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Tack energy and switchable adhesion of liquid crystal elastomers

Corbett, DR and Adams, JM (2013) Tack energy and switchable adhesion of liquid crystal elastomers Soft Matter, 9, 1151. pp. 1151-1163.

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The mechanical properties of liquid crystal elastomers (LCEs) make them suitable candidates for pressure sensitive adhesives (PSAs). Using the nematic dumbbell constitutive model, and the block model of PSAs, we study their tack energy and the debonding process as could be measured experimentally in the probe-tack test. To investigate their performance as switchable PSAs we compare the tack energy for the director aligned parallel, and perpendicular to the substrate normal, with that for the isotropic state. We find that the tack energy is larger in the parallel alignment than the isotropic case by over a factor of two. The tack energy for the perpendicular alignment can be 50% less than the isotropic case. We propose a mechanism for reversibly switchable adhesion based on the reversibility of the isotropic to nematic transition. Finally we consider the influence of several material parameters that could be used to tune the stress–strain response.

Item Type: Article
Divisions : Surrey research (other units)
Authors : Corbett, DR and Adams, JM
Date : 1 April 2013
DOI : 10.1039/c2sm26868j
Depositing User : Symplectic Elements
Date Deposited : 28 Mar 2017 14:14
Last Modified : 24 Jan 2020 11:57

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