J. Phys. II France
Volume 1, Numéro 10, October 1991
Page(s) 1277 - 1287
DOI: 10.1051/jp2:1991123
J. Phys. II France 1 (1991) 1277-1287

Gelation of the conjugated polymer polydiacetylene P4BCMU

M. Adam1 and J. P. Aimé2

1  Service de Physique du Solide et de Résonance Magnétique, CEA-Saclay, 91191 Gif-sur-Yvette Cedex, France
2  Groupe de Physique du Solide, Université Paris VII, Tour 23, 2, place Jussieu, 75251 Paris Cedex 05, France

(Received 17 April 1991, revised 28 June 1991, accepted 2 July 1991)

The static viscosity and the shear elastic modulus of P4BCMU in toluene in the red phase have been studied at concentrations above the concentration threshold for the gel transition. Two main results are emphasized. The elastic behaviour of P4BCMU gel gives experimental evidence for the scalar percolation theory. The color transition, yellow to red, and the gel transition appear at different temperatures: the color transition is observed at a temperature higher than the gel transition temperature.

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