photo-induced deformations in azobenzene-containing side-chain polymers: molecular dynamics study

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ID: 206619
2006
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Abstract
We perform molecular dynamics simulations of azobenzene containing side-chain liquid crystalline polymer subject to an external model field that mimicks the reorientations of the azobenzenes upon irradiation with polarized light. The smectic phase of the polymer is studied with the field applied parallel to the nematic director, forcing the trans isomers to reorient perpendicularly to the field (the direction of which can be assosiated with the light polarization). The coupling between the reorientation of azobenzenes and mechanical deformation of the sample is found to depend on the field strength. In a weak field the original smectic order is melted gradually with no apparent change in the simulation box shape, whereas in a strong field two regimes are observed. During the first one a rapid melting of the liquid crystalline order is accompanied by the contraction of the polymer along the field direction (the effect similar to the one observed experimentally in azobenzene containing elastomers). During the slower second regime, the smectic layers are rebuilt to accomodate the preferential direction of chromophores perperdicular to the field.
Reference Key
j.ilnytskyi2006condensedphoto-induced Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;J.Ilnytskyi;M.Saphiannikova;D.Neher
Journal conference on human factors in computing systems - proceedings
Year 2006
DOI
10.5488/CMP.9.1.87
URL
http://dx.doi.org/10.5488/CMP.9.1.87
Keywords
polymers liquid crystals

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