Thermo-mechanical responses of liquid-crystal networks with a splayed molecular organization

Grietje N. Mol, Kenneth D. Harris, Cees W.M. Bastiaansen, Dirk J. Broer

Research output: Contribution to journalArticleAcademicpeer-review

146 Citations (Scopus)

Abstract

Films of liquid-crystal networks with a splayed molecular alignment over their cross-section display a well-controlled deformation as a function of temperature. The deformation can be explained in terms of differences in thermal expansion depending on the average molecular orientation of the mesogenic centers of the monomeric units. The thermal expansion of the anisotropic polymers has been characterized as a function of their molecular structure and the polymerization conditions. As a reference, films with an in-plane 90° twist have also been studied and compared with the splayed, out-of-plane molecular rotation. The twisted films show a complex macroscopic deformation owing to the formation of saddle-like geometries, whereas the deformation of the splayed structured is smooth and well controlled. The deformation behavior is anticipated to be of relevance for polymer-based microelectromechanical system (MEMS) technology.

Original languageEnglish
Pages (from-to)1155-1159
Number of pages5
JournalAdvanced Functional Materials
Volume15
Issue number7
DOIs
Publication statusPublished - 1 Jul 2005

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Liquid Crystals
Liquid crystals
liquid crystals
Molecular orientation
Thermal expansion
thermal expansion
Polymers
molecular rotation
saddles
polymers
Molecular structure
microelectromechanical systems
MEMS
molecular structure
polymerization
alignment
Polymerization
Geometry
cross sections
geometry

Cite this

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abstract = "Films of liquid-crystal networks with a splayed molecular alignment over their cross-section display a well-controlled deformation as a function of temperature. The deformation can be explained in terms of differences in thermal expansion depending on the average molecular orientation of the mesogenic centers of the monomeric units. The thermal expansion of the anisotropic polymers has been characterized as a function of their molecular structure and the polymerization conditions. As a reference, films with an in-plane 90° twist have also been studied and compared with the splayed, out-of-plane molecular rotation. The twisted films show a complex macroscopic deformation owing to the formation of saddle-like geometries, whereas the deformation of the splayed structured is smooth and well controlled. The deformation behavior is anticipated to be of relevance for polymer-based microelectromechanical system (MEMS) technology.",
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Thermo-mechanical responses of liquid-crystal networks with a splayed molecular organization. / Mol, Grietje N.; Harris, Kenneth D.; Bastiaansen, Cees W.M.; Broer, Dirk J.

In: Advanced Functional Materials, Vol. 15, No. 7, 01.07.2005, p. 1155-1159.

Research output: Contribution to journalArticleAcademicpeer-review

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