Reprocessable Epoxy-Anhydride Resin Enabled by a Thermally Stable Liquid Transesterification Catalyst

Area of Science:

• Polymer Chemistry
• Materials Science

Background:

• Epoxy-anhydride resins offer excellent properties but lack reprocessability.
• Existing transesterification catalysts face challenges like poor dispersion and instability.

Purpose of the Study:

• To develop a stable, liquid transesterification catalyst for enhancing epoxy-anhydride resin reprocessability.
• To overcome limitations of current catalysts in dispersion, volatility, and stability.

Main Methods:

• Incorporation of a liquid-state, thermally stable imidazole derivative catalyst into epoxy resins.
• Evaluation of catalyst dispersion at room temperature and structural stability up to 200 °C.
• Assessment of transesterification promotion at elevated temperatures for stress release.

Main Results:

• The imidazole catalyst uniformly disperses in epoxy resins at room temperature.
• The catalyst exhibits high thermal stability (>200 °C) due to synergistic electronic and steric effects.
• Effective promotion of transesterification allows for thermal recycling and reshaping of crosslinked resins.

Conclusions:

• A novel imidazole catalyst significantly enhances the reprocessability of epoxy-anhydride resins.
• This approach improves epoxy resin functionality and expands their application range.
• The catalyst's stability and dispersion overcome limitations of traditional methods.