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Brief overview on 2 H NMR studies of polysiloxane‐based side‐chain nematic elastomers
Author(s) -
Domenici Valentina,
Milavec Jerneja,
Zupančič Blaž,
Bubnov Alexej,
Hamplova Vera,
Zalar Boštjan
Publication year - 2014
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.4092
Subject(s) - mesogen , liquid crystal , elastomer , chemistry , isotropy , side chain , relaxation (psychology) , chain (unit) , thermodynamics , chemical physics , polymer science , liquid crystalline , condensed matter physics , organic chemistry , phase (matter) , polymer , physics , optics , psychology , social psychology , astronomy
This is a brief overview on recent studies on liquid crystalline elastomers (LCEs) based on polysiloxane chain, in the form of monodomain films, selectively 2 H‐labeled in different parts of the LCE samples, i.e. on the crosslinker or mesogenic units. 2 H NMR spectroscopic techniques were used to measure the temperature dependence of the quadrupolar splittings, line widths and relaxation times, T 1 and T 2 . From these data, several information about the orientational order parameter, S , of various LCE fragments, thermodynamic features of the isotropic–nematic transition and main motional processes could be generalized for this type of elastomers. Copyright © 2014 John Wiley & Sons, Ltd.