2 2 azobis 2 methylpropionitrile aibn

Iron(III) acetylacetonate (Fe(acac)₃, 0.02 mol L⁻¹), (isocyanoimino) triphenylphosphorane (IITP, 0.0125 mol L⁻¹), diethyl phosphite (DEP, 0.05 mol L⁻¹), and 2,2′-azobis (2-methylpropionitrile) (AIBN, 0.02 mol L⁻¹) were purchased from Sinopharm Chemical Reagent Co., Ltd. (Shanghai, China) and diluted with toluene. Triisobutyl aluminum (AlⁱBu₃, TIBA), triethyl aluminum (AlEt₃, TEA), and diisobutyl aluminum hydride (AlⁱBu₂H, TDBAH) were purchased from the Macklin and diluted to 1.0 mol L⁻¹ solutions in toluene. Polymerization grade isoprene (IP) and 1,3-butadiene (BD) were supplied by Qingdao Ludong Gas Co., Ltd. (Qingdao, China). Among them, BD was refined by successively passing through two columns packed with activated molecular sieves (4 Å) and KOH, respectively, and IP was dried over CaH₂, and then distilled before use. Hexane and toluene were distilled over sodium-benzophenone prior to use. Other reagents and solvents were commercially available and used without purification.

Methylvinyl MQ silicone resin (MVMQ) with a vinyl group content of 0.08 mol/100 g was obtained from Dayi Chemical Industry Co., Ltd. (Yantai, China), the mole ratio of M:Q is 0.8:1. Methyl methacrylate, butyl methacrylate, isopropanol, and 2,2′-azobis(2-methylpropionitrile) (AIBN) were purchased from Sinopharm Chemical Reagent Co., Ltd. (Shanghai, China). Phenylmethylsilicone oil (PSO) with a viscosity of 30 mPa·s was obtained from CINDA Chemical Co., Ltd. (Bengbu, China). Acetone, toluene, xylene, ethanol, and acetylacetonate were supplied by Yongda Chemical Reagent Company (Tianjin, China). The compound 2-hydroxyethyl methacrylate phosphate (HEMAP) was supplied by YINCHANG XINCAI Company (Shanghai, China). The above chemicals were used for synthesis and related coating preparation, which were applied as received without any further purification. In addition, the commercial silicone resin was used for preparing the control FR coating, including the following raw materials: 10,000 mPa·s of hydroxyl-terminated polydimethylsiloxane (PDMS) from Dayi Chemical Industry Co., Ltd., tetraethylorthosilicate (TEOS) from Kemiou Chemical Co., Ltd. (Tianjin, China), and bismuth neodecanoate (BiND) from Deyin Chemical Co., Ltd. (Shanghai, China).