Accession Number : ADA263189


Title :   Selectivity and Permeability of Microporous Block Copolymer Membranes


Descriptive Note : Technical rept.


Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF CHEMICAL ENGINEERING


Personal Author(s) : Rein, D H ; Baddour, R F ; Cohen, R E


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a263189.pdf


Report Date : 16 Apr 1993


Pagination or Media Count : 15


Abstract : A selective solvent was used to develop a uniform microporous structure in a polystyrene-polymethylmethacrylate block copolymer. Pore diameters in the range of 200-500 angstroms were produced. Gas permeation measurements demonstrated a dramatic, five order of magnitude, increase in permeability coefficient associated with the throughgoing microporous structure. These high-flux membranes retained some selectivity for certain gas pairs as expected for transport based on Knudsen diffusion in the porous materials.... Microporous membranes, Gas separations, Knudsen diffusion, Block copolymers.


Descriptors :   *BLOCK COPOLYMERS , *MEMBRANES , MEASUREMENT , PERMEABILITY , STRUCTURES , GASES , TRANSPORT , DIFFUSION , POROUS MATERIALS , SEPARATION , SOLVENTS , COEFFICIENTS , POLYMETHYL METHACRYLATE , POLYSTYRENE , POLYMERS


Subject Categories : Physical Chemistry
      Polymer Chemistry


Distribution Statement : APPROVED FOR PUBLIC RELEASE