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Time-dependent nonl...
Time-dependent nonlinear optical properties of pyroelectric liquid crystalline polymers
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- Örtegren, Jonas (författare)
- Department of Polymer Technology, Royal Institute of Technology, Sweden
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- Busson, Philippe (författare)
- Department of Polymer Technology, Royal Institute of Technology, Sweden
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- Gedde, Ulf W. (författare)
- Department of Polymer Technology, Royal Institute of Technology, Sweden
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- Hult, Anders (författare)
- Department of Polymer Technology, Royal Institute of Technology, Sweden
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- Eriksson, Anders (författare)
- Linköpings universitet,Institutionen för fysik, kemi och biologi,Tekniska högskolan
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- Lindgren, Mikael (författare)
- Linköpings universitet,Institutionen för fysik, kemi och biologi,Tekniska högskolan
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- Arntzén, Per-Otto (författare)
- National Defence Research Establishment, Linköping, Sweden
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- Hermann, David S. (författare)
- Physics Department, Chalmers University of Technology,Göteborg, Sweden
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- Rudquist, Per (författare)
- Physics Department, Chalmers University of Technology,Göteborg, Sweden
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- Lagerwall, Sven T. (författare)
- Physics Department, Chalmers University of Technology,Göteborg, Sweden
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(creator_code:org_t)
- 2011-03-04
- 1999
- Engelska.
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Ingår i: Macromolecular Symposia. - : Wiley. - 1022-1360 .- 1521-3900. ; 148, s. 179-195
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Highly oriented pyroelectric liquid-crystalline polymers were prepared by photopolymerization under the influence of a static electric field from binary mixtures of two acrylate monomers exhibiting chiral smectic C mesomorphism. Both monomers contained nitro groups to yield second order nonlinear optical properties (second harmonic generation) and one of the monomers had two functional groups to yield a crosslinked polymer. The room temperature second order nonlinear susceptibility of the polymers showed during the first two hours a 10 % decrease after which it remained constant during the next 48 days. At elevated temperatures there was a significant difference in the nonlinear optical properties over time between crosslinked and uncrosslinked polymers. The uncrosslinked polymer showed a pronounced loss of second order nonlinear optical activity with time at ≥38°C. The crosslinked polymer showed a much smaller and basically a temperature independent decrease rate in the second order nonlinear optical properties at all the ageing temperatures (23-130°C). Both the loss in mesogen order parameter, very evident for the uncrosslinked polymer, and conformational changes occurring within the mesogens (β mechanism), may account for the observations made.
Nyckelord
- pyroelectric liquid crystalline polymers
- second harmonic generation
- long-term properties
- NATURAL SCIENCES
- NATURVETENSKAP
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- art (ämneskategori)
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Örtegren, Jonas
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Busson, Philippe
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Gedde, Ulf W.
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Hult, Anders
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Eriksson, Anders
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Lindgren, Mikael
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visa fler...
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Arntzén, Per-Ott ...
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Hermann, David S ...
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Rudquist, Per
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Lagerwall, Sven ...
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Macromolecular S ...
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Linköpings universitet