Ultrasonically induced birefringence in polymer solutions
H. Nomura, T. Matsuoka, and S. Koda
Department of Natural Science, College of Science and
Engineering, Tokyo Denki University, Hatoyama Hiki-Gun Saitama, 350-0394,
Japan
Department of Molecular Design and Engineering,Graduate School of Engineering,
Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8603, Japan
Abstract:
For ultrasonically induced birefringence in polymer solutions, both
the linear sinusoidal birefringence and the nonlinear stationary birefringence
were observed. The sign and value of the stationary ultrasonically induced
birefringence depended on the molecular structure of segment and its
anisotropy in polarizability. Furthermore, no molecular weight dependence
could be observed above the molecular weight 104. The theory
based on the viscoelastic ones using the Rouse-Zimm model could not
explain our experimental results as a whole. These results strongly
suggest that the stationary ultrasonically induced birefringence should
be caused by the local segmental motion of polymer chain in solution.
For all polymer solutions investigated here, the stationary birefringence
per ultrasonic intensity decreased with increasing frequency. This frequency
dependence is not consistent with the present treatment for the ultrasonically
induced birefringence.
*Lecture presented at the European Molecular Liquids
Group (EMLG) Annual Meeting on the Physical Chemistry of Liquids: Novel
Approaches to the Structure, Dynamics of Liquids: Experiments, Theories,
and Simulation,Rhodes, Greece, 7-15 September 2002. Other presentations
are published in this issue, pp. 1-261.
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