Carbon Hollow Fiber Levy The Development Of The Pore Membrane

Carbon hollow fiber membrane is a new kind of membrane material withexcellent properties, which enable it possible to be used in the harsh ocassions.In this paper, we mainly wanted to find a feasible and reasonable way toproduce carbon hollow fiber membranes.First, high molecular weight Polyacrylonitrile(PAN) was synthtized bythe aqueous suspension polymerization with the redox initiators, and effects,such as temperature, monomer concentration, initiator concenttation andreaction time were discussed on the molecular weight and conversion ofpolymer. Moreover, the optimal reaction conditions have been found.Second, the rheologic property of PAN-DMAc-PVP casting solution wasstudied. Factors, for example, temperature, monomer concentration and thecontent of additives were discussed, and the optimal spinning parameters havebeen determined. Under this condition, a variety of PAN-based hollow fibermembranes were produced. Moreover, the properties of puxe water flux andreteniion were measured.The PAN-based hollow fiber membranes manufactured above were pre-oxidized in the air at 240℃ for two hours with the samples clipped. The crosssection and the extemal surfaces of the samples were observed by SEMtechnique, and the heat behavior of pre-oxidation process was researched byDSC and TG methods. Then, carbonization was made in the pure nitrigenatmosphere at the temperature of 850℃. The final porous smicthes of thecarbom membranes were formed through the due pre-oxidation andcarbonization techniques. The carbon hollow fiber membranes with twochannels of the finger-like structure have been successfully prepared in ourexperiments.