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The Journal of Chemical Physics
May 8, 2004
Volume 120, Issue 18, Pages 8841-8852
© 2004 American Institute of Physics.
This article may be downloaded for personal use only. Any other use
requires prior permission of the author and the American Institute
of Physics. The following article appeared in
S. Peng et al., J.
Chem. Phys. 120(8), 8841 (2004)
doi: 10.1063/1.1697386
PACS: 78.35.+c, 61.25.Hq, 82.70.Gg, 64.70.Ja
An investigation of a sol-gel/melt transition: The
poly(ethyleneoxide)/methanol/LiClO4 system
Shufu Peng, J. C. Selser, R. Bogoslovov, and G. Piet
Department of Physics, University of Nevada, Las Vegas, Las Vegas, NV 89154-4002, USA
(Received 2 September 2003; accepted 16 February 2004)
Abstract:
The crossover behavior of 50 000 molar mass poly(ethylene
oxide)/methanol solutions from dilute solution to the melt/gel was
examined. At first this behavior was investigated without LiClO4
and then reexamined with LiClO4. To better understand
this behavior, the dependencies of dynamic light scattering
(specifically, photon correlation spectroscopy) measurement results
on polymer concentration, on the scattering wave vector and on
temperature, and the dependence of static light scattering results
on the scattering wave vector were studied. This study produced
interesting and important results about network structure and
behavior in poly(ethylene oxide) solutions and melts generally and
about the effects of LiClO4 on this structure and
behavior more particularly.
Article Outline:
I. Introduction and background
II. Experiment
A. Materials and sample preparation
B. PCS measurements
C. PCS measurement analyses
III. Results and discussion
A. PEO/methanol solutions without salt
B. PEO/methanol solutions with salt
IV. Conclusions
Acknowledgements
References
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