{
    "protocol": "The hydrophilic polymer network was synthesized by copolymerization of triethoxyvinylsilane (A151) and 2-acrylamido-2-methylpropanesulfonic acid (AMPS) followed by complexation with poly(vinyl alcohol) (PVA).Poly (vinyl alcohol) (PVA-1799) and triethoxyvinylsilane (A151) are mixed with 3-methacryloxypropyltrimethoxysilane (KH570) and 2-acrylamide-2-methylpropane sulfonic acid (AMPS) in a suitable solvent. An initiator, ammonium persulfate (APS), is added to the mixture to initiate the polymerization process. The reaction is carried out under controlled conditions to ensure the formation of hydrophilic polymers with functional groups.Antifogging coating was prepared by thermal polymerization. PVA (10 wt%) aqueous solution was prepared by dissolving 1.0 g PVA in 10 g distilled water and stirred for 2 h at 95°C. 5 wt% AMPS was added to the above PVA solution at 60 °C, and silane coupling agent (A151, 2 wt%) and the initiator APS were added sequentially after AMPS dissolved. The reaction was continued for 2 h at 60 °C. The polymer solution obtained was spread uniformly on the glass surface using drip coating to obtain a coating film. The layer was further dried at 50°C for 2 h to obtain a dried polymer layer (abbr. as PVA/P(A151_n·coAMPS)), where n was the amount of A151. The preparation of PVA/(KH570_n-co-AMPS) layer was the same as that of PVA/P(A151_n-co-AMPS), just by substituting A151 with KH570."
}