Enhancement in thermal, mechanical and electrical properties of novel PVA nanocomposite embedded with SrO nanofillers and the analysis of its thermal degradation behavior by nonisothermal approach

Abstract

Effect of SrO nanofillers on the physical and chemical properties of newly prepared PVA nanocomposites was investigated in‐depth in this article. The structure of SrO nanopowder and PVA nanocomposites were analyzed using FTIR for surface chemistry and XRD for crystallographic nature. The extent of dispersion and particle size of SrO nanopowders were obtained from TEM micrographs. The average particle size of the SrO nanopowder was 57 nm. The uniformly dispersed SrO nanofillers in the host PVA matrix were observed from the TEM micrographs. The prepared PVA nanocomposites displayed a high absorption in the UV region. The thermal stability of PVA nanocomposites was enhanced after the addition of SrO nanofillers. The nonisothermal degradation study was carried out using different kinetic models for the prepared PVA nanocomposites. The Young's modulus (Y) and tensile strength of the PVA nanocomposites were higher than that of the pristine PVA. The DC conductivity of PVA was also increased when the PVA was embedded with the SrO nanoparticles. Highlights The novel PVA nanocomposites embedded with SrO nanofillers were prepared by the solution casting method. The band gap of PVA was decreased gradually while increasing the concentration of SrO nanofillers. The thermal degradation of polymer composites was studied under nonisothermal heating using several kinetic models. The thermal stability of PVA was enhanced after the addition of SrO nanofillers. The electrical and mechanical Properties of PVA nanocomposites were also improved.

Suppression of Oxygen Vacancies in Rutile Ruo2 via In Situ Exsolution for Enhanced Water Electrocatalysis

“…The SAED pattern for particle 1 in Figure 4a can be assigned to ($$0\bar{1}1$$), ($$\bar{1}10$$), and ($$\bar{1}01$$) planes of tetragonal RuO 2 (the Joint Committee on Powder Diffraction Standards (JCPDS) # 00‐040‐1290) (Figure 4b), [ 50 ] while the electron diffraction rings recorded from the adjacent particles can be assigned to cubic SrO phase (JCPDS # 00‐006‐0520) (Figure 4c). [ 51 ] TEM image on a selected rod clearly indicates the existence of a thin SrO layer on the {110} planes of RuO 2 (Figure 4d). The configuration of RuO 2 coated by SrO is also verified by the EDS elemental maps (Figure 4e,f and Figure S12, Supporting Information).…”

“…Figure 4h shows the HRTEM images of RuO 2 [ 50 ] on the bottom and the cubic SrO phase on the top‐right part of the picture. [ 51 ] Interestingly, we occasionally observed the in situ exsolution process during the electron beam illumination. A crystallite was newly formed between RuO 2 and SrO phases as exhibited in Figure 4i.…”

Remarkable tailoring of thermal and dielectric properties of poly(vinyl alcohol) nanocomposite via hydrothermal grown ZnAl layer di hydroxide nanostructures and graphene fillers

“…The second stage of degradation origination from 200 C is may be related to the complete carbonization and condensation of water molecules of the PVA sample. 46 In case of nanocomposites, the first transition were observed near 180 C which may be caused by the dehydration of the LDH interlayer whereas the second major transition occurs at 250 C in the nanocomposites, which can be attributed to decomposition of polymeric chains and anionic species present at the interlayer of LDH nanosheets. 47 Above 500 C, the mixed metal oxides were formed by the decomposition of LDH and total loss of polymer takes place.…”

Strontium Oxide Nanoparticles for Biodiesel Production: Fundamental Insights and Recent Progress

“…An effective and simple method to obtain metal oxide NPs is the route of chemical oxidation. In this method, Sr salt, usually SrCl 2 , is dissolved in a strongly basic solution (achieved by the addition of NaOH up to a pH value of 12). , Hydrothermal synthesis is another method usually employed that combines pressure as a driving force for the forward reaction. In this method, a Sr salt, for example, Sr­(OH) 2 , is reacted with a strong reducing agent in a strongly basic solution.…”