Numéro
J. Phys. I France
Volume 7, Numéro 10, October 1997
Page(s) 1245 - 1258
DOI https://doi.org/10.1051/jp1:1997121
J. Phys. I France 7 (1997) 1245-1258
DOI: 10.1051/jp1:1997121

Experimental Evidence on the Influence of Extended Defects on a Structural Phase Transition: Polymer Chains in a Monomer Matrix

S. Longeville1, J. Even1, M. Bertault1 and F. Moussa2

1  Groupe Matière Condensée et Matériaux URA au CNRS n° 804, Université de Rennes I, Campus de Beaulieu, 35042 Rennes Cedex, France
2  Laboratoire Léon Brillouin (CEA-CNRS), CE Saclay, 91191 Gif-sur-Yvette Cedex, France


(Received 5 June 1997, revised 8 April 1997, accepted 17 June 1997)

Abstract
The influence of the polymerization on the static aspects of the structural phase transition in a monomer-polymer pTS-diacetylene system is studied by neutron scattering. The disorder arises probably from the frustration of the incommensurate modulation present in the pure monomer; the influence of the polymer chains acting as extended defects appears the determining factor in the observed phenomena.


Résumé
Nous étudions les aspects statiques des transitions de phase dans un système mixte monomère-polymère par diffusion de neutrons. Le désordre provient probablement d'une frustration de la modulation incommensurable qui existe dans les cristaux de monomère pur. L'influence des défauts étendus que constituent les chaines de polymètres est le facteur prépondérant qui apparait dans les phénomènes observés.



© Les Editions de Physique 1997

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