Studies on nonlinear optical polyurethanes containing heterocyclic chromophores

Tambe, S. M.; Tasaganva, R.G.; Kittur, Arjumand A.; Kulkarni, Suyamindra S.; Inamdar, Sanjeev R.

doi:10.1016/j.molstruc.2010.12.010

Cited by 11 publications

(9 citation statements)

References 36 publications

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“…The second harmonic measurements were performed utilizing the setup described in our previous papers . A Mode‐Locked Nd:YAG laser (Continuum Minilite‐I, 6 ns pulse duration, 28 mJ maximum energy at 1,064 nm, 10 Hz repetition rate) was used as a fundamental light source.…”

Section: Methodsmentioning

confidence: 99%

Enhancement of nonlinear optical and thermal properties of polyurethanes by modifying the chromophores with fused heterocyclic and pyrimidine rings

Doddamani

Rachipudi

Inamdar

2018

Polymer Engineering & Sci

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This article describes the synthesis of substituted triazolo [3,4-b]-thiadiazole heterocycles based nonlinear optical (NLO) responsive chromophores. To enhance the NLO properties of the chromophores, the pyrimidine ring was introduced with an appropriate π-bonding. With these chromophores, different series of polyurethanes were prepared by condensation with tolylene-2,4-diisocyanate and 3,3 0dimethoxy-4,4 0 -biphenylene diisocyanate. The structure of the resulting chromophores and polyurethanes was confirmed using Fourier transform infrared, proton nuclear magnetic resonance, and Carbon Hydrogen Nitrogen (CHN) analyzer. The inherent viscosities (η inh ) of the polyurethanes measured by Ubbelohde viscometer were in the range of 0.2324-0.2760 dl/g. Thermal behavior of the polyurethanes was investigated using differential scanning calorimetry and thermogravimetric analysis. The molecular orientation in polyurethane films was induced by a corona poling, and this was ascertained using ultraviolet-visible spectrophotometer and atomic force microscope. The thicknesses and refractive indices of thin films were determined by an Ellipsometer. Polyurethanes exhibited excellent solubility in most of the common organic solvents. The second harmonic generation (SHG) coefficients (d 33 ) of the poled polyurethanes ranged from 63.20 and 95.32 pm/V at 532 nm. None of the polyurethanes showed SHG decay below 100 C, and retained 95% of the signal even up to 500 h. The resulting enhanced NLO efficiency and longer temporal stability make these polyurethanes as promising candidates for photonic devices. POLYM. ENG. SCI., 59:500-509, 2019.

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Section: Methodsmentioning

confidence: 99%

Enhancement of nonlinear optical and thermal properties of polyurethanes by modifying the chromophores with fused heterocyclic and pyrimidine rings

Doddamani

Rachipudi

Inamdar

2018

Polymer Engineering & Sci

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“…During the synthesis and characterization of polyurethanes, different analytical tools are applied. Although not used very often in polymer analysis [typically involving gel permeation chromatography, differential scanning calorimetry (DSC), dynamic mechanical analysis, and Fourier transform infrared (FTIR) techniques],, fluorescence is an analytical tool that can be used to study the molecular properties of polyurethanes . Polyurethanes can undergo photoinduced reactions such as photoisomerization and photobleaching when exposed to UV irradiation depending on the molecular structure.…”

Section: Introductionmentioning

confidence: 99%

Effect of microstructural arrangement of MDI‐based polyurethanes on their photoproperties

Senevirathna

Amarasinghe

Karunaratne

et al. 2019

J of Applied Polymer Sci

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Among the vast variety of polyurethane applications, several applications use the fluorescing nature of some of the polyurethanes. Even though 4,4′‐methylenebis(phenylisocyanate) (MDI)‐based polyurethanes fluoresce, their applications are rare because of the lack of knowledge about the fluorescence behavior of these polymers. In this study, the fluorophores responsible for the emission spectra of MDI‐based polyurethanes were identified, and their emission behavior was investigated. When excited, these polymers produce two prominent emission peaks located at 356 nm and 423 nm, which are assigned to the radiative relaxation of excited isolated hard segments and excited crystalline hard segment bundles of the MDI‐based polyurethanes, respectively. It was found that both chromophores can be excited by 293 nm UV radiation. The observed intensity variations of the two peaks with exposure time were attributed to the localized UV melting‐assisted migration of isolated hard segments. This migration facilitates the formation of crystalline hard segments. As the two chromophore populations are inversely propositional to each other, the relative intensity of the two emission peaks varies with UV exposure in a similar manner. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47431.

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“…Among these, organic polymeric materials have advantages with considering their easy modied structures, the ability of converting them into thin lms, their high laser damage thresholds, faster response time and others [7]. However, inorganic materials such as dierent nanoparticles play a crucial role in determining their linear and nonlinear optical properties through their surfaces, such as emission behavior and third-order optical nonlinearities [8].…”

Section: Introductionmentioning

confidence: 99%

Determination of Nonlinear Optical Properties of MgO Nanoparticles Doped in Poly (Ether) Urethane

2015

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The third-order optical nonlinearities of poly (ether) urethane open cell (PEUOC)/MgO nanocomposites, dissolved in dimethylformamide are characterized by Z-scan technique with CW Nd:YAG laser at its second harmonic frequency of 532 nm with TEM00 Gaussian prole. The synthesized samples are also characterized by optical microscopy and scanning electron microscopy imaging. The nonlinear refractive indices and nonlinear absorption coecients of the synthesized samples are obtained in the order of 10 −8 cm 2 /W with negative sign and 10 −5 cm/W, respectively. The origin of optical nonlinearity in this case may be attributed due to the presence of strong saturable absorption eect. All the results suggest that the nonlinear coecients of the synthesized samples can be controlled by nanoparticles content into PEUOC. Furthermore, the results show that PEUOC/MgO may be promising candidate for the application to optical limiting in the visible region.

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Studies on nonlinear optical polyurethanes containing heterocyclic chromophores

Cited by 11 publications

References 36 publications

Enhancement of nonlinear optical and thermal properties of polyurethanes by modifying the chromophores with fused heterocyclic and pyrimidine rings

Enhancement of nonlinear optical and thermal properties of polyurethanes by modifying the chromophores with fused heterocyclic and pyrimidine rings

Effect of microstructural arrangement of MDI‐based polyurethanes on their photoproperties

Determination of Nonlinear Optical Properties of MgO Nanoparticles Doped in Poly (Ether) Urethane

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