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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-24 23:58 |
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Conference: Bucharest University Faculty of Physics 2003 Meeting
Section: Polymer Physics
Title:
A Particular Type of Light Scattering in Polymer Solution. Critical Opalescence.
Authors:
Livia Constantinescu, C. Berlic, Cristina Miron, Claudia Nastase
Affiliation:
Faculty of Physics, University of Bucharest
E-mail
Keywords:
Abstract:
We made an experimental study of critical opalescence phenomenon for solutions of polystyrene (with molecular weight 2.8 105 and polydispersity degree 1.3) in cyclohexan for the domain of concentration 2-5 10-3 g/cm-3.
We measured the critical temperature for each solution and by its dependence on concentration we obtained the critical concentration.
It was verified that the Debye equation, which gives the dependence of the intensity of the scattered light on the diffusion angle, is satisfied.
The dimensions of the molecules obtained from the asymmetry of the critical opalescence corresponds with those obtained from viscometry measurements.
References:
1. P. Debye, J. Chem. Phys., 31, 680 (1959);
2. L.M. Constantinescu, C. Berlic, Metode experimentale in fizica polimerilor. Aplicatii, Editura Universitatii din Bucuresti (1999);
3. L.M. Constantinescu, C. Berlic, Structura polimerilor. Metode de studiu, Editura Universitatii din Bucuresti (2003).
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