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Radiotracer measurements of sulphur diffusion in rubbers
Author(s) -
Mozisek M.
Publication year - 1970
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760100613
Subject(s) - polybutadiene , diffusion , activation energy , materials science , natural rubber , thermodynamics , effective diffusion coefficient , sulfur , analytical chemistry (journal) , chemistry , polymer , composite material , organic chemistry , metallurgy , copolymer , physics , medicine , radiology , magnetic resonance imaging
The object of measurement was the diffusion of elemental sulphur labelled with the radioisotope S 35 in typical representatives for various types of rubber. The highest values of diffusion coefficient have been found in cis 1,4 polybutadiene. The lowest measured value was found for butyl rubber. The activation energy, expressing the temperature dependence of the diffusion coefficients, ranges from 4 to 10 kcal mol −1 . For some rubbers studied, the activation energy is to a certain degree dependent upon temperature. The values of the diffusion coefficients and the characteristic constants for their temperature dependence are related to the mobility of the macromolecular segments.