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Kinetics of the grating formation in holographic polymer-dispersed liquid crystals: NMR measurement of diffusion coefficients

Tang, Mingxue; Redler, Andreas; Topgaard, Daniel LU ; Schmidt, Claudia and Kitzerow, Heinz-S. (2012) In Colloid and Polymer Science 290(8). p.751-755
Abstract
Polymer films with embedded liquid crystal inclusions (polymer-dispersed liquid crystals) are superb composites for addressable windows, flexible displays and optical storage. Their scattering behavior and electro-optic properties depend essentially on the shape and size of the liquid crystal inclusions, which are typically formed by phase separation from a multicomponent homogeneous mixture. Here, pulsed field gradient NMR is used to measure the self-diffusion coefficients of the liquid crystal and a photo-reactive monomer, which compose such a precursor mixture. The kinetics of holographic grating formation in this mixture can be predicted by inserting the NMR diffusion coefficient of the monomer and the polymerization rate in a reaction... (More)
Polymer films with embedded liquid crystal inclusions (polymer-dispersed liquid crystals) are superb composites for addressable windows, flexible displays and optical storage. Their scattering behavior and electro-optic properties depend essentially on the shape and size of the liquid crystal inclusions, which are typically formed by phase separation from a multicomponent homogeneous mixture. Here, pulsed field gradient NMR is used to measure the self-diffusion coefficients of the liquid crystal and a photo-reactive monomer, which compose such a precursor mixture. The kinetics of holographic grating formation in this mixture can be predicted by inserting the NMR diffusion coefficient of the monomer and the polymerization rate in a reaction diffusion model. The ratio of diffusion rate over reaction rate is found to be in the limiting regime in which the kinetics of the grating formation is not sensitive to this parameter. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Holographic polymer-dispersed liquid crystals, Nuclear magnetic, resonance, Diffusion, Diffraction efficiency
in
Colloid and Polymer Science
volume
290
issue
8
pages
751 - 755
publisher
Springer
external identifiers
  • wos:000304153400008
  • scopus:84865126295
ISSN
0303-402X
DOI
10.1007/s00396-012-2623-0
language
English
LU publication?
yes
id
0049d88b-d080-45c3-bae0-0c27e7e3d8d8 (old id 2812880)
date added to LUP
2012-06-25 10:21:52
date last changed
2017-01-01 03:51:16
@article{0049d88b-d080-45c3-bae0-0c27e7e3d8d8,
  abstract     = {Polymer films with embedded liquid crystal inclusions (polymer-dispersed liquid crystals) are superb composites for addressable windows, flexible displays and optical storage. Their scattering behavior and electro-optic properties depend essentially on the shape and size of the liquid crystal inclusions, which are typically formed by phase separation from a multicomponent homogeneous mixture. Here, pulsed field gradient NMR is used to measure the self-diffusion coefficients of the liquid crystal and a photo-reactive monomer, which compose such a precursor mixture. The kinetics of holographic grating formation in this mixture can be predicted by inserting the NMR diffusion coefficient of the monomer and the polymerization rate in a reaction diffusion model. The ratio of diffusion rate over reaction rate is found to be in the limiting regime in which the kinetics of the grating formation is not sensitive to this parameter.},
  author       = {Tang, Mingxue and Redler, Andreas and Topgaard, Daniel and Schmidt, Claudia and Kitzerow, Heinz-S.},
  issn         = {0303-402X},
  keyword      = {Holographic polymer-dispersed liquid crystals,Nuclear magnetic,resonance,Diffusion,Diffraction efficiency},
  language     = {eng},
  number       = {8},
  pages        = {751--755},
  publisher    = {Springer},
  series       = {Colloid and Polymer Science},
  title        = {Kinetics of the grating formation in holographic polymer-dispersed liquid crystals: NMR measurement of diffusion coefficients},
  url          = {http://dx.doi.org/10.1007/s00396-012-2623-0},
  volume       = {290},
  year         = {2012},
}