properties of cured ALER epoxy and improved durability compared to that of cured ARER epoxy resin. Flexural stress and modulus of cured ARER epoxy resin were significantly improved after an increase in the curing time. The flexural strength of ARER epoxy increased by 27.2%, while the ALER epoxy flexural strength increased by 10.1% after 840 h curing time. The glass transition temperature at maximum curing was higher for ARER epoxy (76 °C) than for ALER epoxy (65 °C). The XRD results of epoxy resins showed that crystallinity increased as curing times were increased. The kinetic parameters calculated from the maximum rate of TGA mass losses for both ARER and ALER cured for 840 h were equivalent with rate coefficients, 10 11 ± 2 s − 1 exp − 164 ± 2 kJ mo l − 1 / RT . This indicated that first-order decomposition is rate-determining. Afte curing for 168 h the kinetic parameters were significantly smaller indicating that the epoxy resins are more volatile and the maximum mass-loss rate is both reaction and diffusion rate limiting.
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