Dynamics of uniaxially oriented elastomers using broadband dielectric spectroscopy

Hyungki Lee, Daniel Fragiadakis, Darren Martin, Anthony Milne, John Milne, James Runt

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

The effect of uniaxial extension on the relaxation behavior of cross-linked polyisoprene and segmented polyurethane elastomers was investigated with the use of dielectric spectroscopy. A poly(tetramethylene oxide) soft segment polyurethane (PU) with 32.5 wt % of hard segments [4,4'diphenylmethane diisocyanate (MDI) and 1,4-butanediol (BDO) was used in film form. The segmented polyurethane with 32.5 wt % MDI-BDO hard segments undergoes microphase separation when cooled from the one phase melt, resulted in hard domains phase separated from a low-Tg phase, the latter consisted of poly(tetramethylene oxide) (PTMO) soft segments and some, likely short, dissolved hard segments. Segments in the soft phase (soft segments and dissolved hard segments) first became oriented in the deformation direction due to the lower modulus of the soft phase and stress ultimately be exerted on the hard domains. The fragility was found to increase with increasing chemical cross-linking as well as intermolecular hydrogen bonding.

Original languageEnglish (US)
Pages (from-to)3125-3127
Number of pages3
JournalMacromolecules
Volume43
Issue number7
DOIs
StatePublished - Apr 13 2010

All Science Journal Classification (ASJC) codes

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

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    Lee, H., Fragiadakis, D., Martin, D., Milne, A., Milne, J., & Runt, J. (2010). Dynamics of uniaxially oriented elastomers using broadband dielectric spectroscopy. Macromolecules, 43(7), 3125-3127. https://doi.org/10.1021/ma100340c