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Consequences of Tacticity on the Growth and Permeability of Hyperthin Polyelectrolyte Multilayers
- Lin, Cen, Yi, Song, Regen, Steven L.
- Langmuir 2016 v.32 no.2 pp. 375-379
- anions, carbon dioxide, cations, hydrogen, models, nitrogen, permeability, polymethylmethacrylate
- A series of polyanions and polycations have been synthesized from atactic, syndiotactic, and isotactic forms of poly(methyl methacrylate) and used to construct polyelectrolyte multilayers (PEMs). Polymer tacticity has been found to have a large influence on film growth but only a slight effect on H₂/N₂ permeation selectivities and no significant influence on CO₂/N₂ permeation selectivities. The permeances of H₂, CO₂, and N₂ across those PEMs exhibiting the highest H₂/N₂ selectivities were found to vary by as much as factors of 3, 6, and 5, respectively, depending on the tacticities employed. A simple model that accounts for the strong dependency of film growth on tacticity is presented.