Time-Dependent Properties of Epoxy Resin with Imidazolium Ionic Liquid
Journal of Applied Polymer Science 2021
Eduardo Fonseca, Vinicius Demetrio da Silva, S. C. Amico, Līva Pupure, Roberts Joffe, Henri Stephan Schrekker

This study investigates creep and viscoelastic behavior of the diglycidyl ether of bisphenol A (DGEBA) epoxy resin and triethylenetetramine (TETA) system containing an imidazolium ionic liquid (IL), the 1-n-butyl-3-methylimidazolium chloride (C4MImCl). Different time-dependent analysis methods are studied using data from tensile creep, tensile creep/recovery, and three-point and four-point flexural creep tests of epoxy with 1.0 or 4.0 phr of IL. From the results, the composition containing 1.0 phr of C4MImCl, cured at 60°C, presented greater viscoelasticity and crosslink density compared to compositions cured at 30 and 40°C, which was attributed to higher free volume and higher molecular mobility induced by the presence of the IL. In tensile creep tests using the stepped isostress method (SSM), no important degrading effects were found after the addition of 1.0 phr of IL over long time periods. This composition also showed the best overall performance in flexural SSM creep tests.

Atslēgas vārdi
ionic liquids | resins | thermosets | viscosity and viscoelasticity

Fonseca, E., da Silva, V., Amico, S., Pupure, L., Joffe, R., Schrekker, H. Time-Dependent Properties of Epoxy Resin with Imidazolium Ionic Liquid. Journal of Applied Polymer Science, 2021, Vol. 138, No. 46, Article number 51369. ISSN 0021-8995. Pieejams: doi:10.1002/app.51369

Publikācijas valoda
English (en)
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