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Deuteron NMR resolved mesogen vs. crosslinker molecular order and reorientational exchange in liquid single crystal elastomers
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SYSNO ASEP 0463036 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Deuteron NMR resolved mesogen vs. crosslinker molecular order and reorientational exchange in liquid single crystal elastomers Author(s) Milavec, J. (SI)
Domenici, V. (IT)
Zupančič, B. (SI)
Rešetič, A. (SI)
Bubnov, Alexej (FZU-D) RID, ORCID, SAI
Zalar, B. (SI)Source Title Physical Chemistry Chemical Physics. - : Royal Society of Chemistry - ISSN 1463-9076
Roč. 18, č. 5 (2016), s. 4071-4077Number of pages 7 s. Language eng - English Country GB - United Kingdom Keywords liquid single crystal elastomer ; NMR ; liquid crystal ; molecular order ; monomers Subject RIV JJ - Other Materials R&D Projects GA15-02843S GA ČR - Czech Science Foundation (CSF) LD14007 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support FZU-D - RVO:68378271 UT WOS 000369508100082 EID SCOPUS 85000428255 DOI 10.1039/C5CP06207A Annotation Differences in the temperature behaviour of orientational ordering of structurally equivalent side-chain liquid single crystal elastomers (LSCEs), 2 H-labelled in the crosslinker and mesogen, have been studied by deuteron quadrupole-perturbed NMR. The impact of nematic director reorientations on the deuteron NMR spectral shapes was analyzed in terms of discrete reorientational exchange model. This provided for the determination of the degree of nematic director alignment and for the quantification of the influence of the reorientational exchange on the 2H NMR spectra in terms of two parameters, the nematic director orientational dispersion parameter and the motional effectiveness parameter. Comparative analysis of model simulations and experimental spectra reveals that mesogenic molecules in LSCEs exhibit faster reorientational dynamics as compared to crosslinker molecules and that mesogens and crosslinkers exhibit similar and rather substantial static director orientational disorder.
Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2017
Number of the records: 1