Consequences of Tacticity on the Growth and Permeability
of Hyperthin Polyelectrolyte Multilayers
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Abstract
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 H<sub>2</sub>/N<sub>2</sub> permeation
selectivities and no significant influence on CO<sub>2</sub>/N<sub>2</sub> permeation selectivities. The permeances of H<sub>2</sub>, CO<sub>2</sub>, and N<sub>2</sub> across those PEMs exhibiting
the highest H<sub>2</sub>/N<sub>2</sub> 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
