Abstract
In this paper, poly(vinyl alcohol)/silver nitrate (PVA/AgNO3) films were annealed at 180 °C for 1 h to prepare highly electrically conductive poly(vinyl alcohol)/silver (PVA/Ag) nanohybrids. Ultraviolet (UV)-visible absorption spectra, X-ray diffraction (XRD) scans, and scanning electronic microscopy (SEM) were applied to investigate the structures and morphology of the PVA hybrids. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) were employed to study the thermal property of PVA/AgNO3 films. Furthermore, perturbation-correlation moving-window two-dimensional (PCMW2D) correlation spectroscopy combined with temperature-dependent Fourier transform infrared (FTIR) spectroscopy was used to investigate the conversion of AgNO3 into Ag nanoparticles in PVA matrix. The results show that the chelates for AgNO3 coordinated with hydroxyl groups are primarily decomposed in the temperature regions of 39.7–72.6 °C and 182.7–199.6 °C. AgNO3 is reduced into Ag0 and the hydroxyl groups of PVA are oxidized into carbonyl groups. The PVA-AgNO3 chelates are very rapidly decomposed in the temperature region of 182.7–199.6 °C. Large amounts of Ag0 produced by the reduction of AgNO3 are aggregated into Ag nanoparticles which are homogeneously dispersed into the PVA matrix. When the temperature increases to 212.7 °C, the unhydrolyzed acetate groups in PVA chains are sharply decomposed.
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Xue, B., Zhang, J., Ji, L. et al. Perturbation-correlation moving-window two-dimensional correlation spectroscopic studies on the heat treatment of poly(vinyl alcohol)/silver nitrate film. J Polym Res 23, 252 (2016). https://doi.org/10.1007/s10965-016-1149-4
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DOI: https://doi.org/10.1007/s10965-016-1149-4