The present work concerns on the synthesis of silver nanoparticles at 25 ºC using raw fruits extract of Bakul (Mimusops elengi) tree via
chemical reduction route development of poly(vinyl alcohol) PVA-silver polymer nanocomposite films. The nanocomposite films were
subjected to characterization by UV-visible, FTIR, X-ray diffraction, field emission scanning electron microscope (FESEM) and thermal
studies. The UV-visible spectrum shows a characteristic broad absorption band observed near 465 nm suggesting presence of silver
nanoparticles in polymer nanocomposites (PNCs) film. The vibrational band shift of –OH group of poly(vinyl alcohol) in the presence of
nanoparticle designated the chemical interaction between –OH group of poly(vinyl alcohol) and silver nanoparticles. The FESEM study
confirmed that PVA is not only acted as a capping agent, but also a cross-linking agent. X-ray diffraction study shows that the existence
of AgNPs in the poly nanocomposite film and nanoaparticles are crystalline in nature. Thermal studies suggest that the enhanced thermal
stability is because of the good packing of the polar crystallites in β-PVA composites as compared to the non-polar α-phase of neat
poly(vinyl alcohol) (PVA).
Conjugated cyano cyclo‐olefins modified as highly regioselective dipolarophiles in 1,3‐dipolar cycloaddition with NaN3 to synthesize corresponding fused 1,2,3‐triazole and 1H‐tetrazole derivatives. The first example of catalytic 1,3‐dipolar cycloaddition of NaN3 with 2H‐chromene‐3‐carbonitriles and subsequent elimination/cyclization of cyano functionality is designated. In presence of catalytic amount of p‐TSA or AgNO3, 2H‐chromene‐3‐carbonitriles react with NaN3 discretely producing 2,4‐dihydrochromeno[3,4‐d][1,2,3]triazoles or 5‐(2H‐chromen‐3‐yl)‐1H‐tetrazoles respectively, in good to excellent yields (i. e. 51–88 % or 85–97 %) with high regioselectivity and wide substrate scope adequacy.
Herein, a development of cuprous oxide (Cu2O)/polyvinylidene difluoride (PVDF) polymer
nanocomposite (PNC) films by solution casting route is reported. The nanocomposite films were characterized using UV-visible spectroscopy, Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), thermogravimetric analysis (TGA) and LCR meter. Formation of a broad band near 465 nm for polymer nanocomposite suggests that Cu2O nanoparticles are present in the film. Some of the vibrational bands of PVDF were slightly shifted from their original position and the intensity of some bands were found to increase in presence of nanoparticles. Such features reveal that some interaction occurs between PVDF and Cu2O nanoparticles. Scanning electron microscope (SEM)
images show that the nanoparticles are interconnected to each other through PVDF polymer chain. Crystalline nature of Cu2O nanoparticles in the film was confirmed from XRD pattern. Thermogravimetric analysis shows that thermal stability of neat PVDF has increased in presence of nanoparticles. The neat PVDF showed dielectric constant value of 8 at frequency 100 Hz, while that of 1 wt% Cu2O doped PVDF polymer nanocomposite has exhibited dielectric constant value ~175 at the same frequency.
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