Toughening rigid thermoset films via molecular enforced integration of covalent crosslinking and multiple supramolecular interactions

Abstract

Rigid thermosets show great potential application value in several fields; however, enhancing their extensibility without losing the required mechanical strength is always a huge challenge. In this work, a new class of rigid thermosets, poly(triethylenetetramine bisphenol A epoxy phenylimidazole)s, with both multiple supramolecular interactions, including “face–face” π–π stacking, “point–point” hydrogen bond, and ion‐pair electrostatic interaction, and covalent crosslinks is developed by introducing the special functional group 2‐phenylimidazole into the crosslinked thermoset. Owing to the synergistic effect of the strong covalent crosslinks and the multiple supramolecular interactions, synchronously improved tensile strengths and elongation at break have been successfully obtained with these rigid thermosets.

High Proton Conductivity of the UiO-66-NH2-SPES Composite Membrane Prepared by Covalent Cross-Linking

“…Therefore, it is an inevitable choice to dope MOFs into polymers as fillers to obtain MOF-based composite proton exchange membranes with excellent performance. 30−32 Covalent cross-linking can be applied to upgrade the physicochemical and functional characteristics of a gelatin film, 33 enhancing the mechanical properties of thermosetting materials, 34 improving battery efficiency, 35 and constructing high-performance composite membranes. 36 Sun et al 37 fixed ZIF-8 on a CNT surface by in situ synthesis to obtain a twodimensional cross-linked network, and its proton conductivity reached 50.24 mS•cm −1 at 30% RH and 120 °C.…”

“…A composite material is produced by doping MOFs in polymers and the composite material combines the porosity and crystallinity of MOFs with the flexibility and processability of polymers, making the proton transfer performance of the complex material far superior to that of its individual components. Therefore, it is an inevitable choice to dope MOFs into polymers as fillers to obtain MOF-based composite proton exchange membranes with excellent performance. − Covalent cross-linking can be applied to upgrade the physicochemical and functional characteristics of a gelatin film, enhancing the mechanical properties of thermosetting materials, improving battery efficiency, and constructing high-performance composite membranes . Sun et al fixed ZIF-8 on a CNT surface by in situ synthesis to obtain a two-dimensional cross-linked network, and its proton conductivity reached 50.24 mS·cm –1 at 30% RH and 120 °C.…”