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

Abstract A novel one‐step synthesis of silicon‐containing arylacetylene resin (PSA) catalyzed by Et 2 Zn was reported. PSA‐Et 2 Zn was prepared by the reaction between diethynylbenzene and dichlorodimethylsilane in the presence of diethylzinc. The structure of PSA‐Et 2 Zn 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 Et 2 Zn 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‐Et 2 Zn possesses excellent processability and thermal properties. PSA‐Et 2 Zn has a wide processing window of 35∼182 °C and the thermal crosslinking reactions of PSA‐Et 2 Zn resin are mild. The cured PSA‐Et 2 Zn shows high thermal stability with a residue yield up to 87.9 % at 800 °C. Furthermore, the temperature at 5 % weight loss in nitrogen and air atmospheres is 584 °C and 539 °C, respectively.