Raman spectra and physical structure of cellulose triacetate

Firsov, S. P.; Zhbankov, R. G.

doi:10.1007/bf00663171

Cited by 17 publications

(16 citation statements)

References 6 publications

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“…As discussed, the water content was 2.4% in the atmospheric condition, Figure 1 shows Im[ (3) ] spectrum of a CA film in the fingerprint region. The result agrees well with the reported Raman spectrum of CA [26][27][28][29][30][31]. The assignment is listed in Table 1.…”

Section: Resultssupporting

confidence: 91%

Dynamical study of the water penetration process into a cellulose acetate film studied by coherent anti-Stokes Raman scattering (CARS) microspectroscopy

Fujisawa

Ohno

Kaneyasu

et al. 2016

Chemical Physics Letters

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The penetration process of water into a cellulose acetate (CA) film was traced in real time by coherent anti-Stokes Raman scattering (CARS) microspectroscopy. The C=O stretch mode was red-shifted due to hydrogen-bond formation. We also found that two Raman bands at 1605 cm-1 and 1665 cm-1 emerged only in the early stage of the water penetration process. Based on the combined analysis of the experimental and computational studies, these bands at 1605 cm-1 and 1665 cm-1 were assigned as the OH bend mode due to hydrogen-bonded penetrated water and hydrogen-bonded OH groups in pyranose rings, respectively.

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Section: Resultssupporting

confidence: 91%

Dynamical study of the water penetration process into a cellulose acetate film studied by coherent anti-Stokes Raman scattering (CARS) microspectroscopy

Fujisawa

Ohno

Kaneyasu

et al. 2016

Chemical Physics Letters

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“…They are possibly ascribed to the vibrations of the bonds within the CH 3 CO groups, particularly the deformation vibrations of C=O bonds in ester groups, i.e. COO groups (Firsov and Zhbankov 1982;Socrates 2001). As shown in Fig.…”

Section: Resultsmentioning

confidence: 98%

“…Moreover, the band at 1,437 cm -1 is more intensive with increasing DS Ac of cellulose acetates. This band can be assigned to the deformation vibrations of CH 3 -groups within acetyl groups (Firsov and Zhbankov 1982;Socrates 2001). In contrast, the intensity of Scheme 1 Deacetylation of highly acetylated cellulose using aqueous NaOH solution or HMDA/H 2 O with R = Ac or H according to DS Ac (Schenzel and Fischer 2001).…”

Section: Resultsmentioning

confidence: 98%

“…However, cellulose acetate has seldom been characterized via Raman spectroscopy (Firsov and Zhbankov 1982;VanderHart et al 1996). Raman spectroscopy, as a rapid and non-destructive method providing sensitive characterization, has been applied in characterizing cellulose and cellulose derivatives for years (Atalla 1976;Atalla et al 1980;Schenzel et al 2005;Yuen et al 2009;Zhang et al 2010).…”

Section: Introductionmentioning

confidence: 98%

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FT Raman spectroscopic investigation of cellulose acetate

2011

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This study reports on a new method characterizing cellulose acetates and determining the contents of acetyl groups within cellulose acetates based on FT Raman spectroscopy. Cellulose acetates exhibiting diverse degrees of substitution ascribed to acetyl groups (DS Ac ) were obtained after the deacetylation of highly acetylated cellulose, i.e. cellulose diacetate and cellulose triacetate (CTA), with aqueous sodium hydroxide solution or 1,6-hexamethylenediamine (HMDA). After plotting the Raman intensity ratios between the bands at 1,740 and 1,380 cm -1 against the DS Ac , a calibration curve with high correlation coefficient of more than 0.99 was obtained. During the deacetylation of highly acetylated cellulose, a by-product-sodium acetate (NaOAc)-forms as the most possible salt among others. In order to determine the content of NaOAc, the mixtures of cellulose acetates and NaOAc were measured with FT Raman spectroscopy. Based on the relationship between the Raman intensity ratios as I 929 /I 1380 and the contents of NaOAc in the mixtures, a calibration curve exhibiting high correlation coefficient of more than 0.99 was generated.

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“…Bands observed in the region between 1500 and 1300 cm -1 comprise the vibration modes of cellulose backbone of CA polymer. This region is essentially described by deformation modes of CH 2 , H-C-C, H-C-O and C-O-H vibrations at 1378 cm -1 and by the deformation of CH 3 groups within acetyl groups [17,19] at 1434 cm -1 . A discrete band at 1485 cm -1 is also observed with the increase in GPTMS content in the hybrid films and is assigned to CH 2 scissoring and CH rocking in epoxy ring [15].…”

Section: Resultsmentioning

confidence: 99%

Multifunctional organic–inorganic hybrids based on cellulose acetate and 3-glycidoxypropyltrimethoxysilane

Silva

Salvi

Santos

et al. 2016

J Sol-Gel Sci Technol

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Organic-inorganic hybrid films have been prepared from cellulose acetate (CA) and 3-glycidoxypropyltrimethoxysilane (GPTMS). Flexible films were fashioned with high relative content of GPTMS (up to 70 wt%) and exhibited high transparency in the visible/near-infrared region. The atomic force microscopy images of hybrid films display the presence of nanometric globular-like domains with size dependent and number dependent of the content of GPTMS. X-ray diffraction (XRD) patterns showed decreasing crystallinity of CA hybrid counterpart with increasing amounts of GPTMS. Spectroscopy results (vibrational spectroscopy FTIR and Raman scattering, 13 C and 29 Si NMR spectra) suggest that epoxy groups mostly remain intact and significant amount of methoxysilane groups is available after addition of GPTMS in CA. From 29 Si NMR results, all compositions showed the presence of non-hydrolized GPTMS molecules or having mono-and disubstituted siloxane bonds. For highest relative content of GPTMS (i.e., 50 wt%), a considerably high amount of nonhydrolized (T 0) is observed. Moreover, the addition of GPTMS leads to an increase in the thermal stability as compared to pure CA. Luminescent films were obtained by incorporating luminescent [Eu(TTA) 3 (H 2 O) 2 ] complex (TTA = thenoyltrifluoroacetonate) into the hybrid films. Spectroscopic parameters did not significantly change with the incorporation of luminescent complex, suggesting application in photonics. The 5 D 0 states quantum efficiency was observed to be the same for the neat complex and the luminescent hybrid film, suggesting a weak interaction with the host.

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Raman spectra and physical structure of cellulose triacetate

Cited by 17 publications

References 6 publications

Dynamical study of the water penetration process into a cellulose acetate film studied by coherent anti-Stokes Raman scattering (CARS) microspectroscopy

Dynamical study of the water penetration process into a cellulose acetate film studied by coherent anti-Stokes Raman scattering (CARS) microspectroscopy

FT Raman spectroscopic investigation of cellulose acetate

Multifunctional organic–inorganic hybrids based on cellulose acetate and 3-glycidoxypropyltrimethoxysilane

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