Preparation and Properties of Polysaccharide‐Based Epoxy Vitrimers

Abstract

Traditional chemically cross‐linked polymer materials may cause severe environmental pollution and economic losses due to the difficulty of recycling. Vitrimers containing reversible dynamic covalent bonds are processable, recyclable, and self‐healing. In this article, a bio‐based epoxy resin curing agent is synthesized by hydrolysis using cellulose as raw material. The results show that the epoxy vitrimers with the best ratio have a lower topological transition temperature and a fast relaxation time at 140 °C. After soaking in solvent for 90 days, the gel content of the material is greater than 81%. The glass transition temperature of the sample measured by differential scanning calorimetry （DSC) is 83 °C. It also has a high initial decomposition temperature (350 °C) with good flexibility and solvent resistance, showing its good performance as a coating paint.

Fully biobased, catalyst-free vitrimers from tannic acid: a facile combination of mechanical robustness, recyclability and sustainability

“…Fabricating vitrimers from bioresources has been attracting increasing research interest when it comes to sustainability and environmental compatibility. Various bio-resources have been utilized to produce partially or fully bio-based vitrimers with a wide range of mechanical properties, such as plant oils, 26–30 polysaccharides, 31–35 fructose, 36 lignin and lignin derivatives, 37–40 isosorbide, 19 etc. Dynamic transesterification (DTE) appears to be a particularly suitable dynamic covalent chemistry platform for fully green vitrimers due to the wide availability of building blocks from bioresources, such as carboxylic acids, alcohols, phenols, and esters.…”