Patent ID: 9556354
Date: 2017-01-31
CPC Classifications: B05D,C08J,C08K,C08L,C09D

Claim:
1. A method for fabricating a semicrystalline polymer / graphene oxide composite film, comprising: providing a polymer/graphene oxide casting solution by dissolving a polymer in a first solvent to obtain a mixture solution, adding a graphene oxide solution into the mixture solution, and stirring until uniform wherein the graphene oxide solution comprises a second solvent and graphene oxide dispersed in the second solvent, wherein the polymer is polyvinyl alcohol; performing a film forming procedure by coating the polymer/graphene oxide casting solution on a substrate to form a first film on the substrate wherein the graphene oxide in the first film has a layered structure and distributed in the polymer; performing a crystallization procedure by drying the first film with heat to form the first film having a first semicrystalline polymer wherein the first semicrystalline polymer has a porous structure and the first semicrystalline polymer and graphene oxide are distributed uniformly in the first film with respect to each other so as to have the first semicrystalline polymer exist between graphene oxide and graphene oxide also exist between the first semicrystalline polymers; and performing a recrystallization procedure by having the composite film having the first semicrystalline polymer undergo heat treatment to induce the first semicrystalline polymer comprising polyvinyl alcohol between adjacent layers of graphene oxide to form a second semicrystalline polymer so as to obtain a composite film having the first semicrystalline polymer and the second semicrystalline polymer, wherein the second semicrystalline polymer fills and seals the porous structure of the first semicrystalline polymer to block gas from flowing through and to increase a length that gas passes from one side of the composite film to the other side of the composite film, and said composite film has a weight ratio of the semicrystalline polyvinyl alcohol to graphene oxide of the composite film being 1000:1˜50:1, and is characterized by an X-ray powder diffraction pattern comprising peaks at 20.1±0.2, 22.5±0.2 and 29.5±0.2 2-theta degree.