文献类型：期刊文献

英文题名：Low-Temperature Curable Thermosetting Resins with Cycloaddition-Driven Cross-Linking Based on Sydnone and Silylacetylene

作者：Jiang, Fengguang[1];Yang, Yanping[1];Zhang, Yongcheng[1];Liu, Min[1];Qian, Jun[1];Zhou, Quan[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Key Lab Specially Funct Polymer Mat & Related Tech, Minist Educ, Shanghai, Peoples R China

年份：2025

卷号：226

期号：21

外文期刊名：MACROMOLECULAR CHEMISTRY AND PHYSICS

收录：;EI(收录号：20253619094202);WOS:【SCI-EXPANDED(收录号:WOS:001560567800001)】；

基金：This work was supported by the National Natural Science Foundation of China (No. 52173074) and the Fundamental Research Funds for the Central Universities (No. JKD01251701).

语种：英文

外文关键词：1,3-dipolar cycloaddition reaction; low-temperature curable; silicon-alkyne hybrid resin; sydnone

摘要：Silicon-alkyne hybrid resins (PSA) possess considerable potential in aerospace and electronic applications. However, their practical use is limited by high curing temperatures (>350 degrees C) and complex cross-linking processes. To address these challenges, a click chemistry approach based on the 1,3-dipolar cycloaddition of sydnones is introduced to replace the conventional self-curing of alkynes. A monofunctional model compound is synthesized to elucidate the structural evolution during curing. A solution-based prepolymerization strategy is developed to produce B-stage prepolymers capable of efficient cross-linking upon mild thermal activation. This method significantly reduces the curing temperature, minimizes processing risks, and enables precise control over the polymer network. The final cross-linked structure forms stable pyrazole rings with carbon dioxide as the only by-product. The cured resin exhibits excellent thermal stability with a decomposition temperature (T d5) exceeding 450 degrees C, providing a promising strategy for the advancement of PSA resins.