Enhancement in the Glass Transition Temperature in Latent Thiol-Epoxy Click Cured Thermosets

Identificador:  imarina:5133337

Handle: https://hdl.handle.net/20.500.11797/imarina5133337

Autors:  Guzman, Dailyn; Ramis, Xavier; Fernandez-Francos, Xavier; Serra, Angels

Resum:
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 (Tg). The cooperative effect of increasing functionality of thiol and the presence of TGIC in the formulation leads to an increased Tg 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 Tg.