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6660036 
Journal Article 
Gas transport and thermodynamic properties of PMMA/PVME blends containing PS-b-PMMA as a compatibilizer 
Moon, EJ; Yoo, JE; Choi, HW; Kim, CK; , 
2002 
Yes 
Journal of Membrane Science
ISSN: 0376-7388 
ELSEVIER SCIENCE BV 
AMSTERDAM 
204 
1-2 
283-294 
English 
WOS:000176449400023 
Gas transport and thermodynamic properties of polymethylmethacrylate (PMMA) blended with polyvinylmethylether (PVME) containing diblock copolymer of styrene and methylmethacrylate (PS-b-PMMA) as a compatibilizer were studied. Phase separation temperatures of PVME blends with styrenic random copolymer containing various amounts of methyl methacrylate (NIMA) were determined to calculate the interaction energies of the binary pairs involved in this system using lattice fluid theory combined with the binary interaction model. The separated phase structure of the blend that is related to interaction energy was controlled with an interfacial agent, i.e. PS-b-PMMA. The average diameter of the dispersed particles in PMMA/PVME blend was decreased for the blends containing PS-b-PMMA from 0 to about 5 parts per hundred (phr) and then leveled off at a fixed value. Accordingly, oxygen and nitrogen gas permeability coefficients of the blend membrane increased with compatibilizer content, until it reached 5 phr and then leveled off. A trade-off between permeability and selectivity for blends containing various amount of compatibilizer was observed. The continuous path from top to bottom of membrane formed by reducing the dispersed particle size might cause an increase of gas permeability at the same blend composition. (C) 2002 Elsevier Science B.V. All rights reserved. 
Compatiblizer; Gas permeation; Interaction energies; PMMA/PVME blends; Styrene-methymethacrylate copolymers