Anisotropic cellulose-derived matrix for dispersed liquid crystals

Daniela Filip; Ivo Costa; J. L. Figueirinhas; M. H. Godinho

doi:10.1080/02678290500450758

Anisotropic cellulose-derived matrix for dispersed liquid crystals

Daniela Filip, Ivo Costa, J. L. Figueirinhas, M. H. Godinho

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

Abstract

New cellulose-derived dispersed liquid crystal free-standing thin films were prepared by a shear-casting technique from anisotropic and isotropic solutions of thermotropic (acetoxypropyl)cellulose in N,N-dimethylacetamide with different amounts of the nematic E7. For films prepared from anisotropic solutions, dispersed nematic E7 droplets of micron and submicron size were found to coexist, with the band texture characteristic of polymer liquid crystals after shearing. Mechanical properties including Young's modulus and stress-strain curves were determined along and perpendicular to the shear direction, and revealed the anisotropic behaviour of films prepared from lyotropic solutions. The nematic E7 component appears to promote chain mobility and rearrangement of the polymer matrix and to modify the viscoelastic properties of the matrix.

Original language	English
Pages (from-to)	109-114
Number of pages	6
Journal	Liquid Crystals
Volume	33
Issue number	1
DOIs	https://doi.org/10.1080/02678290500450758
Publication status	Published - 1 Jan 2006

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author = "Daniela Filip and Ivo Costa and Figueirinhas, {J. L.} and Godinho, {M. H.}",

note = "D. F. wishes to thank the Portuguese Science Foundation (FCT) for the fellowship grant SFRH/BPD/19722/ 2004. This work was partially supported by projects POCTI/CTM/56382/2004 and by FCT through Pluriannual contracts with CENIMAT.",

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AU - Filip, Daniela

AU - Costa, Ivo

AU - Figueirinhas, J. L.

AU - Godinho, M. H.

N1 - D. F. wishes to thank the Portuguese Science Foundation (FCT) for the fellowship grant SFRH/BPD/19722/ 2004. This work was partially supported by projects POCTI/CTM/56382/2004 and by FCT through Pluriannual contracts with CENIMAT.

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N2 - New cellulose-derived dispersed liquid crystal free-standing thin films were prepared by a shear-casting technique from anisotropic and isotropic solutions of thermotropic (acetoxypropyl)cellulose in N,N-dimethylacetamide with different amounts of the nematic E7. For films prepared from anisotropic solutions, dispersed nematic E7 droplets of micron and submicron size were found to coexist, with the band texture characteristic of polymer liquid crystals after shearing. Mechanical properties including Young's modulus and stress-strain curves were determined along and perpendicular to the shear direction, and revealed the anisotropic behaviour of films prepared from lyotropic solutions. The nematic E7 component appears to promote chain mobility and rearrangement of the polymer matrix and to modify the viscoelastic properties of the matrix.

AB - New cellulose-derived dispersed liquid crystal free-standing thin films were prepared by a shear-casting technique from anisotropic and isotropic solutions of thermotropic (acetoxypropyl)cellulose in N,N-dimethylacetamide with different amounts of the nematic E7. For films prepared from anisotropic solutions, dispersed nematic E7 droplets of micron and submicron size were found to coexist, with the band texture characteristic of polymer liquid crystals after shearing. Mechanical properties including Young's modulus and stress-strain curves were determined along and perpendicular to the shear direction, and revealed the anisotropic behaviour of films prepared from lyotropic solutions. The nematic E7 component appears to promote chain mobility and rearrangement of the polymer matrix and to modify the viscoelastic properties of the matrix.

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Anisotropic cellulose-derived matrix for dispersed liquid crystals

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