Cross-Linking and Evaluation of the Thermo-Mechanical Behavior of Epoxy Based Poly(ionic Liquid) Thermosets

Abstract

Poly(ionic liquids) (PILs) and ionenes are polymers containing ionic groups in their repeating units. The unique properties of these polymers render them as interesting candidates for a variety of applications, such as gas separation membranes and polyelectrolytes. Due to the vast number of possible structures, numerous synthesis protocols to produce monomers with different functional groups for task-specific PILs are reported in literature. A difunctional epoxy-IL resin was synthesized and cured with multifunctional amine and anhydride hardeners and the thermal and thermomechanical properties of the networks were assessed via differential scanning calorimetry and dynamic mechanical analysis. By the selection of suitable hardeners, the glass transition onset temperature (Tg,onset) of the resulting networks was varied between 18 °C and 99 °C. Copolymerization of epoxy-IL with diglycidyl ether of bisphenol A (DGEBA) led to a further increase of the Tg,onset. The results demonstrate the potential of epoxy chemistry for tailorable PIL networks, where the hardener takes the place of the ligands without requiring an additional synthesis step and can be chosen from a broad range of commercially available compounds.

From the Design of Multifunctional Degradable Epoxy Thermosets to Their End of Life

“…Due to their outstanding properties, such as excellent insulation, tunable mechanical performances, and high chemical and thermal resistance, thermoset epoxy resins (TERs) are widely used and represent one of the most important thermosetting polymers. , Among the commercially available TERs, diglycidyl ether bisphenol A (DGEBA) is the most commonly used for automotive, aircraft, coating, and electronic applications. − Despite its advantages, one of the starting precursors of DGEBA, namely, bisphenol A, is reported as an estrogen and androgen receptor antagonist and represents a risk for humans and the environment. − …”

Influence of Anion and Cation Structures on Ionic Liquid Epoxy-Based Vitrimers

“…IL-1 was attained via anion exchange of DiBuIm-Br and subsequent oxidation according to a published procedure and was characterized in a previous publication . Yield: 73%.…”