Preparation and electrical studies on pure and oxygen plasma treated polyvinyl alcohol films

Premkumar, P. Sumithraj

doi:10.1016/j.jmrt.2018.12.023

Cited by 27 publications

(15 citation statements)

References 19 publications

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“…Notably, there is no obvious difference in diffraction patterns of different films, indicating that air plasma treatment does not vary the bulk crystal structure of PVA, which is in line with the findings of a recent study [ 18 ]. Nevertheless, the air plasma irradiation did increase the signal intensities at 19.8°, which is probably attributed to the minor structural changes of PVA molecular chains by plasma irradiation [ 16 ].…”

Section: Resultsmentioning

confidence: 99%

“…As the fourth state of matter, plasma is generated from the ionization of specific gaseous molecules via dissociation of their intrinsic chemical bonds to form a collection of ions, electrons, free radicals, etc. [ 15 , 16 ]. Later, these highly reactive charged or neutral species would target on the surface of treated material during plasma irradiation and trigger scission and crosslinking of surface atoms and functional groups.…”

Section: Introductionmentioning

confidence: 99%

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High-Performance and Water Resistant PVA-Based Films Modified by Air Plasma Treatment

et al. 2022

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Plasma treatment is considered a straightforward, cost-effective, and environmental-friendly technique for surface modification of film materials. In this study, air plasma treatment was applied for performance improvement of pure PVA, cellulose nanocrystal (CNC)/PVA, and CNC/oxalic acid (OA)/PVA films. Compared with the original performance of pure PVA, the mechanical properties and water resistance of air plasma treated films were greatly improved. Among them, the CNC/OA/PVA film treated by three minutes of air plasma irradiation exhibits the most remarkable performance in mechanical properties (tensile strength: 132.7 MPa; Young’s modulus: 5379.9 MPa) and water resistance (degree of swelling: 47.5%; solubility: 6.0%). By means of various modern characterization methods, the wettability, surface chemical structure, surface roughness, and thermal stability of different films before and after air plasma treatment were further revealed. Based on the results obtained, the air plasma treatment only changed the surface chemical structure, surface roughness, and hydrophobicity, while keeping the inner structure of films intact.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High-Performance and Water Resistant PVA-Based Films Modified by Air Plasma Treatment

et al. 2022

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“…Thus, it is reasonable that the grooved structure obtained by the cooperation of the rubbing and the anisotropic plasma treatment parallel to the rubbing direction contributed to the planar orientation of the RM molecules. It is thought that the PVA surface is weakened by the plasma treatement along the plasma direction [31,32]. On such a soft surface, the rubbing process can result in a grooved pattern.…”

Section: Resultsmentioning

confidence: 99%

Enhancement of Planar Orientation of Reactive Mesogen Molecules for Optical Retarder Film by Anisotropic Surface Plasma Treatment

Kim

Lee

2021

Crystals

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We proposed a method for enhancing the planar orientation of reactive mesogen (RM) molecules by means of anisotropic plasma treatment. Anisotropic surface plasma, of which energy density is dependent on the azimuthal angle, was generated by column-shaped ceramic electrodes. The anisotropic plasma was discharged on the surface of a polyvinyl alcohol (PVA) alignment layer before the rubbing process began. The contact angle of the surface was increased from 12° to 83° after plasma treatment, indicating a hydrophobic property of the surface. From the atomic force microscopy (AFM) measurement, it was found that the grain size of the PVA layer was reduced and that the grooved patterns were formed provided that the plasma direction was parallel to the rubbing direction of the surface. Consequently, the planar orientation was enhanced, and the in-plane retardation of the photo-polymerized RM films increased when the parallel plasma was treated on the surface.

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“…All the prepared samples showed the Arrhenius type behaviour and observed that there are two activation energies in the temperature range considered. 22 3. These plots have a nature similar to intrinsic-to-extrinsic transition found in an electronic semiconductor.…”

Section: Electrical Studiesmentioning

confidence: 99%

Structural and electrical studies on zinc added magnesium oxide nanoparticles

Premkumar¹

2020

JPS

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Magnesium oxide (MgO, pure) and zinc added MgO nanoparticles were synthesised by a simple microwave assisted solvothermal method. The concentrations of impurity used in the present work were 0.25 M and 0.50 M. All samples were annealed at 400°C for 1 h to improve the ordering. The prepared pure and zinc added magnesium oxide nanoparticles were characterised by powder X-ray diffraction (PXRD), energy dispersive spectroscopy (EDS) and scanning electron microscopy (SEM). PXRD studies of pure and zinc added MgO nanoparticles showed that all samples belong to crystalline nature with cubic structure. The grain size of all samples were determined from the XRD results and it belongs to nano meter scale. The EDS confirmed the presence of zinc, magnesium and oxide elements in the respective prepared samples. The scanning electron microscope images confirmed that the prepared samples possess nanometer dimensions. The electrical properties such as AC conductivity, dielectric constant and dielectric loss were measured at different temperatures in the different frequency range by involving the impedance analyser of all the prepared samples.

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Preparation and electrical studies on pure and oxygen plasma treated polyvinyl alcohol films

Cited by 27 publications

References 19 publications

High-Performance and Water Resistant PVA-Based Films Modified by Air Plasma Treatment

High-Performance and Water Resistant PVA-Based Films Modified by Air Plasma Treatment

Enhancement of Planar Orientation of Reactive Mesogen Molecules for Optical Retarder Film by Anisotropic Surface Plasma Treatment

Structural and electrical studies on zinc added magnesium oxide nanoparticles

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