Infrared spectra of deuterated polymethyl methacrylates

Nagai, Hiroshi; Watanabe, Haruaki; Nishioka, Atsuo

doi:10.1002/pol.1962.1206217436

Cited by 26 publications

(15 citation statements)

References 3 publications

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“…The vertical lines correspond to the varying IR absorption bands during recovery as assigned in Figure 14. α represents the first carbon atom that is attached to the functional group COOCH 3 ) and (O)CH 3 strongly overlap around the band at 1450 cm -1 [102,103,107]. The peak at 1485 cm -1 can be assigned to the α-CH 3 asymmetric deformation vibration of PMMA [102,103,107].…”

Section: Ftir Resultsmentioning

confidence: 96%

“…IR absorption peaks that change over time are assigned to the corresponding molecular vibration modes as described below and tabulated in Table III. According to Nagai et al, the bands at 1150 and 1194 cm -1 are associated with coupled vibrations of skeletal stretching and internal C−H deformation modes, and the band at 1244 cm -1 is associated with the coupled C−C−O and C−O stretching vibrations [102,103]. However, the bands between 1150 and 1300 cm th minute are respectively the first spectrum and the last one acquired after 30 minutes irradiation relative to the spectrum of the pristine sample.…”

Section: Ftir Resultsmentioning

confidence: 99%

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Spectroscopic studies of the mechanism of reversible photodegradation of 1-substituted aminoanthraquinone-doped polymers

Hung

Bhuyan

Schademan

et al. 2016

The Journal of Chemical Physics

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The mechanism of reversible photodegradation of 1-substituted aminoanthraquinones doped into poly(methyl methacrylate) and polystyrene is investigated. Time-dependent density functional theory is employed to predict the transition energies and corresponding oscillator strengths of the proposed reversibly-and irreversibly-damaged dye species. Ultraviolet-visible and Fourier transform infrared (FTIR) spectroscopy are used to characterize which species are present. FTIR spectroscopy indicates that both dye and polymer undergo reversible photodegradation when irradiated with a visible laser. These findings suggest that photodegradation of 1-substituted aminoanthraquinones doped in polymers originates from interactions between dyes and photoinduced thermally-degraded polymers, and the metastable product may recover or further degrade irreversibly. INTRODUCTIONOrganic materials have a broad range of applications such as high-resolution fluorescence microscopy [1][2][3][4][5][6][7], second harmonic generation (SHG) microscopy [8][9][10][11][12], dye sensitized and polymer solar cells [13][14][15][16][17], solid state dye/organic lasers [18][19][20], and organic light emitting diodes [21,22], to name a few. Photostability of organic compounds and polymers is often a requirement for applications incorporating light-matter interaction [2-4, 6, 8, 18-20, 23-30]. When a material undergoes photodegradation, its characteristic properties deteriorate over time, which is referred to as decay; the reverse change in the characteristic properties of the material is referred to as recovery. Though photodegradation is often irreversible, the recovery process has been observed from a large variety of materials, typically involving polymers and often together with dyes, with various experimental techniques when the photodegraded materials are kept in dark for a long enough time, typically hours to days [30][31][32][33][34][35][36][37][38][39][40][41][42][43][44].Amplified spontaneous emission (ASE) of disperse orange 11 (DO11) doped in poly(methyl methacrylate) (PMMA) bulk sample was observed to fully recover in the dark about 40 hours after photodegradation when irradiated with a 532 nm second harmonic Nd:YAG picosecond laser [33]. This self-healing phenomenon was also observed in various anthraquinone derivatives doped in PMMA and polystyrene (PS) thin films [41,42] and DO11 doped in MMA-styrene copolymers thin films [42,45] probed with transmittance image microscopy and ASE. The photodegraded thin film samples are often observed to recover partially, which suggests there exists both reversible and irreversible photodegradation. The lack of evidence for linear dichroism during photodegradation measurements eliminates orientational hole burning as the mechanism causing reversible photodegra- [38,42,46,[50][51][52][53][54], they have failed to elucidate the underlying mechanism.Several hypotheses of the mechanism responsible for reversible photodegradation in DO11/PMMA have been proposed, including intramolecular proton transfer and ...

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Section: Ftir Resultsmentioning

confidence: 96%

Section: Ftir Resultsmentioning

confidence: 99%

Spectroscopic studies of the mechanism of reversible photodegradation of 1-substituted aminoanthraquinone-doped polymers

Hung

Bhuyan

Schademan

et al. 2016

The Journal of Chemical Physics

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“…[1][2][3][4][5] The object of most of these investigations was to describe the dependence of the IR absorption characteristics in terms of the stereoregular nature of the polymer chain. Sayyah et al 6 studied the IR spectra of PMMA samples doped with some luminescent materials.…”

Section: Introductionmentioning

confidence: 99%

Infrared spectroscopic studies of poly(methyl methacrylate) doped with a new sulfur‐containing ligand and its cobalt(II) complex during γ‐radiolysis

Sayyah

El-Shafiey

Barsoum

et al. 2003

J of Applied Polymer Sci

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Infrared (IR) spectroscopy studies were performed for poly(methyl methacrylate) (PMMA) samples doped with an organic ligand or its cobalt(II) complex after the extraction of the dopant during ␥-radiolysis. There were no drastic changes in the IR absorption band position, but noticeable changes in the intensities were found. The relative transmission of IR absorption bands, such as those at 750, 840, 1065, and 1388 cm Ϫ1 , were measured according to the transmission of the carbonyl group band at 1717 cm Ϫ1. The degradation and recombination mechanism of different groups in the polymeric chain or backbone during radiolysis could be explained by the behavior of the relative transmission data for each group with increasing exposure dose. The tacticity of the PMMA samples was unchanged during radiolysis, and they were found to be syndiotactic. This was confirmed by the IR J values for different PMMA samples before and after irradiation. The protection efficiency of the organic ligand and its cobalt(II) complex was also investigated, and it was found that the organic ligand was more protective than the cobalt(II) complex for PMMA samples against ␥-rays.

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“…The infrared absorption characteristics of poly (methyl methacrylate) (PMMA) have been the subject of several investigations [1][2][3][4][5]. The object of most of these investigations was to describe the dependence of the IR absorption characteristics in terms of the stereoregular nature of the polymer chain.…”

Section: Introductionmentioning

confidence: 99%

Infrared Studies on Polymethyl Methacrylate Doped with a Sulphur-Containing Ligand and Its Cobalt (II) Complex During Gamma Radiolysis

Sayyah

Khaliel

El-Shafiey

et al. 2005

International Journal of Polymeric Materials

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Infrared spectroscopic studies were performed for poly(methyl methacrylate) samples doped with an organic ligand (N,N-dioxaloyl benzenesulphonyl-N,Ndioxaloylthiocarbazide) and its cobalt (II) complex during gamma radiolysis after extraction of the dopant. There are no drastic changes in the IR-absorption band positions, but noticeable changes in the intensities are found. The relative transmission of IR-absorption bands such as bands at 750, 840, 1065, and 1388 cm À1 were measured relative to the transmission of the carbonyl group band at 1717 cm À1 . The degradation and recombination mechanism of different groups in the polymeric chain or backbone during radiolysis are suggested by the behavior of the relative transmission data for each group with increasing exposure dose. The tacticity of the PMMA sample was unchanged during radiolysis and was found to be syndiotactic. This fact is confirmed by measuring the IR J-values for different PMMA samples before and after irradiation. The protection efficiency of the organic ligand and its cobalt (II) complex were also investigated and the organic ligand is a more protective material than the cobalt (II) complex

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Infrared spectra of deuterated polymethyl methacrylates

Cited by 26 publications

References 3 publications

Spectroscopic studies of the mechanism of reversible photodegradation of 1-substituted aminoanthraquinone-doped polymers

Spectroscopic studies of the mechanism of reversible photodegradation of 1-substituted aminoanthraquinone-doped polymers

Infrared spectroscopic studies of poly(methyl methacrylate) doped with a new sulfur‐containing ligand and its cobalt(II) complex during γ‐radiolysis

Infrared Studies on Polymethyl Methacrylate Doped with a Sulphur-Containing Ligand and Its Cobalt (II) Complex During Gamma Radiolysis

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