MODIFICATION METHOD OF INTERPENETRATING POLYMER NETWORK ON SURFACE OF POROUS POLYVINYLIDENE FLUORIDE MEMBRANE

摘要

A modification method of interpenetrating polymer network on the surface of a porous polyvinylidene fluoride membrane, characterized in that, contacting the porous polyvinylidene fluoride membrane with a vinyl alcohol polymer and an aldehyde compound, then contacting it with an amine compound. The amine compound is crosslinked with the polyvinylidene fluoride on the surface of the porous polyvinylidene fluoride membrane, while the hydrophilic vinyl alcohol polymer is crosslinked with the aldehyde compound on the surface of the porous polyvinylidene fluoride membrane. The two non-interfering crosslinking reactions are performed at the same time to interweave, realizing the entanglement of molecules on the surface of the porous polyvinylidene fluoride membrane, and forming a hydrophilic structure with interpenetrating polymer network, thereby achieving the permanent hydrophilicity and solvent tolerance of the porous polyvinylidene fluoride membrane.