A relaxation study of poled nonlinear optical polymers by infrared reflection-absorption spectroscopy

Chen, J.I; Marturunkakul, S.; Chen, Y.M; Jeng, Ru‐Jong; Kumar, Jayant; Tripathy, Sukant K.

doi:10.1016/0014-3057(94)90263-1

Cited by 4 publications

(1 citation statement)

References 29 publications

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“…Poled polymeric materials [1][2][3][4][5][6][7][8] containing dipolar chromophores have been studied extensively because of their potential applications in efficient, ultrafast and low-voltage integrated electro-optical devices. Dipolar chromophores can be incorporated into macroscopic environment in a variety of ways.…”

Section: Introductionmentioning

confidence: 99%

Electric Poling and Relaxation Studies of PMMA Thin Films Containing Diaminopyrazole Derivatives as Dipolar Chromophores

Kumar¹

2013

J. Res. Updates Polym. Sci.

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Vacuum-deposited thin films of polymethylmethacrylate (PMMA) doped by varying concentrations (2-10 % by weight of polymer) of some 3,5-diaminopyrazole derivatives as dipolar chromophores were prepared to study their relaxation behaviour . Poling of thin films was carried out using multi-point corona-poling technique to orient dipolar chromophores in proper aligned position. Poling and depoling behaviours of these thin films have been investigated by UV/Vis absorption spectra. For each chromophore, poling efficiency was found to increase with poling voltage as well as poling temperature up to a certain limit retaining the properties of thin films. Maximum value of concentration dependent order parameter was obtained at temperature slightly lower than glass transition temperatures of corresponding guesthost matrices. After 300 hrs. of poling under the conditions (5 kV, near Tg, 30 min.), the decayed amounts of order parameters at room temperature were within the range 25-38 % of the initial value for various guest-host systems. Relaxation behaviour of poling-induced chromophore alignment has also been studied at elevated temperature.

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Section: Introductionmentioning

confidence: 99%

Electric Poling and Relaxation Studies of PMMA Thin Films Containing Diaminopyrazole Derivatives as Dipolar Chromophores

Kumar¹

2013

J. Res. Updates Polym. Sci.

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Investigation of dipole orientation in a side-chain second-order nonlinear optical poly(urethane-imide) by real-time variable temperature FT-IR spectroscopy

Sui

Wang

Yin

et al. 2001

Chemical Physics Letters

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Enzymatically Synthesized Photodynamic Polyaniline Containing Azobenzene Groups

et al. 1998

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A novel polyaniline containing azo groups has been synthesized using horseradish peroxidase catalyzed oxidative free radical coupling of 4,4′-diaminoazobenzene in the presence of hydrogen peroxide. The spectral changes observed indicate polymerization accompanied by trans-cis isomerization, leading to structural constraints in the growing polymer chain. This soluble azo polymer consists of azo groups in the main chain as well as in the side chain. Upon photoexcitation of the polymer in solution, the chromophores undergo structural photoisomerization. The polymer relaxes to a conformation having spectral features identical to those of the conformation prior to photoexcitation if the excitation is carried out within the trans absorption band. Photoexcitation at the cis absorption band or thermal kinetic randomization of the chromophore conformation in the polymer in solution results in relaxation of the structural constraints, which leads to a different constrained conformation.

show abstract

A relaxation study of poled nonlinear optical polymers by infrared reflection-absorption spectroscopy

Cited by 4 publications

References 29 publications

Electric Poling and Relaxation Studies of PMMA Thin Films Containing Diaminopyrazole Derivatives as Dipolar Chromophores

Electric Poling and Relaxation Studies of PMMA Thin Films Containing Diaminopyrazole Derivatives as Dipolar Chromophores

Investigation of dipole orientation in a side-chain second-order nonlinear optical poly(urethane-imide) by real-time variable temperature FT-IR spectroscopy

Enzymatically Synthesized Photodynamic Polyaniline Containing Azobenzene Groups

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