Transport and Physicochemical Parameters of Polypentenamerстатья

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Дата последнего поиска статьи во внешних источниках: 9 июня 2017 г.

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[1] Transport and physicochemical parameters of polypentenamer / L. E. Starannikova, N. A. Belov, V. P. Shantorovich et al. // Polymer Science, Series A. — 2007. — Vol. 49, no. 5. — P. 509–516. Physicochemical properties of a cis-polypentenamer - a hydrocarbon polymer with a low glass transition temperature (Tg = 168.8 K) - have been studied. Measurements of permeability coefficients P in rubbery material for a wide range of gases (He, H2, O2, N2, CO2, CH4, C2H6, C3H8, n-C4H10) indicate a high permeability of this polymer for which the values of P are only slightly lower then those of the most permeable rubber - poly(dimethylsiloxane). The method of inverse gas chromatography has been employedto estimate solubility coefficients S for n alkanes C3-C10 and cycloalkanes in cis-polypentenamer in the range from 25 to 150 C. It has been shown that the solubility coefficients linearly increase in lnS - (Tcr.*Tcr.) coordinates, where Tcr. is the critical temperature of a solute. In terms of the above correlation, the solubility coefficients of light gases have been estimated and the diffusion coefficients D of gases in the same polymer have been calculated via the formula P=DS. The free volume in cis-polypentenamer has been studied by positron annihilation lifetime spectroscopy. The temperature dependence of the positronium lifetime t(3) that characterizes the size of the free volume element in a polymer demonstrates saturation at the temperature above 250 K. This effect is probably related to a rapid migration of fluctuation holes in the rubber polymer at temperatures remote enough from its glass transition temperature. [ DOI ]

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