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Molecular motions in a side‐chain liquid‐crystalline polymethacrylate. A thermally stimulated currents study of the dipolar relaxations in the vitreous and liquid‐crystalline phases and at the glass transition
Author(s) -
Mano João F.,
Correia Natália T.,
Ramos Joaquim J. Moura,
Coates David
Publication year - 1995
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1995.021960717
Subject(s) - mesogen , side chain , polymer , dipole , liquid crystalline , glass transition , phase transition , relaxation (psychology) , materials science , phase (matter) , pendant group , work (physics) , chemical physics , polymer chemistry , liquid crystal , chemistry , thermodynamics , organic chemistry , composite material , physics , psychology , social psychology , optoelectronics
In the present work we report the results of a Thermally Stimulated Discharge Currents (TSDC) study of a side‐chain liquid‐crystalline polymer. The different discharges observed in the TSDC spectrum have been analysed by the thermal sampling technique and have been attributed to specific relaxation mechanisms at the molecular level. A particular feature of the polymer studied in this work is that the mesogenic side group presents both longitudinal and transverse components of the dipole moment, and this seems to be at the origin of the presence of two separated relaxations in the liquid‐crystalline phase.