Structural properties and temperature dependence dielectric properties of PVA-Al $$_2\mathrm{O}_3$$ 2 O 3 composite thin films

More, Shital; Dhokne, Ragini; Moharil, S. V.

doi:10.1007/s00289-017-2069-0

Cited by 33 publications

(16 citation statements)

References 41 publications

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“…As shown in Figure 2 , the pure PVA is known to exhibit a semi-crystalline structure with an intense peak at 2θ angle of 19.6°, corresponding to 101 crystallographic plane of PVA. However, it is clearly observed that the peak intensity of pure PVA greatly reduces with the increase of BC content, which may be attributed to the decrease of PVA crystallinity resulting from the separation of polymer chains followed by reorganization of its structure [ 22 ]. It can be concluded that the addition of BC into PVA polymer matrix enlarged the amorphous region [ 25 ].…”

Section: Resultsmentioning

confidence: 99%

“…Hema et al [ 21 ] prepared and characterized an ASPE based on PVA-PVDF-SiO 2 whose ionic conductivity achieved 9.4 × 10 −4 S·cm −1 . More et al [ 22 ] reported PVA-Al 2 O 3 electrolyte membrane, which had an ionic conductivity of 3.2 × 10 −4 S·cm −1 as the weight ratio was 10:1 (PVA:Al 2 O 3 ), and the mechanical strength was also improved. The addition of ceramic particles into the polymer matrix succeeded in reducing the crystallinity of the PVA, increased the amorphous phases of PVA matrix, then somewhat improved the ionic conductivities.…”

Section: Introductionmentioning

confidence: 99%

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Preparation and Characterization of PVA Alkaline Solid Polymer Electrolyte with Addition of Bamboo Charcoal

et al. 2018

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Natural bamboo charcoal (BC) powder has been developed as a novel filler in order to further improve performances of the polyvinyl alcohol (PVA)-based alkaline solid polymer electrolyte (ASPE) by solution casting method. X-ray diffraction patterns of composite polymer electrolyte with BC revealed the decrease in the degree of crystallinity with increasing content of BC. Scanning electron microscopy images showed pores on a micrometer scale (average diameter about 2 μm) distributed inside and on the surface of the membranes, indicating a three-dimension network formed in the polymer framework. The ionic conductivity was measured by the alternating-current (AC) impedance method, and the highest conductivity value of 6.63 × 10−2 S·cm−1 was obtained with 16 wt % of BC content and mKOH:mPVA = 2:1.5 at 30 °C. The contents of BC and KOH could significantly influence the conductivity. The temperature dependence of the bulk electrical conductivity displayed a combination of Arrhenius nature, and the activation energy for the ion in polymer electrolyte has been calculated. The electrochemical stability window of the electrolyte membrane was over 1.6 V. The thermogravimetric analysis curves showed that the degradation temperatures of PVA-BC-KOH ASPE membranes shifted toward higher with adding BC. A simple nickel-hydrogen battery containing PVA-BC-KOH electrolyte membrane was assembled with a maximum discharge capacity of 193 mAh·g−1.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of PVA Alkaline Solid Polymer Electrolyte with Addition of Bamboo Charcoal

et al. 2018

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“…Historically, several procedures have been used for characterizing blends containing polymers. One of the analytical techniques most required for these purposes is the infrared spectroscopy [2,3,[12][13][14][15][16][17][18][19]44,[50][51][52][53], which is particularly useful to identify the kind of intermolecular interactions responsible for the miscibility between the components. A shifting in the wave number of the characteristic IR absorption bands associated to determined functional groups, can be attributed to intermolecular association [3,[14][15][16][17][50][51][52][53].…”

Section: Resultsmentioning

confidence: 99%

“…LMWCs are added as additives to improve the properties of the polymeric component [6,[30][31][32][33][34][35][36][37]. Consequently, polymer-LMWC blends with different practical applications have been reported: controlled drug devices [38][39][40][41][42], regenerative medicine [43], electronic devices [44], hemodialysis applications [45], etc. In addition, LMWCs have been used not only as blend components but also as blend compatibilizers [46][47][48][49].…”

Section: Introductionmentioning

confidence: 99%

Blends of Poly(vinyl Pyridine)s and Dihydric Phenols: Thermal and Infrared Spectroscopic Studies. Part V

Gatica¹,

Medina²,

Moraga³

et al. 2019

J. Chil. Chem. Soc.

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Binary blends with poly(4-vinyl pyridine) (P4VPy) 160,000 g/mol and poly(2-vinyl pyridine) (P2VPy) 159,000 g/mol as polymer components and 4,4´-thiodiphenol (TDP), 4,4´-methylendiphenol (MDP), 2,2´-biphenol (22BP) and 4,4´-biphenol (44BP) as low molecular weight compounds (LMWCs), were prepared. Miscibility between the components was analyzed by Fourier Transform Infrared Spectroscopy (FTIR) and Differential Scanning Calorimetry (DSC). Thermogravimetric Analysis (TGA) and Scanning Electron Microscopy (SEM) were also used as complementary techniques. Hydrogen bonding formation was detected by FTIR due to the increasing of the wave number corresponding to the deformation absorption of pyridine groups in P4VPy and P2VPy. A decreasing of melting points and fusion heats of the LMWCs is observed by DSC, which shows a lower crystallinity level as the blends are richer in the polymer component as a consequence of the intermolecular interaction. A plasticizing effect is also observed by DSC when P4VPy is blended with TDP and MDP; the higher steric hindrance prevents this effect when P2VPy is blended with 22BP and 44BP. Miscible blends were obtained with a moderate trend to a higher interaction degree in blends containing P4VPy. This report is the fifth part of a series of works including polymer-LMWC blends. Variables such as molecular weight increase in P4VPy and steric hindrance in P2VPy have been comparatively analyzed with blends previously reported.

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“…PVA/Ag nanocomposites were prepared and studied by Pandey et al to assess their optical and thermal properties. Furthermore, More et al studied the structural and dielectric properties of PVA/Al 2 O 3 composites. It was reported that the dielectric properties of PVA/Al 2 O 3 composite were improved with the temperature.…”

Section: Introductionmentioning

confidence: 99%

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

Selvi

Parthasarathy

Mahalakshmi³

et al. 2019

Polymer Composites

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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.

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Structural properties and temperature dependence dielectric properties of PVA-Al $$_2\mathrm{O}_3$$ 2 O 3 composite thin films

Cited by 33 publications

References 41 publications

Preparation and Characterization of PVA Alkaline Solid Polymer Electrolyte with Addition of Bamboo Charcoal

Preparation and Characterization of PVA Alkaline Solid Polymer Electrolyte with Addition of Bamboo Charcoal

Blends of Poly(vinyl Pyridine)s and Dihydric Phenols: Thermal and Infrared Spectroscopic Studies. Part V

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

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