Untitled

SynopsisThe infrared and ultraviolet spectra of poly( vinyl alcohol) (PVA) treated with ferric chloride and zinc chloride were recorded. Careful examination of the infrared spectra revealed that these treatments cause significant changes in the crystallinity of PVA, particularly in the case of the treatment with ZnClz. The results showed that exposure of untreated and FeCl,-treated PVA to 12 or 28 Mrads results in no observable changes in their ultraviolet and infrared spectral features, whereas exposure of ZnC1,-treated PVA at the same dosages, results in the appearance of an absorption band at 1595 cm-' corresponding to &diketone groups. It was also found that y-irradiation of ZnCl,-treated PVA produces a remarkable change in its crystallinity. Moreover, the effect of heat on the spectral features of the ZnC12-treated PVA was discussed. It was found that the treatment of PVA with ZnClt helps in oxidative degradation of PVA.

mentioning

confidence: 99%

Effect of γ‐irradiation and temperature on the structure of metal chloride‐treated poly(vinyl alcohol)

Rabie

Abdel-Hakeem

Moharram

1989

Effect of γ‐irradiation and temperature on the structure of metal‐chloride‐treated poly(vinyl alcohol)

Rabie¹,

Abdel-Hakeem²,

Moharram³

1990

SynopsisThe infrared and ultraviolet spectra of poly(viny1 alcohol) (PVA) treated with ferric chloride and zinc chloride were recorded. Careful examination of the infrared spectra revealed that these treatments cause significant changes in the crystallinity of PVA, particularly in the case of the treatment with ZnC1,. The results showed that exposure of untreated and FeC1,-treated PVA to 12 or 28 m a d s results in no observable changes in their ultraviolet and infrared spectral features, whereas exposure of ZnC1,-treated PVA at the same dosages, results in the appearance of an absorption band at 1595 cm-' corresponding to P-diketone groups. It was also found that y-irradiation of ZnC1,-treated PVA produces a remarkable change in its crystallinity. Moreover, the effect of heat on the spectral features of the ZnC1,-treated PVA was discussed. I t was found that the treatment of PVA with ZnC1, helps in oxidative degradation of PVA.

Spectroscopic studies on the effect of doping with iodine on metal chloride‐treated poly(vinyl alcohol)

Moharram¹,

Rabie²,

El-Hamouly³

1991

SYNOPSISThe ultraviolet and infrared spectra of films of PVA treated with Co ( 11 ) , Ni ( 11 ) , and Cu ( 11 ) and then doped with iodine were studied. The spectra of the films preheated in air at temperatures from 25 to 180°C for 2 h were investigated. The obtained data revealed that treatment of PVA with different concentrations of each of the mentioned metal salts causes profound spectral changes. The analysis of UV spectra showed that the intensity of the band at 280 nm decreases with increasing metal concentration. It was also found that doping with iodine results in an appearance of an additional peak at about 360 nm. Careful examination of the infrared spectra indicated that the crystallinity of the samples depends on the concentration of metals and is affected by temperature treatment.