Optical studies of pure and gelatin-doped poly(vinyl alcohol) films irradiated with fast neutrons

Abstract

ABSTRACT:The ultraviolet (UV) and infrared (IR) spectra of pure poly(vinyl alcohol) (PVA) and gelatin-doped PVA films with concentrations (2, 5, 7, 10, and 15 wt %) were studied before and after irradiation with neutron fluences in the range of 10 5 -10 8 n/cm 2 . The obtained data revealed that the addition of gelatin and neutron irradiation causes structural variation in the PVA network. The analysis of the UV spectra showed that the increase of dopant concentration above 5 wt % gelatin makes the sample less resistant to a degradation effect caused by neutron irradiation. It was also found that the intensity of the band at 210 nm increases by increasing dopant concentration. Careful examination of the infrared spectra indicated that the induced percent crystallinity of the sample containing 5 wt % gelatin has more stability than the other doped samples. Neutron irradiation also results in the appearance of new absorption bands and irregular change in the absorbance of some IR bands.

Thermal and optical properties of gelatin/poly(vinyl alcohol) blends

“…The spectrum of pure gelatin film had an intense band at about 210 nm, which may have been due to the presence of chromophoric groups. This result is in good agreement with that previously reported 23–28. In addition, the spectrum of pure PVA exhibited three absorption bands.…”

Preparation and Characterization of Polyvinyl Alcohol Thin Films for Organic Thin Film Transistors and Biomedical Applications

“…The infrared spectrum of PVA thin film is shown in the figures 1. The spectrum of PVA film is found to be consistent with the previous reports in literatures for PVA film (6,7,8).…”

Thermal and Spectroscopic Studies of Polyvinyl Alcohol/Sodium Carboxy Methyl Cellulose Blends.

“…Figure 4shows the Infrared spectrum and assignment of the most evident absorption bands for pure PVA thin films between 500 and 4000 cm -1 . The spectrum seems to be consistent with that previously reported in literature [18][19][20][21][22] except the appearance of absorbed ν δ (HOH) bending band [23]at 1660 cm -1 . Water is probably present since vacuum drying is not used.…”