Control Of Pore Size In Tubular Pyrolysis Silicon Based Membrane

The objective of the present study is to demonstate a novel procedure for controling pore size of silicon based inorganic membranes.The silicon based inorganic membranes prepared by the polymerization-pyrolysis process exhibited high permeability, selectiity, and thermal stability. By varying the substituent groups of the trifunctional monomer, silicon based inorganic membranes with different pore size were obtained.The larger substituent groups lead to produce the silicon based inorganic membranes with bigger pore size.But,the smaller sub stituent groups can lead to the molecular sieve membrane. The basic idea of this novel process is that using trifunctional monomer to form structure regular precursors first by stereospecific polymerization,and then pyrolysis them under control conditions,the thermosetting precursors is converted into a rigid inorganic framework by releasing the substituent groups ,leaving open pores that occupied by the substituent groups.The varying size of substituent groups lead to varying pore size. Permeabilities of H2,N2,O2, through si1icon based inorganicmembranes were measured in the room temperature .Experimental datawcre disscused.