{
    "protocol": "To synthesize the hydrophilic/hydrophobic polymer heteronetwork (PVA/PTPM HN), begin with the mixing of hydrophilic poly(vinyl alcohol) (PVA) and hydrophobic poly 3-(trimethoxysilyl) propyl methacrylate (PTPM). Ensure strong bonding by implementing either covalent bonding or topological entanglements with the substrate surfaces. Increase the thickness of the PVA/PTPM HN coating to enhance water absorption capacity, while monitoring for high optical transmittance and integrity against wrinkling and peeling during drying-swelling cycles.1. Dissolve hydrophilic PVA and hydrophobic 3-(Trimethoxysilyl) propyl methacrylate (TPM) monomer in dimethyl sulfoxide (DMSO). 2. Photopolymerize TPM in situ using 365 nm ultraviolet light, confirmed by FTIR through the disappearance of C=C double bond at 1635 cm−1 and the increase in viscosity. 3. Set the mass ratio of PVA to TPM as 7:1. 4. Displace DMSO with water to restore interpolymer hydrogen bonding, forming the hydrophilic PVA network. 5. Allow siloxane moieties on PTPM to hydrolyze and condense, forming the hydrophobic PTPM network that interpenetrates with the hydrophilic PVA network.The synthesis of hydrophilic polymers with functional groups involves the following steps: Dissolve 3.6 g of PVA in 75 mL of DMSO and stir for 2 hours at 95 °C. Add a mixture of 0.5 mL of TPM and 75 mg of DMPA to the solution and stir for 20 minutes in the dark. After defoaming, spread the solution onto glass slides to create a uniform liquid layer with thicknesses of 25, 100, or 200 micrometers using a wet film coater. Irradiate the layer with UV light at a wavelength of 365 nm and power of 0.8 W/cm² for a designated time. Perform solvent exchange in water for an additional 0.5 hours. Finally, dry the PVA/PTPM HN coated substrates at 25 °C for 24 hours."
}