Surface Properties of a Novel Poly(vinyl alcohol) Film Prepared by Heterogeneous Saponification of Poly(vinyl acetate) Film

Abstract

Almost general poly(vinyl alcohol) (PVA) films were prepared by the processing of a PVA solution. For the first time, a novel poly(vinyl alcohol) (PVA) film was prepared by the saponification of a poly(vinyl acetate) (PVAc) film in a heterogenous medium. Under the same saponification conditions, the influence of saponification time on the degree of saponification (DS) was studied for the preparation of the saponified PVA film, and it was found that the DS varied with time. Optical microscopy was used to confirm the characteristics and surface morphology of the saponified PVA film, revealing unusual black globules in the film structure. The contact angle of the films was measured to study the surface properties, and the results showed that the saponified PVA film had a higher contact angle than the general PVA film. To confirm the transformation of the PVAc film to the PVA film, 1 H nuclear magnetic resonance spectroscopy, X-ray diffraction measurements, differential scanning calorimetry, and Fourier-transform infrared spectroscopy were employed.

Unraveling the gallol-driven assembly mechanism of thermoreversible supramolecular hydrogels inspired by ascidians

“…PVA with a degree of hydrolysis ≥99.0% and M w 85 000 was synthesized by alcoholysis of the partially hydrolyzed PVA following a method reported in the literature. 45 Deionized water was used for all experiments.…”

Optical, thermal, mechanical properties, and non‐isothermal degradation kinetic studies on PVA/CuO nanocomposites

“…The solution was dried at 40°C in a vacuum oven to fabricate bubble free PVA‐CuO nanocomposite film. The reports on the preparation of PVA film and PVA/graphene oxide nanocomposites under vacuum condition were available in the literature . Then, the dried films were peeled off from the petri dish for further analysis.…”

Dielectric Elastomers UV-Cured from Poly(dimethylsiloxane) Solution in Vinyl Acetate

“…We could not obviously find the absorption peak at 3200–3400 cm −1 designated to the OH stretching vibration that was expected from the converted PVA. However, we know that the peak in a heterogeneously saponified PVAc film is much less noticeable than that in a PVA film [ 30 ]. Therefore, the expected absorption peak in our saponified film may not markedly appear in the IR spectrum acquired especially from the ATR technique.…”