Fumed SiO₂ nanoparticle reinforced biopolymer blend nanocomposites with high dielectric constant and low dielectric loss for flexible organic electronics

Abstract

In the present study, fumed silica (SiO2) nanoparticle reinforced poly(vinyl alcohol) (PVA) and poly(vinylpyrrolidone) (PVP) blend nanocomposite films were prepared via a simple solution‐blending technique. Fourier transform infrared spectroscopy (FTIR), ultraviolet–visible spectroscopy (UV–vis), X‐ray diffraction (XRD), and scanning electron microscopy (SEM) were employed to elucidate the successful incorporation of SiO2 nanoparticles in the PVA/PVP blend matrix. A thermogravimetric analyzer was used to evaluate the thermal stability of the nanocomposites. The dielectric properties such as dielectric constant (ɛ) and dielectric loss (tan δ) of the PVA/PVP/SiO2 nanocomposite films were evaluated in the broadband frequency range of 10−2 Hz to 20 MHz and for temperatures in the range 40–150 °C. The FTIR and UV–vis spectroscopy results implied the presence of hydrogen bonding interaction between SiO2 and the PVA/PVP blend matrix. The XRD and SEM results revealed that SiO2 nanoparticles were uniformly dispersed in the PVA/PVP blend matrix. The dielectric property analysis revealed that the dielectric constant values of the nanocomposites are higher than those of PVA/PVP blends. The maximum dielectric constant and the dielectric loss were 125 (10−2 Hz, 150 °C) and 1.1 (10−2 Hz, 70 °C), respectively, for PVA/PVP/SiO2 nanocomposites with 25 wt % SiO2 content. These results enable the preparation of dielectric nanocomposites using a facile solution‐casting method that exhibit the desirable dielectric performance for flexible organic electronics. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44427.

Structural, morphological, thermal, dielectric, and electrical properties of alumina nanoparticles filled PVA–PVP blend matrix‐based polymer nanocomposites

“…a) confirms its smooth, homogeneous and tightly packed structure which ensures high miscibility of PVA and PVP in the blend. The SEM images of the pristine PVA–PVP blend is found consistent with the earlier studies on 50/50 wt% PVA–PVP blend film . It can be seen from Fig.…”

“…The FTIR spectra of the pristine PVA–PVP blend film ( x = 0) exhibits all the characteristic vibrational stretching bands of the pristine PVA and the PVP films but these bands positions in the blend have some shift confirming the high compatibility of the polymers due to formation of C  O···HO hydrogen bonding between the hydroxyl (OH) groups of PVA and the carbonyl (C  O) functional groups of PVP . Further, the FTIR spectrum of PVA–PVP blend film (50/50 wt%) is found in agreement with the earlier results . In this spectrum, the broadband centered at about 3,291 cm −1 attributed to the –OH stretching vibration of PVA, whereas a low‐intensity band centered around 2,918 cm −1 denotes the CH asymmetric stretching vibration mode of these polymer molecules.…”

“…Characterization of frequency and temperature dependent dielectric and electrical properties of the polymer nanocomposite (PNC) materials has been one of the intense areas of research in the advances of materials science and engineering . These PNC materials are broadly used as flexible nanodielectric substrate and an electrical insulator for the organic thin film transistors , transient electronic antennas , packaging for electronic devices , electromagnetic pollution and interference shielding , as a base matrix for the preparation of optoelectronic devices , sensors , and solid‐state energy storage and conversion devices . In addition to the technological applications, the understanding of fundamental phenomena occurring at nano‐scale level in the nanoparticles dispersed flexible polymeric matrices has significant academic interest .…”

“…The hydroxyl (OH) and carbonyl (C  O) functional groups of the PVA and PVP backbone, respectively, exhibit electrostatic interactions with the additives and inorganic nanofillers, and therefore, these hydrophilic polymers are mostly preferred as binders and capping agents in the preparation of advanced composite functional materials . In addition to the pristine polymers, the blend of PVA and PVP realizes its giant applications in the area of electronics, electrical, and biomedical engineering and also in the preparations of various kind of sensors and the energy storing devices .…”

Improvement in mechanical properties of polyurethane‐urea nanocomposites by using modified SiO2 nanoparticles

“…On the other hand, using additives in polymer matrix seems to be a facile method resulting polymer with fine properties. Nanoparticles have been interested as additive in polymer matrix showing unique properties due to their surface to volume ratio in many researching areas like catalysts, electronics, paints, medicine, and so on. Mixing these two categories of materials, that is, polymers and nanoparticles has been led to produce polymeric nanocomposites as an attractive field with applicable yields.…”