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JOURNAL OF POLYMER ENGINEERING VOLUME 19:1, 1999, page 39 ABSTRACT GAS PERMEATION IN A SERIES OF HALOGENATED PLASMA POLYMERS
A series of plasma polymerized thin films was produced from monomers exhibiting varying degrees of chlorinanon and bromination. These films were characterized by scanning electron microscopy and elemental analysis, and were tested for permeability to helium, nitrogen, oxygen and carbon dioxide. Compared to a corresponding non-halogenated plasma polymer, the presence of halogens in the polymer films leads to a considerable barrier quality, with bromine being more effective than chlorine. Segmental mobility as well as fractional free volume considerations are presented to explain permeability differences among the plasma polymers. Activation energies for permeation, generally higher in the halogenated polymers versus the non-halogenated material, are also reported.
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