Dynamics of uniaxially oriented elastomers using broadband dielectric spectroscopy

Lee, HyungKi, Fragiadakis, Daniel, Martin, Darren, Milne, Anthongy, Milne, John and Runt, James (2010) Dynamics of uniaxially oriented elastomers using broadband dielectric spectroscopy. Macromolecules, 43 7: 3125-3127. doi:10.1021/ma100340c

Author Lee, HyungKi
Fragiadakis, Daniel
Martin, Darren
Milne, Anthongy
Milne, John
Runt, James
Title Dynamics of uniaxially oriented elastomers using broadband dielectric spectroscopy
Journal name Macromolecules   Check publisher's open access policy
ISSN 0024-9297
Publication date 2010-04
Sub-type Other
DOI 10.1021/ma100340c
Volume 43
Issue 7
Start page 3125
End page 3127
Total pages 3
Place of publication Washington, United States
Publisher American Chemical Society
Collection year 2011
Language eng
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. Copyright © 2010 American Chemical Society
Keyword Glass-transition temperature
X-ray scattering
Polymer networks
Q-Index Code CX
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published under heading : Communications to the Editor

Document type: Journal Article
Sub-type: Other
Collections: Non HERDC
Australian Institute for Bioengineering and Nanotechnology Publications
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Created: Sun, 18 Apr 2010, 00:02:27 EST