Fully Aromatic High Performance Thermoset via Sydnone-Alkyne Cycloaddition

摘要

We have developed an efficient synthetic platform for the preparation of a new class of high performance thermosets based on the 1,3-dipolar cycloaddition of a bifunctional sydnone with a trifunctional alkyne. These processable materials possess outstanding thermal stability, with T_(d5%) of 520 ℃ and a weight loss of ＜0.1% per day at 225 ℃ (both in air). Key to this performance is the stability of the starting functional groups that allows for reactive B-staging via simple thermal activation to give fully aromatic and highly cross-linked polypyrazole-based thermosets.