Smectic C Structure and Backbone Confinement in Side-on Fixed Liquid Crystalline Polymers

The influence of the rate of dilution of the mesogens along the polymer backbone on the conformation and the structure of two different side-on mesogens polysiloxanes are studied using neutron-scattering techniques. The average backbone conformation in the nematic and smectic C phases is deduced fro...

Full description

Saved in:
Bibliographic Details
Published in:Macromolecules 2000-01, Vol.33 (1), p.67-72
Main Authors: Lecommandoux, S, Noirez, L, Achard, M. F, Hardouin, F
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Inorganic and organomineral polymers
Physicochemistry of polymers
Properties and characterization
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The influence of the rate of dilution of the mesogens along the polymer backbone on the conformation and the structure of two different side-on mesogens polysiloxanes are studied using neutron-scattering techniques. The average backbone conformation in the nematic and smectic C phases is deduced from small-angle neutron-scattering measurements. An inversion in the backbone conformation from prolate in the nematic phase to highly oblate in the smectic phase is evidenced. Distribution profiles of polysiloxane main chains are calculated from neutron diffraction experiments in the smectic phase. A transition in the confinement of the main chain within the layers has been demonstrated:  the polymer backbone can be segregated between the layers, but also present in the middle part of the mesogenic layers.
ISSN:0024-9297
1520-5835
DOI:10.1021/ma9911086