Synthesis and characterization of photocrosslinkable functional polymer having pendant chalcone moiety

Balaji, R.; Nanjundan, S.

doi:10.1016/s1381-5148(01)00062-1

Cited by 41 publications

(25 citation statements)

References 23 publications

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“…The aromatic carbon attached to ester oxygen atom is observed at 156.44 ppm. Chemical shifts of other aromatic and ethylenic group carbons are observed between 145.99 and 121.55 ppm 22 .…”

Section: Nmr Spectramentioning

confidence: 98%

Synthesis and Studies on Non-Linear Optical Property of New Chalcone Based Polymers

2017

Chem Sci Trans

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Abstract:A new series of non linear optical (NLO) copolyesters have been synthesized by solution polycondensation method. The two diols namely 2,6 bis(4-methoxy-3-hydroxybenzylidene)-3-methylcyclohexanone and 1-(3-hydroxyphenyl)-3-(4-methoxy-3-hydroxyphenyl)-prop-2-en-1-one, isopthaloyl chloride and succinyl, oxalyl and glutaryl chlorides were employed in the synthesis of the six copolyesters. Claisen-Schmidt condensation reaction was employed in synthesizing these two monomer diols. The formed polymeric materials were characterized by involving viscosity measurements, solubility study and FT-IR, 1 H NMR, 13 C NMR and UV-Visible spectroscopic techniques. Thermal transitions of these six copolyesters were recorded in an inert nitrogen atmosphere using Thermogravimetric Analysis. The second harmonic generation (SHG) efficiency of these copolyesters was measured by the standard powder technique using Nd-YAG laser and they were found to be NLO active.

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“…The aromatic carbon attached to ester oxygen atom is observed at 156.44 ppm. Chemical shifts of other aromatic and ethylenic group carbons are observed between 145.99 and 121.55 ppm 22 .…”

Section: Nmr Spectramentioning

confidence: 98%

Synthesis and Studies on Non-Linear Optical Property of New Chalcone Based Polymers

2017

Chem Sci Trans

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“…This shows that the photocrosslinking occurs through one-step 2p þ2p cycloaddition and not via triplet (T) state. 28 …”

Section: Photocrosslinking Studiesmentioning

confidence: 99%

Photocrosslinkable phosphorus containing homo‐ and copolyesters: Synthesis, characterization, and photosensitive properties

Kaniappan

Murugavel

2008

J of Applied Polymer Sci

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A new series of homo-and copolyphosphoramide esters containing pendant chlorine group was synthesized from dihydroxy chalcones, N-(4-chlorophenyl)phosphoramidic dichloride, and terephthaloyl chloride by interfacial polycondensation technique. The diol monomers were prepared by condensing 4-hydroxy benzaldehyde and 3-methoxy-4-hydroxybenzaldehyde with 4-hydroxy acetophenone. The synthesized monomers and polymers were characterized by UV, IR and 1 H, 13 C, and 31 PNMR spectroscopic techniques. Molecular weight of the polymers was determined by gel permeation chromatography. The thermal properties of the polymers were studied by thermogravimetric analysis and differential scanning calorimetry under nitrogen atmosphere. The photo-crosslinking ability of the polymers in various solvents was observed with UV spectrophotometer. The photocrosslinking proceeds via 2p þ2p cycloaddition reaction of a, b-unsaturated carbonyl group. The comparison study on the rate of photocrosslinking of homo and copolymers was also carried out. The chemical and physical properties of these polyesters are compared with those of the unsubstituted polyesters and the results are discussed herein.

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“…The decrease in the peak near 985 cm À1 and shift or broadening of the peak near 1660 cm À1 would indicate the disappearance of the double bond in the chalcone derivative. 13,14,[26][27][28] The shift and broadening of the peak near 1660 cm À1 would originate from the decrease in conjugation of the double bond and the carbonyl group due to cycloaddition (photo-dimerization) reaction of the double bond in the chalcone derivative. In the FT-IR spectra of the irradiated polymer films, other peaks except above two peaks based upon the photoreaction of the chalcone derivative did not change remarkably.…”

Section: Photoreaction Of Chalcone Derivatives In Polyimidesmentioning

confidence: 99%

Photo-alignment Properties of Main-Chain Liquid-Crystalline Polyimides Containing Chalcone Derivative

Mutoh

Nakao

Koide

2005

Polym J

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ABSTRACT:We investigated photo-alignment properties of main-chain polyimides prepared from acid anhydrides [4,4 0 -(hexafluoro-isopropylidene) diphthalic anhydride (6FDA) or 4,4 0 -biphthalic anhydride (BPDA)] and diamine derivatives containing a chalcone group. The polyimides in the film state were irradiated with linearly polarized UV (LPUV) light under different conditions. The liquid-crystalline (LC) cell was fabricated from the polyimide film irradiated with LPUV light. A mixture of a low molecular liquid crystal (4-cyano-4 0 -n-pentylbiphenyl: 5CB) and a dichroic dye was filled in the LC cell. 5CB in the LC cell was easily aligned perpendicular to the electric vector of the incident LPUV light. [DOI 10.1295/polymj.37.162] KEY WORDS Chalcone / Liquid-Crystalline Polymer / Photo-alignment / Polyimide / Alignment of liquid-crystalline (LC) molecules is important for liquid-crystalline displays (LCDs). Rubbing has been mainly employed for the uniaxial orientation of the LC molecules. However, rubbing has many disadvantages for LCDs such as generation of electrostatic charge and dust. Therefore, many methods of alignment technique for LC molecules focus on rubbing free methods. Photo-alignment procedure is a rubbing free method and is investigated as one of candidates that overcome the generation of electrostatic charge and dust for the rubbing process. 1,2The photo-alignment procedure is based on photochemical reactions such as photo-isomerization, photo-dimerization (photo-crosslinking) and photodecomposition.3-5 Photo-dimerization of photosensitive groups in polymers is employed to obtain a stable alignment of LC molecules. 2,[6][7][8][9][10][11][12] It is desirable that photo-dimerization occurs by the exposure of relatively longer wavelength of the UV light to avoid partial degradation of polymers by the irradiation.13 Photoreaction of chalcone moieties takes place by the irradiation with relatively longer wavelength of the UV light. Non-mesogenic photosensitive polymers containing chalcone derivatives have been studied for the photo-alignment film. 13-19The alignment of LC molecules is easily improved by the surface of LC polymers that exhibit a mesophase. This idea arises from the simple role of solubility for organic compounds, that is, like dissolves like. We already investigated thermal and photo-alignment properties of side-chain LC methacrylate polymers and side-chain polyimides bearing the chalcone derivative in the side chain. [20][21][22] Generally, main-chain polyimides demonstrate good thermal and mechanical properties based upon the rigid rod-like chemical structure of the polymer backbone. Therefore, main-chain polyimides would be suitable candidates for the polymeric materials applied to the photo-alignment film, because many polyimide derivatives have been used as an alignment film of LCDs owing to excellent thermal and mechanical properties.In this study, we investigate the extent of photoreaction of the chalcone-based main-chain polyimides prepared from two anhydride compounds [4,4 0 -(...

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Synthesis and characterization of photocrosslinkable functional polymer having pendant chalcone moiety

Cited by 41 publications

References 23 publications

Synthesis and Studies on Non-Linear Optical Property of New Chalcone Based Polymers

Synthesis and Studies on Non-Linear Optical Property of New Chalcone Based Polymers

Photocrosslinkable phosphorus containing homo‐ and copolyesters: Synthesis, characterization, and photosensitive properties

Photo-alignment Properties of Main-Chain Liquid-Crystalline Polyimides Containing Chalcone Derivative

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