Enhancement in the glass transition temperature in latent thiol-epoxy click cured thermosets
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Tri and tetrafunctional thiol were used as curing agent for diglycidyl ether of bisphenol A (DGEBA) catalyzed by a commercially available amine precursor, LC-80. Triglycidyl isocianurate (TGIC) was added in different proportions to the mixture to increase rigidity and glass transition temperature (T-g). The cooperative effect of increasing functionality of thiol and the presence of TGIC in the formulation leads to an increased T-g without affecting thermal stability. The kinetics of the curing of mixtures was studied by calorimetry under isothermal and non-isothermal conditions. The latent characteristics of the formulations containing amine precursors were investigated by rheometry and calorimetry. The increase in the functionality of the thiol produces a slight decrease in the storage lifetime of the mixture. The materials obtained with tetrathiol as curing agent showed the highest values of Young's modulus and T-g.
CitacióGuzmán, D., Ramis, X., Fernández, X., Serra, À. Enhancement in the glass transition temperature in latent thiol-epoxy click cured thermosets. "Polymers", 01 Gener 2015, vol. 7, núm. 4, p. 680-694.