Effect of dopant mixture on structural, optical and electron spin resonance properties of polyvinyl alcohol

Abdelaziz, M.; Abdelrazek, E.M.

doi:10.1016/j.physb.2006.07.067

Cited by 119 publications

(45 citation statements)

References 32 publications

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“…It may be said that the structural changes take place after doping with iodine chloride as a result of complex formation of iodine with carbonyl group of PVA/PVP, with different models depending on the doping level. Thus it may be concluded that structural changes in after doping PVA/PVP are responsible for changing the refractive index of PVA/PVP [17]. From Fig.…”

Section: Resultsmentioning

confidence: 85%

Spectroscopic and dielectric study of iodine chloride doped PVA/PVP blend

Abdelrazek

Ragab

2014

Indian J Phys

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Optical and dielectric properties of Poly (vinyl alcohol)/ Poly (vinyl pyrrolidone) blend and blend loaded with different concentrations of ICl 2 were studied. UV-Vis spectral analysis before and after c-irradiation suggested that the addition of iodine led to complete complexation between ICl 2 and polymer blend were observed. The values of optical parameters k o , S o and n ? were determined from by reflection and transmission spectra in the range of 200-800 nm. The refractive index was found to change non-monotonically with the increase of iodine. Infrared analysis revealed the formation of new species between blend and iodine content. There were some changes in IR absorption bands, position and their intensities. The AC conductivity (r ac ) behavior of all prepared films was investigated in the frequency range 42 Hz-5 MHz and under different isothermal stabilization in the temperature range 300-400 K. The dependence of the imaginary modulus (M 00 ) on frequency at lower frequencies was estimated. The increasing values of M 00 may be attributed to the bulk effect with the increase in temperature.

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Section: Resultsmentioning

confidence: 85%

Spectroscopic and dielectric study of iodine chloride doped PVA/PVP blend

Abdelrazek

Ragab

2014

Indian J Phys

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“…Consequently, PVA/PEO polymer blend is considered as an optically transparent in the visible region. The spectrum of blend sample exhibited a hump at 290 nm, which is assigned to the existence of carbonyl-groups associated with ethylene unsaturation of the type -(CH=CH) 2 CO-, and is indicative of the presence of conjugated double bonds [30]. The spectra of solid polymer electrolyte films have an additional band at 668, 845, 869, 872 nm, for 2, 4, 6 and 8 wt% CuCl 2 contain, respectively.…”

Section: −mentioning

confidence: 95%

Complexion Formation in PVA/PEO/CuCl<sub>2</sub> Solid Polymer Electrolyte

Abdullah¹,

Saber²,

Hamasalih³

2015

ujms

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Solid polymer electrolyte films based on polymer blends of poly(vinyl alcohol) (PVA) and poly(ethylene oxide) (PEO), with different concentration of copper (II) chloride (CuCl 2 ) were prepared using casting technique. Optical studies were performed using Fourier transform infrared (FT-IR) and Ultraviolet-visible (UV-Vis) spectroscopy. The optical properties of these films were varied by varying CuCl 2 concentration. The results show the absorption edge for electrolyte samples shifts toward a lower energy region by increasing the salt concentration, leading to the band gap reduction. The band gap energy data showed that the incorporation of CuCl 2 into the polymeric system causes charge transfer complexes in the blend polymer, which lead to increase in the electrical conductivity, by providing additional charges in the lattice. The PVA/PEO/CuCl 2 solid polymer electrolyte films exhibit good UV shielding properties in the wavelength range from 190 to 400 nm.

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“…The band corresponding to asymmetric stretching vibrations of the methylene group occurs at approximately 2933 cm −1 . The band at approximately 1096 cm −1 corresponds to C-O stretching in the acetyl groups present on the PVA backbone [18]. Notably, the bands of CH are assigned to the saccharide structure at 1166 cm −1 , 1077 cm −1 , and 1018 cm −1 .…”

Section: Sem Analysismentioning

confidence: 98%

Fabrication and Testing of PVA/Chitosan Bilayer Films for Strawberry Packaging

et al. 2017

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Strawberry packaging based on four different chitosan-poly(vinylalcohol) blend films with chitosan contents of 0 wt %, 20 wt %, 25 wt %, and 30 wt % was tested. The samples were stored at 18 ± 2 • C and 60% ± 5% relative humidity for six days. Strawberry quality was evaluated during and after storage. Strawberries packaged using these films showed significant differences in weight loss and firmness, decay percentage, titratable acidity, total soluble solids, and ascorbic acid content when compared to non-packaged strawberries. The 25 wt % bilayer film showed the best performance in terms of delaying changes in strawberries. The findings suggest that these 25 wt % chitosan films can used to extend strawberry shelf lives while maintaining quality levels.

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Effect of dopant mixture on structural, optical and electron spin resonance properties of polyvinyl alcohol

Cited by 119 publications

References 32 publications

Spectroscopic and dielectric study of iodine chloride doped PVA/PVP blend

Spectroscopic and dielectric study of iodine chloride doped PVA/PVP blend

Complexion Formation in PVA/PEO/CuCl<sub>2</sub> Solid Polymer Electrolyte

Fabrication and Testing of PVA/Chitosan Bilayer Films for Strawberry Packaging

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