Abstract
The block copolymers of isoprene and 4- (2-isopropoxydimethylsily1) styrene are prepared by anionic living polymerization. A new attempt was performed to make microporous membranes from a film of the block copolymer with well-defined chain structure. This method involves casting a block copolymer film with a microphase-separated lamellar structure, fixation of one microdomain by cross-linking between the polymer chains, oxidative decomposition of the other microdomain, and leaching out the degraded low molecular weight compounds from the inside of micropores formed by oxidation. The microstructure of the porous membrane can be controlled through these procedures by the morphology of the segregated microphase of the block copolymers.
