A Novel One-Step Synthesis of Silicon-Containing Arylacetylene Resin Catalyzed by Et2Zn with Excellent Processability and Thermal Properties

摘要

A novel one-step synthesis of silicon-containing arylacetylene resin(PSA)catalyzed by Et2Zn was reported.PSA-Et2Zn was prepared by the reaction between diethynylbenzene and dichlorodimethylsilane in the presence of diethylzinc.The structure of PSA-Et2Zn was determined and the reaction mechanism was proposed.In addition,the processability,thermal curing behavior,and thermal properties were studied.When compared with the zinc powder catalysis method,the Et2Zn catalysis method demonstrates a greater effectiveness in avoiding the formation of olefinic products at the ends of the molecular chain,which can improve thermal capabilities.The results show that PSA-Et2Zn possesses excellent processability and thermal properties.PSA-Et2Zn has a wide processing window of 35~182℃ and the thermal crosslinking reactions of PSA-Et2Zn resin are mild.The cured PSA-Et2Zn shows high thermal stability with a residue yield up to 87.9% at 800℃.Furthermore,the temperature at 5% weight loss in nitrogen and air atmospheres is 584℃ and 539℃,respectively.