Polyene Formation Catalyzed by Phosphotungstic Acid and Aluminum Chloride in Thin Films of Poly(Vinyl Alcohol)

Третинников, О. Н.; Sushko, N. I.; Maly, Alina

doi:10.1007/s10812-016-0206-4

Cited by 2 publications

(1 citation statement)

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“…In particular, the Keggin-type HPAs have been widely investigated as the catalysts for the dehydration of alcohols of low molecular weight (ethanol, isopropanol, glycerol) [23][24][25][26]. However, HPA-catalyzed dehydration of alcohols with a large number of hydroxyl groups, in particular the dehydration of PVA, to the best of our knowledge, has not been reported in the literature, except our communication [27]. Therefore, at first, we present the results of a comparative study of the polyenes formation resulting from the TPA and HCl catalyzed dehydration of PVA in PVA films of various thicknesses containing these catalysts.…”

Section: Resultsmentioning

confidence: 90%

Fabrication and optical properties of dichroic polarizing films based on poly(vinyl alcohol)-heteropolyacid nanocomposites

Третинников

Sushko

2019

Appl. Phys. A

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We report on a new type of poly(vinyl alcohol)(PVA)-based dichroic polarizing films whose visible dichroism is due to long-chain linear polyenes, -(CH=CH) n -, formed in the course of acid-catalyzed thermal dehydration of the polymer. The distinguishing feature of these films is that the solid acid catalyst (12-tungstophosphoric acid, TPA) is used instead of the liquid ones. Thin PVA films with embedded TPA nanoparticles were fabricated by solution casting technique. Subsequent stretching and annealing of these PVA/TPA nanocomposites produced PVA-polyene/TPA dichroic polarizing films with the thickness below 10 µm. Transmission electron microscopy, Fourier-transform infrared spectroscopy, and UV-Vis spectroscopy techniques were used to characterize the films at various stages of preparation. The fabricated polarizing films showed polarization efficiency exceeding 94% and transmittance higher than 40% in the visible range. The polarizing properties of the films did not deteriorate upon prolonged exposures to hot humid air (60 °C, 90% RH) and high temperature (90 °C). The nanocomposite polarizing film proposed in this study may have application potential in thin and flexible optoelectronic devices that must operate under harsh environmental conditions.

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