Tailoring Linear and Nonlinear Optical Properties of a Side‐Chain Liquid Crystalline Azo‐Polymethacrylate

Alicante, Raquel; Cases, R.; Villacampa, Belén; Oriol, Luis

doi:10.1002/macp.201000238

Cited by 2 publications

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References 34 publications

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“…At this point, one main question arising is if the mentioned optical anisotropy has its counterpart in the NLO response. We have recently reported7 the biaxial NLO response of preirradiated and poled polymers with push–pull azo chromophores in the side chain (bearing piperazine and CN as donor and acceptor groups, respectively). So, we set out to check if an analogous biaxiality can be detected in the azopolymeric films studied here.…”

Section: Resultsmentioning

confidence: 99%

“…However, if in‐plane optical anisotropy is produced before the poling,7 the symmetry of the induced non‐linear susceptibility tensor is changed, and more measurements are needed to characterize it. In the studies gathered in the present work, some of poled films belong to C 2v point group symmetry and five non‐zero non‐linear coefficients are needed to describe the NLO response.…”

Section: Methodsmentioning

confidence: 99%

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Matrix Order Influence on the Non‐Linear Optical Properties of Dispersed Chromophore‐Azopolymer Systems

Alicante

Cases

Villacampa

et al. 2012

Macro Chemistry & Physics

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Azopolymers with moderate non‐linear optical (NLO) response are used as host matrices for a highly efficient molecule. The second harmonic intensity generated at room temperature by these binary systems increases noticeably by adding an irradiation step (406 nm) to the corona poling process. The free volume increase due to “trans‐cis” photoisomerization of the side‐chain azo moieties allows to align the NLO chromophores and causes, at least partially, this enhancement. In order to investigate the role of guest–host interactions on the NLO response, different matrix arrangements have been induced and different d33/d.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Matrix Order Influence on the Non‐Linear Optical Properties of Dispersed Chromophore‐Azopolymer Systems

Alicante

Cases

Villacampa

et al. 2012

Macro Chemistry & Physics

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Synthesis and phase behaviour of a homologous series of polymethacrylate-based side-chain liquid crystal polymers

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Inkster

Martínez‐Felipe

et al. 2012

European Polymer Journal

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The non-isothermal kinetic analysis of the isotropic-melt to liquid crystalline phase transition of novel liquid crystalline ionogenic copolymers, LCI, the 10-(4-methoxyazobenzene-4'-oxy)decyl methacrylate]-co-2-(acrylamido-2-methyl-1-propanesulfonic acid)s, 10-MeOAzB/AMPS, copolymers, has been performed based on calorimetric experiments at different cooling rates. A classical nonisothermal crystallisation methodology, based on Avrami's equations, was applied and it has shown that the formation of the mesophases from the isotropic state occurred close to the thermodynamic equilibrium and can be described with high accuracy by using different kinetic parameters. The results evidence the presence of several individual processes in the formation of liquid crystalline phases from the melt and a strong dependence of phase transition rates and activation energies with acid contents. In addition, the decrease in the phase transition rate is related to a decrease in orientational entropy and the final inhibition of the liquid crystal behaviour is ascribed to an exponential increase in the activation energy of the phase transition, promoted by strong acid aggregation. An optimum composition of the 10-MeOAzB/AMPS copolymers to achieve the dual characteristics of LCI (ionogenic and liquid crystalline behaviour) requires acid concentrations capable of promoting structure-forming effects on the LC phases and the evolution of phase separated morphologies. I have submitted a manuscript entitled "A kinetic study of the formation of smectic phases in novel liquid crystal ionogens" for consideration for publication in the European PolymerJournal. The manuscript describes the melt-liquid crystal transition of a set of novel liquid crystal side chain copolymers containing sulfonic acid groups having application potential as anisotropic polymer electrolyte membranes. Due to the relevance of the structure-properties relations in these materials, it is important to describe the successive processes involved in the formation of the mesomorphic templates from the isotropic phase. The study of the nonisothermal calorimetric transition carried out in this paper has proved to be useful to describe the forming role of the acid groups on the stabilisation of the liquid crystal phase.The manuscript contains original material which has not been published nor is being considered for publication elsewhere.I look forward to hearing from you in due course. AbstractThe non-isothermal kinetic analysis of the isotropic-melt to liquid crystalline phase transition of novel liquid crystalline ionogenic copolymers, LCI, the 10-(4-methoxyazobenzene-4'-oxy)decyl methacrylate]-co-2-(acrylamido-2-methyl-1-propanesulfonic acid)s, 10-MeOAzB/AMPS, copolymers, has been performed based on calorimetric experiments at different cooling rates. A classical non-isothermal crystallisation methodology, based on Avrami's equations, was applied and it has shown that the formation of the mesophases from the isotropic state occurred close to the thermodynamic...

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Tailoring Linear and Nonlinear Optical Properties of a Side‐Chain Liquid Crystalline Azo‐Polymethacrylate

Abstract: El artículo seleccionado no se encuentra disponible por ahora a texto completo por no haber sido facilitado todavía por el investigador a cargo del archivo del mismo.

Cited by 2 publications

References 34 publications

Matrix Order Influence on the Non‐Linear Optical Properties of Dispersed Chromophore‐Azopolymer Systems

Matrix Order Influence on the Non‐Linear Optical Properties of Dispersed Chromophore‐Azopolymer Systems

Synthesis and phase behaviour of a homologous series of polymethacrylate-based side-chain liquid crystal polymers

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