TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The protective gas is nitrogen gas, helium gas, neon gas, argon gas, krypton gas or xenon gas.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The initiator is a photo-initiator (comprising dimethylol propionic acid (preferred), 1-hydroxycyclohexyl phenyl ketone or 2-methyl-1-(4-(methylthio)-phenyl)-2-morpholino-propiopheno) or a thermo-initiator (comprising chloride gas, bromine gas, organic peroxide or azo initiator).    TECHNOLOGY FOCUS - POLYMERS - Preferred Method: The step of polymerizing the first monomer with the second monomer to form the interpenetrating polymer network comprises either: putting the mixture into a protective gas, and using UV light to irradiate the mixture for a period to polymerize the first monomer with the second monomer under the photo-initiator, where the period is 30 minutes to 2 hours; or putting the mixture into a protective gas, and heating the mixture at a temperature for a period, to polymerize the first monomer with the second monomer under the thermo-initiator, where the temperature is 40-80 degrees C, and the period is 0.5-24 hours. The step of mixing the first monomer, the second monomer and the initiator to form the mixture comprises mixing polyethylene glycol (200) dimethacrylate with methoxy polyethylene glycol (350) monoacrylate with a predetermined ratio to form a middle mixture, and then adding lithium perchlorate and dimethylol propionic acid into the middle mixture. Preferred Components: The molecular structure of the interpenetrating polymer network is a linear and open loop structure, or a branched structure. The molecular weight of the first monomer or the second monomer is 200-600. The first monomer is preferably polyethylene glycol (200) dimethacrylate, the second monomer is preferably methoxy polyethylene glycol (350) monoacrylate, and the interpenetrating polymer network is of formula (-(CHk-CH(C(=O)O-(CHk-CHk-O-)m-CHk-)-)a-(CHk-CH(C(=O)-C(=O)-(-(CH(CHk-)-)x-(CHk-CH(C(=O)-CH2-(CH(CHk-)-)z-))y-))-)b-(CHk-CH(C(=O)-C(=O)-(CH(-(CHk-CH(C(=O)-C(=O)-(CH(CHk-)-)q-))p-)-CHk-)r-))c-).a, b, c, p, q, r, x, y and z = integers; andk = text missing or illegible when filed. EXAMPLE - Polyethylene glycol (200) dimethacrylate was mixed with methoxy polyethylene glycol (350) monoacrylate according to polyethylene glycol (200) dimethacrylate which was less than or equal to 50 wt.% of methoxy polyethylene glycol (350) monoacrylate, thus forming a first mixture, and then dimethylol propionic acid was added into the first mixture to form a mixture, where dimethylol propionic acid is 0.1 wt.% of methoxy polyethylene glycol (350) monoacrylate. The mixture was put onto a Teflon (RTM: PTFE) plate in nitrogen gas and UV light was used with a wavelength of 365 nm to irradiate the mixture for 60 minutes to substantially polymerize methoxy polyethylene glycol (350) monoacrylate with polyethylene glycol (200) dimethacrylate, followed by drying for 8 hours at 80 degrees C to obtain interpenetrating polymer network.