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Pure Appl. Chem. 76(1), 97-104, 2004

Pure and Applied Chemistry

Vol. 76, Issue 1

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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