Skip to Main content Skip to Navigation
Habilitation à diriger des recherches

Etudes structurales et dynamiques par diffusion de neutrons aux petits angles de polymères cristaux liquides

Abstract : The conformation and the dynamics of liquid crystal (LC) polymers are studied by small angle neutron scattering in the isotropic and nematic phases. In the isotropic phase, linear and comb like LC polymers adopt a gaussian conformation. In the nematic phase, linear and side on grafted polymers are confined in extremely long cylinders. For the linear ones this raises to a conformation with abrupt contour reversals (as hairpins) predicted by P.G. de Gennes. The conformation of comb-like polymers is weakly anisotropic. Dynamics studies of these non entangled polymers reveal the existence of clusters due to living interactions between mesogens. The cluster size lies in between the chain size and the sample one. The relaxation of the chain conformation is described in both phases.
Document type :
Habilitation à diriger des recherches
Domain :
Complete list of metadatas

Cited literature [39 references]  Display  Hide  Download

https://tel.archives-ouvertes.fr/tel-00006457
Contributor : Jean-Pierre Cotton <>
Submitted on : Tuesday, July 13, 2004 - 4:47:48 PM
Last modification on : Friday, March 5, 2021 - 3:01:57 PM
Long-term archiving on: : Wednesday, November 23, 2016 - 5:05:54 PM

Identifiers

  • HAL Id : tel-00006457, version 1

Collections

Citation

Annie Brûlet. Etudes structurales et dynamiques par diffusion de neutrons aux petits angles de polymères cristaux liquides. domain_other. Université Paris Sud - Paris XI, 2004. ⟨tel-00006457⟩

Share

Metrics

Record views

312

Files downloads

474