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Sorption and Diffusion of Normal Hydrocarbons in Natural Rubber

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Title: Sorption and Diffusion of Normal Hydrocarbons in Natural Rubber
Authors: Kawakami, Mitsuyasu / Kagawa, Shuichi
Issue Date: Jul-1980
Publisher: 長崎大学工学部 / Faculty of Engineering, Nagasaki University
Citation: 長崎大学工学部研究報告, (15), pp.101-108; 1980
Abstract: Solubility and diffusion coefficients of normal C2-C6 hydrocarbons in unvulcanized natural rubber have been determined. Data on concentration dependence of the solubility constant could be correlated by S=S0 exp(αc) and the parameter α are related to the Flory-Huggins interaction parameter χ approximately by α=2χ+1. The concentration dependence of diffusion coefficient are fitted by the expression D=D0(1-αc) exp (βc) derived from a first-approximation free volume theory. The diffusion coefficient, D0 extrapolated to zero concentration and its activation energy decrease with increasing molecular size up to C3 and reach a constant value for C4 and higher hydrocarbons. The parameter β is almost constant for C4-C6 hydrocarbons. It is demonstrated that these hydrocarbons would move through polymeric media like a needle in concert with the thermal motion of polymer segments and only the free volumes larger than the effective cross-sectional diameter of the diffusant molecule is available for diffusion.
URI: http://hdl.handle.net/10069/23991
ISSN: 02860902
Type: Departmental Bulletin Paper
Text Version: publisher
Appears in Collections:No.15

Citable URI : http://hdl.handle.net/10069/23991

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