Effect of CsBr-MnCl2 mixed fillers on the crystal structure and optical and electrical properties of poly(vinyl alcohol)

2004 ◽  
Vol 94 (5) ◽  
pp. 2178-2186 ◽  
Author(s):  
M. Abdelaziz
Keyword(s):  
Crystal Structure ◽  
Electrical Properties ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Optical And Electrical Properties

scholarly journals Effect of a Polymeric Protective Coating on Optical and Electrical Properties of Poly(p-phenylene vinylene) Derivatives

2013 ◽  
Vol 2013 ◽  
pp. 1-5
Author(s):  
V. C. Gonçalves ◽  
C. A. Olivati ◽  
A. J. F. Carvalho ◽  
D. T. Balogh
Keyword(s):  
Electrical Properties ◽  
Protective Coating ◽  
Vinyl Alcohol ◽  
Light Exposure ◽  
Emission Spectra ◽  
Phenylene Vinylene ◽  
Poly Vinyl Alcohol ◽  
Optical And Electrical Properties ◽  
Luminescent Polymer

The resistance to photodegradation of poly[(2-methoxy-5-n-hexyloxy)-p-phenylene vinylene] (OC1OC6-PPV) films was significantly enhanced by the use of poly(vinyl alcohol) 99% hydrolyzed as protective coating. The deposition of poly(vinyl alcohol) onto OC1OC6-PPV films did not affect the absorption and the emission spectra of the luminescent polymer. The protected film showed 5% drop on the absorbance at 500 nm after 270 hours of light exposure while the unprotected film completely degraded in the same conditions. The conductivity of the protected film remained stable (around7×10−10 S/m) while the value for the unprotected one dropped around two orders of magnitude after 100 hours of light exposure.

scholarly journals Morphological and Thermal Properties of Poly(Vinyl Alcohol)/Layered Double Hydroxide Hybrid Nanocomposite Fibers

2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
A. F. Al Naim ◽  
J. Mazher ◽  
S. S. Ibrahim
Keyword(s):  
Crystal Structure ◽  
Heat Treatment ◽  
Layered Double Hydroxide ◽  
Vinyl Alcohol ◽  
Separation Distance ◽  
Molecular Vibration ◽  
Poly Vinyl Alcohol ◽  
Rapid Weight Loss ◽  
Different Temperatures ◽  
Double Hydroxide

Nanolayered particulate of Zn-based layered double hydroxide (LDH) was prepared by a low temperature greener sol-gel method. X-ray diffraction (XRD) studies were performed on the particles annealed at different temperatures. Hexagonal crystal structure of the as-grown LDH particulates was observed. The crystal structure was modified to tetragonal structure of layered double oxide (LDO) on annealing at 250°C. Rietveld fittings showed a collapse of interlayer separation distance along the preferred orientation of the LDH particles as a result of heat treatment. Further, LDH particles were used as fillers of electrospun poly(vinyl alcohol) (PVA) fibers. Heat treatment of the polymer fibers was also performed at different temperatures, and thermal changes were studied by thermogravimetric analysis (TGA), Raman spectroscopy, and scanning electron microscopy (SEM) techniques. Improved interaction of fibers with LDH nanoparticles was observed and ascribed to LDH-related LDO phase transformation at higher temperature. Thermal mechanisms of the rapid weight loss in filled fibers were discussed in comparison to the pure PVA fiber losses. Experimental Raman frequencies of the composite fibers were compared with the calculated Raman modes of the enol and ZnO monomers. The molecular vibration frequencies were found to differ significantly due to heat treatment. Finally, the role filler in the faster and greener thermal decomposition of polymeric fibers was also discussed in the present work.

scholarly journals Crystal structure, phase transitions, optical and electrical properties in a new Cu-halide organic-inorganic hybrid

2019 ◽  
Vol 1186 ◽  
pp. 118-126 ◽  
Author(s):  
Ines Ben Hadj Sadok ◽  
Fadhel Hajlaoui ◽  
Karim Karoui ◽  
Nathalie Audebrand ◽  
Thierry Roisnel ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Phase Transitions ◽  
Electrical Properties ◽  
Optical And Electrical Properties ◽  
Inorganic Hybrid ◽  
Structure Phase
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