Synthesis and characterization of novel polyimide-based NLO materials from poly(hydroxy-imide)s containing alicyclic units (II)

Kim, Eunha; Moon, In Kyu; Kim, Hwan Kyu; Lee, Myung‐Hyun; Han, Sunkyu; Yi, Mi Hie; Choi, Kil‐Yeong

doi:10.1016/s0032-3861(98)00821-0

Cited by 35 publications

(13 citation statements)

References 10 publications

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“…From this, we can conclude that the synthesized polyimides presented here have demonstrated excellent second‐order NLO coefficients with reference to the KDP crystal. Further, the d 33 values of the resulting NLO polyimides are much higher than those of the NLO side‐chain polyimides substituted with dialkylaminonitrostilbene system . Among the polyimides, we could notice that the polyimides having PMDI backbone ( P2C1 , P2C2 , and P2C3 ), compared with the polyimides with 6FDA backbone regardless of the chromophores attached, demonstrated excellent d 33 values.…”

Section: Resultsmentioning

confidence: 91%

“…Among the polymers studied, polyimides conjugated with side‐chain chromophores play a vital role in enhancing the long‐term stability at higher temperatures for various applications. This is mainly due to the presence of aromatic rings in polyimides, which serve the purpose of restraining the relaxation of noncentrosymmetric chromophore alignment induced during the field poling …”

Section: Introductionmentioning

confidence: 99%

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Synthesis of chromophores and polyimides with a green chemistry approach for second‐order nonlinear optical applications

Doddamani

Tasaganva²,

Inamdar

2018

Polymers for Advanced Techs

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This article presents the synthesis of nonlinear optical responsive chromophores by adopting a green chemistry approach by coupling N‐methyl‐N‐(2‐hydroxyethyl)‐4‐amino benzaldehyde with barbituric acid, 1,3‐indanedione, and 1,3‐diethyl‐2‐thiobarbituric acid as the acceptors through stilbene linkage. We performed the synthesis in less than 10 minutes at room temperature with water as a solvent without catalyst. Two different side‐chain polyimides were synthesized from poly(hydroxy‐imide)s with chromophores by Mitsunobu reaction. The chromophores were characterized by Fourier transform infrared, 1H NMR, 13C NMR, and elemental analysis. However, the polyimides were characterized by Fourier transform infrared and 1H NMR. The inherent viscosities (ηinh) of polyimides were determined by Ubbelohde viscometer, which ranged between 0.1793 and 0.1890 dL/g. The molecular weights of the polyimides were determined using gel permeation chromatography and were in range of 23 000 to 26 000. Polyimides demonstrated an excellent solubility in polar aprotic solvents, indicating good processability. Thermal behavior of these polyimides was studied by differential scanning calorimetry and thermogravimetric analysis. The Tg's were in the range of 185°C to 255°C. The change in the molecular orientation in the polymer films after electrical poling was ascertained using ultraviolet‐visible spectrophotometer and atomic force microscopy. The thicknesses and refractive indices of the thin films were determined by an ellipsometer. The second harmonic generation coefficients of the corona‐poled polymer films at Topt's, determined by the Maker fringe technique, ranged between 59.33 and 77.82 pm/V. High thermal endurance observed for the polyimides is attributed to the extensive hydrogen bonds in the matrix. The developed polyimides showed no decay in second harmonic generation signals below 110°C, indicating the acceptance for nonlinear optical devices.

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Section: Resultsmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Synthesis of chromophores and polyimides with a green chemistry approach for second‐order nonlinear optical applications

Doddamani

Tasaganva²,

Inamdar

2018

Polymers for Advanced Techs

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“…All the polymerizations proceeded in homogeneous solution and the precipitation was prevented in all cases by adjusting the solvent to monomer ratio. The FTIR spectra (Figs 5–7) showed that aliphatic CH stretching frequencies appeared between 2850–2890 cm −1 , 1720–1730 cm −1 symimide ν(CO), 1725 cm −1 (s) asym imide ν (CO) stretching 1790–1765 cm −1 , CN imide ring‐stretching 1360 cm −1 , whereas imide ring‐deformation appeared near 1070 cm −1 and CN bending at 730–760 cm −1 and the CN peak in the monomers gave two peaks at 1440 and 1660 cm −1 , respectively 34–38…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of novel polyimides starting from 1,2‐bis(p‐dimethylaminobenzylideneimino)alkane homologues and various dianhydrides

Köytepe¹,

Gök²,

Alıcı³

et al. 2004

Polymer International

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The objective of this research was the preparation of polyimides from 1,2‐bis(p‐dimethylaminophenylimino)alkane homologues and various dianhydrides in N‐methylpyrrolidone by one‐stage polycondensation. The monomers were prepared via condensation of p‐dimethylaminobenzaldehyde and the corresponding diamines, 1,4‐diaminobutane, 1,3‐diaminopropane and 1,2‐diaminoethane. The influence of the incorporation of this moiety into the polymer backbone on the properties of the polyimides has been evaluated. The thermogram of the polyimides indicated that PI‐10 to PI‐32 had Tg values ranging from 181 to 290 °C. The inherent viscosities of the polymers ranged from 0.99 to 2.05 dl g−1, and the highest solubility was obtained without significant loss of the thermal properties. Copyright © 2004 Society of Chemical Industry

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“…-O-,-SO2-, -CH2-, NHCO-) or less symmetric links, such as meta-or ortho-catenated aromatic units, (2) introducing bulky pendant groups and biphenyl units onto the backbone, and (3) utilizing fluorinated monomers [12]. One of the most successful approaches to enhance transparency, to decrease the dielectric constant and simultaneously to improve solubility consisted in incorporation of aliphatic monomers in the PI backbone, which lead to development of a new type of PIs, namely aliphatic ones [13][14][15][16][17], but in this case the thermal stability is compromised [14]. Partially aliphatic PIs are occupying an intermediate position between aromatic and aliphatic derivatives; they combine the advantages of both.…”

Section: Introductionmentioning

confidence: 99%

Semi-Alicyclic Polyimides: Insights into Optical Properties and Morphology Patterning Approaches for Advanced Technologies

Barzic¹,

Stoica²,

Hulubei³

2012

High Performance Polymers - Polyimides Based - From Chemistry to Applications

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Synthesis and characterization of novel polyimide-based NLO materials from poly(hydroxy-imide)s containing alicyclic units (II)

Cited by 35 publications

References 10 publications

Synthesis of chromophores and polyimides with a green chemistry approach for second‐order nonlinear optical applications

Synthesis of chromophores and polyimides with a green chemistry approach for second‐order nonlinear optical applications

Synthesis and characterization of novel polyimides starting from 1,2‐bis(p‐dimethylaminobenzylideneimino)alkane homologues and various dianhydrides

Semi-Alicyclic Polyimides: Insights into Optical Properties and Morphology Patterning Approaches for Advanced Technologies

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