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

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 similar to 182 degrees C 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 degrees C. Furthermore, the temperature at 5 % weight loss in nitrogen and air atmospheres is 584 degrees C and 539 degrees C, respectively.

Automated summary

A novel method of one-step synthesis of silicon-containing arylacetylene resin catalyzed by Et2Zn is reported. PSA-Et2Zn is prepared by the reaction of diethynylbenzene with dichlorodimethylsilane in the presence of diethylzinc, and the structure and reaction mechanism are determined. The Et2Zn catalysis method shows a greater effectiveness in avoiding the formation of olefinic products and improving thermal capabilities compared to the zinc powder catalysis method.