STUDIES OF THE CONCENTRATION DEPENDENCE OF THE CONFORMATIONAL DYNAMICS OF SOLUTIONS CONTAINING LINEAR, STAR OR COMB HOMOPOLYMERS.

C. J T Martel, T. P. Lodge, M. G. Dibbs, T. M. Stokich, R. L. Sammler, C. J. Carriere, J. L. Schrag

Research output: Chapter in Book/Report/Conference proceedingConference contribution

34 Scopus citations

Abstract

The concentration dependence of the conformational dynamics of polymer solutions as revealed by measurements of oscillatory flow birefringence (o. f. b. ) has been obtained for narrow-distribution linear, comb and regular-star molecules for concentrations in the range c( eta ) APP 1STH 11. The data obtained show that the relaxation-time spectrum is affected markedly by concentration. The longest relaxation time is affected most; for the linear, comb or 3-armed star polystyrenes studied to date, tau //1 exhibits an exponential dependence on concentration for c( eta ) less than 3. The Muthukumar theory correctly predicts the dependence of tau //1 on concentration for solutions containing linear molecules for which c( eta ) less than equivalent to 5. There is some indication that tau //1 as a function of concentration exhibits two different concentration regimes, one above and one below the onset of significant entanglement effects. The shortest relaxation times are almost unaffected by concentration.

Original languageEnglish (US)
Title of host publicationFaraday Symposia of the Chemical Society
PublisherRoyal Soc of Chemistry
Pages173-188
Number of pages16
Edition18
ISBN (Print)0851866387
StatePublished - Dec 1 1983

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