Modification of Polystyrene/Polybutadiene Block Copolymer Films by Chemical Reaction with Bromine and Effect on Gas Permeability
Abstract
Permeability coefficients (P) for several gases were measured in heterogeneous polystyrene/polybutadiene (PS/PB) block copolymer films before and after reaction with aqueous bromine. Films reacted to low and very high extents exhibited decreases in P and increases in selectivity compared to the starting material. At intermediate reaction extents, effective permeability coefficients in the reacted materials were higher than those in the unmodified films, resulting in membranes which exhibited both selectivity and permeability enhancement relative to the starting PS/PB system. These effects on permeability are the combined result of physical and chemical changes in the block copolymer films caused by the bromination reaction. Keywords: Block copolymers, Membranes, Bromination of polymers, Gas separations, Fluid mechanics, Polystyrene/polybutadiene, Chemical reaction, Gas permeability, Packaging materials, Modification.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 15, 1990
- Accession Number
- ADA223612
Entities
People
- D. H. Rein
- J. Csernica
- R. F. Baddour
- Robert E. Cohen
Organizations
- Massachusetts Institute of Technology