**2. Materials and Reagent**

Vinyl acetate (VAc), acrylic acid (AA), azodiisobutyronitrile (AIBN), anhydrous methanol, and sodium hydroxide were purchased from Chengdu Kelong Chemical Co., Ltd. (Chengdu, China). Triallyl cyanate (TAC) was obtained from Shanghai McLean Biochemical Technology Co., Ltd. Graphene (Gr) (Shanghai, China) powder was purchased from Jiangsu Xianfeng Nano Material Technology Co., Ltd. (Jiangsu, China). Except for the VAc—which requires distillation in order to remove the polymerization inhibitor before use—and AIBN, which needs recrystallization, the other reagents were used as received.
