Influence of microwave irradiation on thermal properties of PVA and PVA/graphene nanocomposites

Afzal, Hafiz Muhammad; Shehzad, Farrukh; Zubair, Mukarram; Bakather, Omer Y.; Al‐Harthi, Mamdouh A.

doi:10.1007/s10973-019-08419-x

Cited by 27 publications

(17 citation statements)

References 52 publications

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“…The higher thermal stability of IL based PVA/GO nanocomposites is mostly due to the formation of hydrogen bonding and π‐π interaction because of the possible delocalization of π‐electron cloud of imidazolium carbocation of AMIC with the π‐electron cloud of GO platelets. [ 37 ] The higher yield of residual char for PVA/3GO/IL system in comparison with virgin PVA and PVA/GO system has been confirmed from Figure 5A, which is another evidence of improved thermal stability as well as flammability.…”

Section: Resultsmentioning

confidence: 72%

Significant enhancement of dielectric properties of graphene oxide filled polyvinyl alcohol nanocomposites: Effect of ionic liquid and temperature

2020

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Fabrication of polymer nanocomposites with excellent dielectric properties in an environmentally friendly approach is a challenging job. Nanocomposites based on polyvinyl alcohol (PVA) and graphene oxide (GO) are fabricated using deionized water by solvent casting technique. The agglomerations, intercalation, and exfoliation pattern of dispersion of GO phase in the interface are observed in HRTEM and FESEM photomicrographs.1-Allyl-3-methyl imidazolium chloride (AMIC) as ionic liquid (IL) is incorporated for better dispersion and compatibility. The Fourier-transform infrared (FTIR) and Raman analysis confirms the establishment of hydrogen bonding and cation-π interaction between AMIC and GO platelets. The enhancement of the tensile results up to 2 wt% of GO loading ensures the reinforcing nature of GO. Further increase in tensile strength in IL contend systems ensure the bridging activity, which facilitates the stress transfer at the interface. The effect of GO loading, IL, and temperature on the dielectric properties, such as dielectric permittivity (ε 0), AC conductivity (σ ac), impedance (Z 0 and Z 00), and Nyquist plot are explored. The significant enhancement in ε 0 with the incorporation of GO loading level and IL in an external electric field is mostly due to the increase in polarizable dipoles and migration of electric charge carriers, which result the accumulation of charge particles with different relaxation time at the interface. The interfacial polarization phenomena become more frequent at higher temperature, which again results increase in ε 0. A remarkable increase in σ ac and reduction of Z 0 and Z 00 of the fabricated PVA/GO systems with an increase in GO loading level ensures the pronounced tunneling and hopping phenomenon at the interface. The diminished area obtained under the Nyquist plots with increase in GO loading level and temperature ensures about the decrease in bulk resistivity (R B) and increase in charge storing ability of the developed systems. The significant improvement in dielectric properties at higher temperature reveals the negative temperature coefficient behavior of resistance (NTC) of the developed systems.

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Section: Resultsmentioning

confidence: 72%

Significant enhancement of dielectric properties of graphene oxide filled polyvinyl alcohol nanocomposites: Effect of ionic liquid and temperature

2020

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“…ESI S4 † ). 33 The increase in surface area and pore volume might be due to the thermal exfoliation of the graphene sheets and decomposition of PVA, respectively.…”

Section: Resultsmentioning

confidence: 99%

Pickering-emulsion-templated synthesis of 3D hollow graphene as an efficient oil absorbent

et al. 2021

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“…The peak at 1425 cm −1 corresponds to the bending vibration of CH2 [10]. The peaks at 839 cm −1 , 1081 cm −1 , and 1324 cm −1 are associated with C-C stretching vibration, C-O stretching vibration of acetyl groups, and the presence of C-H deformation [11]. For the PVA/PbTiO3 composite, several peaks could be observed, with a belt additive of 713 cm −1 indicating metal oxygen stretching, which in turn shows the presence of metal oxygen bonds.…”

Section: Atr-ftirmentioning

confidence: 98%

Optical Investigation of PVA/PbTiO3 Composite for UV-Protective Approach Applications

El-Deeb

Kader

Nasr

et al. 2021

The 2nd International Electronic Conference on Applied Sciences

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Samples of a new-fangled polymer of poly (Vinyl Alcohol) (PVA) doped with various concentrations of Lead (II) Titanate (PbTiO3, PT) were prepared using the casting method. The prepared samples were identified by Attenuated Total Reflection–Fourier Transform Infrared (ATR-FTIR). Peaks characteristic of PVA at 3280, 2917, 1690, 1425, 1324, 1081, and 839 cm−1 appeared; a peak indicating the presence of PbTiO3 also appeared at 713 cm−1. The interaction between PVA and PbTiO3 was confirmed by observing the change in IR absorption intensity. Optical properties in the UV-Vis range were investigated using an Ultraviolet Visible technique (UV-Vis). An enhancement in absorption capacity by the increasing PbTiO3 concentration was observed. Optical properties such as band gap energy, Urbach energy, and extinction coefficient indicate that addition of PbTiO3 into the PVA polymer induced variance in internal states by increasing the ratio of PbTiO3. Obtaining a UV-protective material derived from a PVA/PbTiO3 composite is the aim of this paper.

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Influence of microwave irradiation on thermal properties of PVA and PVA/graphene nanocomposites

Cited by 27 publications

References 52 publications

Significant enhancement of dielectric properties of graphene oxide filled polyvinyl alcohol nanocomposites: Effect of ionic liquid and temperature

Significant enhancement of dielectric properties of graphene oxide filled polyvinyl alcohol nanocomposites: Effect of ionic liquid and temperature

Pickering-emulsion-templated synthesis of 3D hollow graphene as an efficient oil absorbent

Optical Investigation of PVA/PbTiO3 Composite for UV-Protective Approach Applications

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