Segmental Relaxation in Blends of Polychloroprene and Epoxidized Polyisoprene

C. M. Roland, P. G. Santangelo, Z. Baram, James Patrick Runt

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Dynamic mechanical measurements were conducted over a range of frequencies in the glass transition zone of an epoxidized (25 mol %) polyisoprene (EPI), polychloroprene, and miscible mixtures thereof. The neat polymers had nearly equal glass transition temperatures. Furthermore, they were found to exhibit very similar segmental dynamics, including their segmental relaxation times, functions, and temperature dependencies. Interestingly, however, blends containing a relatively high concentration of the EPI had shorter relaxation times (by up to an order of magnitude) than the neat components; that is, segmental relaxation speeds up upon mixing. This behavior is interpreted in terms of the decrease in intermolecular cooperativity in the mixtures relative to the neat components. The decrease is associated with a large positive excess volume of mixing measured for the blends and the consequent increased unoccupied volume.

Original languageEnglish (US)
Pages (from-to)5382-5386
Number of pages5
JournalMacromolecules
Volume27
Issue number19
DOIs
StatePublished - Sep 1 1994

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Neoprene
Polyisoprenes
Relaxation time
Glass transition
Polymers
Temperature

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

Cite this

Roland, C. M., Santangelo, P. G., Baram, Z., & Runt, J. P. (1994). Segmental Relaxation in Blends of Polychloroprene and Epoxidized Polyisoprene. Macromolecules, 27(19), 5382-5386. https://doi.org/10.1021/ma00097a019
Roland, C. M. ; Santangelo, P. G. ; Baram, Z. ; Runt, James Patrick. / Segmental Relaxation in Blends of Polychloroprene and Epoxidized Polyisoprene. In: Macromolecules. 1994 ; Vol. 27, No. 19. pp. 5382-5386.
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Roland, CM, Santangelo, PG, Baram, Z & Runt, JP 1994, 'Segmental Relaxation in Blends of Polychloroprene and Epoxidized Polyisoprene', Macromolecules, vol. 27, no. 19, pp. 5382-5386. https://doi.org/10.1021/ma00097a019

Segmental Relaxation in Blends of Polychloroprene and Epoxidized Polyisoprene. / Roland, C. M.; Santangelo, P. G.; Baram, Z.; Runt, James Patrick.

In: Macromolecules, Vol. 27, No. 19, 01.09.1994, p. 5382-5386.

Research output: Contribution to journalArticle

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