Effect of Microwave Irradiation on Polyvinyl Alcohol as a Carrier of Silver Nanoparticles in Short Exposure Time

Abstract

Microwave heating of Ag+ in polyvinyl alcohol (PVA) is an effective method to synthesize silver nanoparticles (AgNPs), a broad-range antibacterial agent. However, the microwave may cause PVA solution to dry out and degrade. This study is aimed at investigating the effect of microwave irradiation on different concentrations of PVA in PVA/Ag+ solution in short periods of exposure. Fourier-transform infrared (FTIR) spectroscopy was employed to evaluate chemical changes of samples with different exposure times and PVA concentration. The results confirm the redox reaction of Ag+ with PVA. In addition, Ag+ reduces the rate of hydrolysis of PVA, and the ether bridges are limited by the spatial structure.

Application of Coating Chitosan Derivatives (N,O–Carboxymethyl Chitosan/Chitosan Oligomer Saccharide) in Combination with Polyvinyl Alcohol Solutions to Preserve Fresh Ngoc Linh Ginseng Quality

“…In addition, the PVA solution had peaks at around 3250 cm −1 due to the stretching vibration of the -OH groups; 2900 cm −1 , Furthermore, the FTIR spectra of the blend solutions (COS-PVA and NOCC-PVA) were compared to those of their individual components, illustrating the interactions between their chemical functional groups in Figure 2B,C. In addition, the PVA solution had peaks at around 3250 cm −1 due to the stretching vibration of the -OH groups; 2900 cm −1 , representing the C-H stretching vibration of the CH2 groups; 1650 cm −1 , associated with the stretching vibration of the carbonyl groups (C=O); and 1400 cm −1 , corresponding to the bending vibration of the CH2 groups [51,52]. Compared to the PVA solution and only chitosan-derived solutions, both the NOCC-PVA and COS-PVA solutions showed a significant decrease in intensity at peaks of around 3250 cm -1 and a slight reduction in wavenumber to 1570 cm −1 and 1600 cm −1 , respectively.…”

Microwave-Assisted Oxidative Degradation of Poly(vinylidene fluoride-co-hexafluoropropylene) Copolymers: Preparation, Characterization, and Reaction Mechanism

“…such as the use of microwaves for the degradation of lignin, 32 starch, 33 and poly(vinyl alcohol). 34 The generation of free radicals along the polymer chains is facilitated by radiation, resulting in the formation of oxidative products, such as alcohols, esters, and hydrogen peroxide, in the presence of oxidants. In the absence of oxidants, it elicits the generation of isolated and conjugated C�C unsaturated moieties inside the primary polymer chains.…”

“…MW radiation has gained significant interest in assisted organic synthesis processes due to its unique volumetric heating mechanism, − particularly in polymer material degradation. such as the use of microwaves for the degradation of lignin, starch, and poly(vinyl alcohol) . The generation of free radicals along the polymer chains is facilitated by radiation, resulting in the formation of oxidative products, such as alcohols, esters, and hydrogen peroxide, in the presence of oxidants.…”

“…Nonetheless, the most recent research on radiation-induced rubber degradation concentrates on how it affects material performance. Recent research on radiation-induced rubber degradation mainly focuses on its impact on material performance. − However, comprehensive investigations on the MW-assisted oxidative degradation of fluoroelastomers and their degradation processes are lacking. Our research team has been extensively studied the mechanisms of degradation of LTCFs made with CH-assisted oxidative degradation.…”

Bioreduction and Characterization of Silver Nanoparticles From Oil Palm Empty Fruit Bunch

“…Meanwhile, there are many reducing agents which used to reduce Ag + to Ag 0 ions on silver nitrate and silver chloride precursors such as NaOH [16], ammonia [17], sodium citrate and NaCl [18], and polyvinyl alcohol [19]. However, it is hazardous and not environmentally friendly.…”