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Anisotropic light scattering and rheological study of the physical gelation of atactic polystyrene in carbon disulfide
Author(s) -
Lehsaini Nourdinne,
Weill Gilbert,
François Jeanne
Publication year - 1995
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19950930121
Subject(s) - polystyrene , rheology , materials science , anisotropy , light scattering , polymer chemistry , modulus , carbon disulfide , thermodynamics , chemical engineering , scattering , composite material , polymer , chemistry , organic chemistry , optics , physics , engineering
The physical gelation of the solutions of atactic polystyrene (aPS) in carbon disulfide (CS 2 ) is studied by the excess of anisotropic light scattering δH v and by the Theological properties. An abrupt jump of δH v at gelation temperature shows that a part of the chains are stiffened upon gelation. This effect which is independent of aPS molecular weight strongly decreases with concentration. It is well correlated with an abrupt change of the plateau modulus G N which indicates the formation of additional entanglements in the gel phase with respect to the sol. The compatibility of these abrupt jumps with the thermodynamic theories used to interpret the concentration and molecular‐weight dependence of the gelation temperature is discussed.