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Issue 40, 2020
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Deuteron NMR investigation on orientational order parameter in polymer dispersed liquid crystal elastomers

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Abstract

Polymer-dispersed liquid crystal elastomers have been recently introduced as a thermomechanically active composite material, consisting of magnetically oriented liquid crystal elastomer particles incorporated in a cured polymer matrix. Their thermomechanical properties are largely governed by the degree of imprinted particle alignment, which can be assessed by means of deuterium perturbed 2H-NMR. Spectra of samples with various degrees of imprinted particle alignment were recorded and the results simulated using the discrete reorientational exchange model developed for determining the dispersion of liquid crystal elastomer's domain orientational distribution. We show that the model can be applied to measure the orientational distribution of embedded liquid crystal microparticles and successfully determine the orientational order parameter in the composite system. Thermomechanical measurements correlate well with the obtained results, thus additionally confirming the validity of the applied method.

Graphical abstract: Deuteron NMR investigation on orientational order parameter in polymer dispersed liquid crystal elastomers

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Article information


Submitted
05 Aug 2020
Accepted
05 Oct 2020
First published
06 Oct 2020

Phys. Chem. Chem. Phys., 2020,22, 23064-23072
Article type
Paper

Deuteron NMR investigation on orientational order parameter in polymer dispersed liquid crystal elastomers

A. Rešetič, J. Milavec, V. Domenici, B. Zupančič, A. Bubnov and B. Zalar, Phys. Chem. Chem. Phys., 2020, 22, 23064
DOI: 10.1039/D0CP04143B

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