Molecular diffusion in plasma-polymerized tetrafluoroethylene

Journal Article · Sun Nov 01 00:00:00 EST 1992 · Journal of Applied Physics; (United States)

DOI:https://doi.org/10.1063/1.352259· OSTI ID:7038261

Butler, M A; Buss, R J ^[1]

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1. Sandia National Laboratories, Albuquerque, New Mexico 87185 (United States)

Diffusion of an array of molecules in micrometer-thick films of plasma-polymerized tetrafluoroethylene has been measured using an optical interferometric technique. The diffusivity is approximately independent of molecular size up to a molar volume of about 100 cm{sup 3} and drops rapidly for larger molecules. For much larger molecules no penetration of the films is observed. These results suggest that plasma-polymerized tetrafluoroethylene films are heavily cross linked and that this limits the size of the molecules that can penetrate the polymer. The temperature dependence and the molecular size dependence of the diffusivities are discussed in the context of free-volume theory.

• DOE Contract Number: AC04-76DP00789
• OSTI ID: 7038261
• Journal Information: Journal of Applied Physics; (United States), Vol. 72:9; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
POLYMERS
DIFFUSION
CARBON SULFIDES
FILMS
INTERFEROMETRY
MOLECULES
POLYMERIZATION
SIZE
TEMPERATURE DEPENDENCE
CARBON COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
SULFIDES
SULFUR COMPOUNDS
360606* - Other Materials- Physical Properties- (1992-)