A highly heat-resistant phthalocyanine resin based on a bio-based anethole. (15th August 2021) - Zhang, Heng
Graphical abstract: Highlights: A phthalonitrile monomer (A-PN) derived from anethole has been synthesized in a high yield. The cured PA-PN displays high thermostability with a Tg (> 450 °C) and a carbon yield of 72% at 1000 °C. PA-PN has potential application as an ablation-resistant coating in aerospace industry. Abstract: A phthalonitrile-containing monomer derived from a plant oil (anethole) has been successfully synthesized by a facile two-step reaction in an overall yield of 84%. Upon high temperature, this monomer is converted to a cured phthalocyanine resin in the presence of a catalyst, 4, 4′-bis(3-aminophenoxy)diphenyl sulfone ( m -BAPS ). Such a cured resin displays good thermostability including high glass transition temperature ( Tg > 450 °C), low thermal expansion coefficient (CTE, near 62.99 ppm °C −1 from 25 to 400 °C) and high char yield (>72% at 1000 °C). These data are comparable to those of the most of the common phthalocyanine resins derived from the fossil resource, suggesting that the phthalonitrile-containing monomer is a suitable precursor for the preparation of the ablation-resistant materials used on the surface of the spacecrafts.