Fabrication Of Polyimide Silver/copper Sulfide/coblt Oxide Composit Films

Polyimides that rank among the most heat-resitstant polymerspossesd a number of valuable and unique physico-mechanical, electricaland chemical properties. These characteristics allowed polyimide todominate the applications in many filed. Combining polyimide films withmetal or transition metals oxide or transition metal sulphides nanoparticleswas one of hottest research point in the past several decades because thisclass of materials consist of the advantages of both PI and thenanoparticles moieties and have potential application in catalysis,electronic, magnetic, and optical devices. In other words, this kind ofmaterials has been broadening the range of polyimide's applications filed.The thesis fabricated the polyimide-silvered films contentd threesteps: surface hydrolysis of PI film in alkali solution, ion exchange withsilver ions and reduction the silver ions with a reduction agent calleddimethylamine borane (DMAB). It was shown that dimethylamine boranewas a good reducing agent for silver ions initially complexed with carboxylate anions in the hydrolyzed polyimide layers. We cound get thecomposite films with high reflectivity and low sheet resistance in a shortreduction treatment time. The polyimide composite films also werecharacterized by X-ray diffractions, scanning electron microscopy andtransmission electron microscopy.In this paper, we also prepared the polyimide copper sulfidecomposite films by a new way based on the ion exchange method andinterface reaction.The resultant PI/CuS composite films were verified byXRD, TGA, and DMTA. The composites films also contained the PIexcellent thermal and mechanical properties.The polyimide cobalt oxide composite films also have been preparedvia ion exchange and interface reaction in aqueous solution. The processcontained hydrolyzing the PI film surfaces in aqueous potassiumhydroxide solution and incorporating Co2+into the hydrolyzed layers of PIfilm via subsequent ion exchange and followed by reduction treatmentwith Sodium borohydride (NaBH4). After the reduction of Co2+ions withNaBH4and the spontaneous oxidation of Cobalt metallic nanoparticles inan aqueous solution, PI/Co3O4hybrid films were produced. The filmswere analysised by SEM and TGA. The films' surface morphologyprepared under different conditions was also observed.