ATR-FTIR and UV-vis spectroscopy studies of microwave oven-generated oxygen plasma modification for PVA films

Document Type : Original Article

Authors

1 Physics department, Faculty of science, Tanta university

2 Physics department, Faculty of science, Tanta University

3 Physics Department, Faculty of science, Tanta University

Abstract

In this study, a microwave oven-based plasma generation process is disclosed that is both easy and low-cost. A Paschen-like curve is observed. Because of polyvinyl alcohol (PVA) polymer's excellent properties, it can be used in many fields, including food packaging and agriculture, after plasma treatment. A solution-casting approach was used to create pure polyvinyl alcohol (PVA) film. In the second regime, Oxygen plasma treatment was used to modify the PVA surface at a constant power of 1000W with different O2 flow rates and pressures. XRD, ATR-FTIR, and UV-vis spectra were used to examine the surface properties of the films. An X-ray study revealed that the pure PVA film is semicrystalline in nature. The transmission peaks of the treated plasma film are clearly intense at 15 sec, 26 mbar, and 6 L/min. At 26 mbar, a slight peak shift towards higher wavenumbers is observed, corresponding to the C-O stretching of acetyl groups. The highest transmittance, nearly 64 percent, is found in the UV region of the UV-vis spectra at the same optimised conditions as FTIR. As a result of these findings, PVA became a transparent material for greenhouses.

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