Mechanical and swelling behaviour of crosslinked natural rubber: Consequences of the Flory-Rehner hypothesis

Gregory B. McKenna, Kathleen M. Flynn, Yi Hong Chen

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The Frenkel-Flory-Rehner (FFR) hypothesis that the elastic free energy of a swollen network is balanced by the free energy of mixing has been examined using experiments on dicumyl peroxide crosslinked natural rubber. Swelling was performed in good (benzene) and poor solvent (methyl ethyl ketone, ethyl acetate, acetone) conditions. Crosslink density varied from 2.1×10-5 to 3.0×10-4 mol cm-3. It was found that consistency of the FFR hypothesis with experiment requires the Flory-Huggins X parameter to be dependent upon the crosslink density, ν. An apparently universal relation between the value of Xeff and crosslink density, ν, is proposed. For the natural rubber and solvents studied α appears to be independent of solvent.

Original languageEnglish
Pages (from-to)272-275
Number of pages4
JournalPolymer communications Guildford
Issue number9
StatePublished - Sep 1 1988


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