@article{erlat_wang_spontak_tropsha_mar_montgomery_vogler_2000, title={Morphology and gas barrier properties of thin SiOx coatings on polycarbonate: Correlations with plasma-enhanced chemical vapor deposition conditions}, volume={15}, ISSN={["0884-2914"]}, DOI={10.1557/jmr.2000.0103}, abstractNote={Plasma-enhanced chemical vapor deposition of SiOx coatings on thermoplastics provides a viable route for production of transparent composite materials with high fracture toughness and high gas barrier properties, which are important considerations in the food packaging and biomedical device industries. By examining several series of systematically varied SiOx/polycarbonate composites, we have identified design correlations between coating characteristics (thickness, density, surface roughness, and O2 transmission) and deposition conditions (time, power, pressure, and flow rates). Of particular interest is the observation that the thermal activation energy for O2 permeation through these composites increases (by up to 17 kJ/mol) as their barrier efficacy increases.}, number={3}, journal={JOURNAL OF MATERIALS RESEARCH}, author={Erlat, AG and Wang, BC and Spontak, RJ and Tropsha, Y and Mar, KD and Montgomery, DB and Vogler, EA}, year={2000}, month={Mar}, pages={704–717} }
 @article{erlat_spontak_clarke_robinson_haaland_tropsha_harvey_vogler_1999, title={SiOx gas barrier coatings on polymer substrates: Morphology and gas transport considerations}, volume={103}, ISSN={["1089-5647"]}, DOI={10.1021/jp990737e}, abstractNote={Plasma-enhanced chemical vapor deposition (PECVD) of SiOx thin coatings on polymer surfaces yields tough hybrid materials with the gas barrier properties and transparency of glass. Combination of these properties makes these materials ideally suited for food packaging and biomedical device applications. In this study, we employ a Non-Parametric Response Surface Methods optimization to identify the Magnetron-PECVD conditions responsible for superlative SiOx barrier coatings on poly(ethylene terephthalate) (PET). Oxygen and water vapor permeances of optimized PET/SiOx composites produced by hexamethyldisiloxane and trimethylsilane have been measured as functions of temperature and are found to exhibit Arrhenius behavior. The thermal activation energy for water vapor permeation, unlike that for oxygen permeation, depends on barrier performance and increases by as much as 20 kJ/mol with an increase in barrier efficacy. Examination of these materials by phase-imaging atomic force microscopy and energy-filtered...}, number={29}, journal={JOURNAL OF PHYSICAL CHEMISTRY B}, author={Erlat, AG and Spontak, RJ and Clarke, RP and Robinson, TC and Haaland, PD and Tropsha, Y and Harvey, NG and Vogler, EA}, year={1999}, month={Jul}, pages={6047–6055} }