Plasma modification of polycarbonates

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Authors	ZAJÍČKOVÁ Lenka BURŠÍKOVÁ Vilma PEŘINA Vratislav MACKOVÁ Anna SUBEDI Deepak Prasad JANČA Jan SMIRNOV Sergej
Year of publication	2001
Type	Article in Periodical
Magazine / Source	Surface & coatings technology
MU Faculty or unit	Faculty of Science
Citation
Field	Plasma physics
Description	We deposited protective coatings on polycarbonates from hexamethyldisiloxane (HMDSO) and HMDSO/O2 mixtures by plasma enhanced CVD method. We studied especially deposition rate, optical constants in UV/VIS, film composition and mechanical properties in dependence on rf power and oxygen to HMDSO flow rate ratio. Plasma polymer HMDSO films (PP-HMDSO)showed good transparency in the visible and increased absorption in UV region. The optical constants of HMDSO/O2 films were similar to the tabulated SiO2. In general, the films were characterised by a relative high content of hydrogen (22-66 %) and a carbon content below 20 %. The films deposited at the oxygen to HMDSO flow rate ratio higher than 15 exhibit higher tensile stress and higher hardness than those prepared at ratios of 5-10. The nature of the internal stress changed to compressive for PP-HMDSO. Plasma pretreatment of polycarbonate in argon significantly improved the film adherence especially when low powers and short treatment times were used.
Related projects:	Common laboratories for applied plasma physics and plasma chemistry in PřF and PedF MU, VA Brno and ÚFP AV ČR in Prague Hard and superhard coatings prepared by unconventional plasma processes Plasma deposition of protective coatings: characterisation of prepared films and diagnostics of reactive plasmas used Study of plasmachemical reactions in non-isothermic low pressure plasma and its interaction with the surface of solid substrates