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

Polymers

Dailyn Guzmán²  Xavier Ramis¹  Xavier Fernández-Francos²  Angels Serra² 

[1] Thermodynamics Laboratory, ETSEIB (Escola Tècnica Superior d’Enginyeria Industrial de Barcelona), University Politècnica de Catalunya, C/Av. Diagonal 647, 08028 Barcelona, Spain; E-Mail:;Department of Analytical and Organic Chemistry, University Rovira i Virgili, C/Marcel•lí Domingo s/n, 43007 Tarragona, Spain; E-Mails:

关键词: thermosets;    thiol;    epoxy resin;    triglycidyl isocyanurate;    click reaction;    latency;   

DOI  :  10.3390/polym7040680

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.