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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:09 |
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Conference: Bucharest University Faculty of Physics 2003 Meeting
Section: Polymer Physics
Title:
The Characterization of the Polystyrene by Experimental Study of the Scattered Light in Diluted Solutions of Good Solvents.
Authors:
Livia Constantinescu, C. Berlic, Cristina Miron, Claudia Nastase
Affiliation:
Faculty of Physics, University of Bucharest
E-mail
Keywords:
Abstract:
In the first part of our study we used the method of light scattering for solutions of polystyrene in benzene (good solvent) and in cyclohexan (theta solvent at 34.6 oC).
The concentration domain was between 0.5-4 10-3 g/cm3 and we determined the characteristics of the polymer: the molecular weight, radius of gyration and the second virial coefficient.
In the second part of our work we extended the domain of the concentrations to 0.05-1.1 10-2 g/cm3. Using the asymptotic behavior at zero angle, we determined a polydispersity degree of 1.3.
The experimental results allowed us to obtain the exponent a of the viscometry law (Mark-Kuhn-Houwink equation) which is 0.6 for the polystyrene in benzene.
References:
1. C. Strazielle, H. Benoît, Macromolecules, 8, 203 (1975);
2. C. Loucheux, G. Weill, H. Benoît, J. Chim. Phys., T.55, 7-8, 540 (1958);
3. L.M. Constantinescu, C. Berlic, Metode experimentale in fizica polimerilor. Aplicatii, Editura Universitatii din Bucuresti (1999);
4. L.M. Constantinescu, C. Berlic, Structura polimerilor. Metode de studiu, Editura Universitatii din Bucuresti (2003).
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