Accession Number : AD0763775
Title : The Effect of the Chemical Nature of High Polymers on Gas and Vapor Transport.
Descriptive Note : Technical rept.,
Corporate Author : NORTH CAROLINA STATE UNIV RALEIGH DEPT OF CHEMICAL ENGINEERING
Personal Author(s) : Stannett,V. T.
Report Date : 01 JUL 1973
Pagination or Media Count : 21
Abstract : Two additional high vacuum permeability stations suitable for time lag measurements of the diffusion constants have been built and are very briefly described. The permeabilities, diffusivities and solubilities of helium, neon, argon, oxygen, nitrogen and carbon dioxide have been measured at various temperatures in polyacrylonitrile. The activation energies, heat of solution and the preexponential factors have been calculated. Abnormally low permeability and diffusion constants were found with high activation energies. Some reasons for this behavior are presented. The corresponding transport behavior of helium, neon, argon, krypton and nitrogen in polystyrene has also been measured and the results presented together with the known values for oxygen, and carbon dioxide. (Modified author abstract)
Descriptors : (*POLYMERS, PERMEABILITY), (*ACRYLONITRILE POLYMERS, PERMEABILITY), DIFFUSION, HELIUM, NEON, ARGON, KRYPTON, OXYGEN, NITROGEN, CARBON DIOXIDE, SOLUBILITY, HEAT OF ACTIVATION, FILMS, TRANSPORT PROPERTIES
Subject Categories : Physical Chemistry
Distribution Statement : APPROVED FOR PUBLIC RELEASE