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Jangra M, Thakur A, Dam S, Hussain S. Enhanced dielectric properties of freestanding, flexible, hydrophobic cellulose/poly(vinylidene fluoride) composite films. JOURNAL OF POLYMER SCIENCE 2022. [DOI: 10.1002/pol.20220512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Mandeep Jangra
- UGC‐DAE CSR (Affiliated to University of Madras) Kokilamedu Tamil Nadu India
| | - Abhishek Thakur
- UGC‐DAE CSR (Affiliated to University of Madras) Kokilamedu Tamil Nadu India
| | - Siddhartha Dam
- UGC‐DAE CSR (Affiliated to University of Madras) Kokilamedu Tamil Nadu India
| | - Shamima Hussain
- UGC‐DAE CSR (Affiliated to University of Madras) Kokilamedu Tamil Nadu India
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Yurkov G, Koksharov Y, Fionov A, Taratanov N, Kolesov V, Kirillov V, Makeev M, Mikhalev P, Ryzhenko D, Solodilov V. Polymer Nanocomposite Containing Palladium Nanoparticles: Synthesis, Characterization, and Properties. Polymers (Basel) 2022; 14:3795. [PMID: 36145940 PMCID: PMC9503152 DOI: 10.3390/polym14183795] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2022] [Revised: 09/05/2022] [Accepted: 09/06/2022] [Indexed: 12/03/2022] Open
Abstract
Composite nanomaterials have been prepared through thermal decomposition of palladium diacetate. The composite contains palladium nanoparticles embedded in high-pressure polyethylene. The materials were studied by a number of different physico-chemical methods, such as transmission electron microscopy, X-ray diffraction, X-ray absorption spectroscopy, electron paramagnetic resonance, and EXAFS. The average size of the nanoparticles is 7.0 ± 0.5 nm. It is shown that with the decrease of metal content in the polymer matrix the average size of nanoparticles decreased from 7 to 6 nm, and the coordination number of palladium also decreased from 7 to 5.7. The mean size of palladium particles increases with the growing concentration of palladium content in the matrix. It is shown that the electrophysical properties of the material obtained depend on the filler concentration. The chemical composition of palladium components includes metallic palladium, palladium (III) oxide, and palladium dioxide. All samples have narrow lines (3-5 Oe) with a g factor of around two in the electron paramagnetic resonance (EPR) spectra. It is shown that EPR lines have uneven boarding by saturation lines investigation. The relaxation component properties are different for spectral components. It leads to the spectrum line width depending on the magnetic field value. At first approximation, the EPR spectra can be described as a sum of two Lorentzian function graphs, corresponding to the following two paramagnetic centers: one is on the surface, and one is inside the palladium particles. Some of the experimental characteristics were measured for the first time. The data obtained indicate interesting properties of palladium-based nanocomposites, which will be useful for obtaining products based on these materials.
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Affiliation(s)
- Gleb Yurkov
- N.N. Semenov Federal Research Center of Chemical Physics of Russian Academy of Sciences, 119334 Moscow, Russia
- Department of Structurally Sensitive Functional Materials, Bauman Moscow State Technical University, BMSTU, 2-nd Baumanskaya, 5, 105005 Moscow, Russia
| | - Yury Koksharov
- Faculty of Physics, M.V. Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Alexander Fionov
- Kotelnikov Institute of Radio Engineering and Electronics of Russian Academy of Science, 125009 Moscow, Russia
| | - Nikolai Taratanov
- Ivanovo Institute of State Fire Service of Emercom of Russia, 153040 Ivanovo, Russia
| | - Vladimir Kolesov
- Kotelnikov Institute of Radio Engineering and Electronics of Russian Academy of Science, 125009 Moscow, Russia
| | - Vladislav Kirillov
- N.N. Semenov Federal Research Center of Chemical Physics of Russian Academy of Sciences, 119334 Moscow, Russia
| | - Mstislav Makeev
- Department of Structurally Sensitive Functional Materials, Bauman Moscow State Technical University, BMSTU, 2-nd Baumanskaya, 5, 105005 Moscow, Russia
| | - Pavel Mikhalev
- Department of Structurally Sensitive Functional Materials, Bauman Moscow State Technical University, BMSTU, 2-nd Baumanskaya, 5, 105005 Moscow, Russia
| | - Dmitriy Ryzhenko
- Department of Structurally Sensitive Functional Materials, Bauman Moscow State Technical University, BMSTU, 2-nd Baumanskaya, 5, 105005 Moscow, Russia
| | - Vitaliy Solodilov
- N.N. Semenov Federal Research Center of Chemical Physics of Russian Academy of Sciences, 119334 Moscow, Russia
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A Sequenced Study of Improved Dielectric Properties of Carbon Nanotubes and Metal Oxide-Reinforced Polymer Composites. MATERIALS 2022; 15:ma15134592. [PMID: 35806717 PMCID: PMC9267293 DOI: 10.3390/ma15134592] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Revised: 06/22/2022] [Accepted: 06/24/2022] [Indexed: 01/09/2023]
Abstract
Polymers have gained attraction at the industrial level owing to their elastic and lightweight nature, as well as their astonishing mechanical and electrical applications. Their scope is limited due to their organic nature, which eventually leads to the degradation of their properties. The aim of this work was to produce polymer composites with finely dispersed metal oxide nanofillers and carbon nanotubes (CNTs) for the investigation of their charge-storage applications. This work reports the preparation of different polymeric composites with varying concentrations of metal oxide (MO) nanofillers and single-walled carbon nanotubes (SWCNTs). The successful synthesis of nanofillers (i.e., NiO and CuO) was carried out via the sonication and precipitation methods, respectively. After, the smooth and uniform polymeric composite thin films were prepared via the solution-casting methodology. Spectroscopy and diffraction techniques were used for the preliminary characterization. Scanning electron microscopy was used to check the dispersion of carbon nanotubes (CNTs) and MOs in the polymer matrix. The addition of nanofillers and carbon nanotubes (CNTs) tuned the bandgap, reduced the strain, and enhanced the elastic limit of the polymer. The addition of CNT enhanced the mechanical strength of the composite; however, it increased the conductivity, which was tuned by using metal oxides. By increasing the concentration of NiO and CuO from 2% to 6% bandgap of PVA, which is 5–6 eV reduced to 4.41 and 4.34 eV, Young’s moduli of up to 59 and 57.7 MPa, respectively, were achieved. Moreover, improved dielectric properties were achieved, which shows that the addition of metal oxide enhances the dielectric behavior of the material.
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Alrooqi A, Al-Amshany ZM, Al-Harbi LM, Altalhi TA, Refat MS, Hassanien AM, Atta AA. Impact of Charge Transfer Complex on the Dielectric Relaxation Processes in Poly(methyl methacrylate) Polymer. Molecules 2022; 27:molecules27061993. [PMID: 35335354 PMCID: PMC8953813 DOI: 10.3390/molecules27061993] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Revised: 03/14/2022] [Accepted: 03/15/2022] [Indexed: 01/27/2023] Open
Abstract
The impact of the charge transfer complex on the dielectric relaxation processes in free poly(methyl methacrylate) (PMMA) polymer sheets was investigated. The frequency dependence of dielectric properties was obtained over the frequency range 0.1 Hz–1 MHz at temperatures ranging between 303 K and 373 K for perylene dye and acceptors (picric acid (PA) and chloranilic acid (CLA)) in an in situ PMMA polymer. The TG/dTG technique was used to investigate the thermal degradation of the synthesized polymeric sheets. Additionally, the kinetic parameters have been assessed using the Coats–Redfern relation. The dielectric relaxation spectroscopy of the synthesized polymeric sheets was analyzed in terms of complex dielectric constant, dielectric loss, electrical modulus, electrical conductivity, and Cole–Cole impedance spectroscopy. α- and β-relaxation processes were detected and discussed. The σ(ω) dispersion curves of the synthesized polymeric sheets show two distinct regions with increasing frequency. The impedance data of the synthesized polymeric sheets can be represented by the equivalent circuit (parallel RC).
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Affiliation(s)
- Arwa Alrooqi
- Department of Chemistry, Faculty of Sciences, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia; (A.A.); (Z.M.A.-A.); (L.M.A.-H.)
- Department of Chemistry, Faculty of Arts and Science, Al-Baha University, P.O. Box 1988, Baljurashi 65634, Saudi Arabia
| | - Zahra M. Al-Amshany
- Department of Chemistry, Faculty of Sciences, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia; (A.A.); (Z.M.A.-A.); (L.M.A.-H.)
| | - Laila M. Al-Harbi
- Department of Chemistry, Faculty of Sciences, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia; (A.A.); (Z.M.A.-A.); (L.M.A.-H.)
| | - Tariq A. Altalhi
- Department of Chemistry, College of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia;
- Correspondence:
| | - Moamen S. Refat
- Department of Chemistry, College of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia;
| | - A. M. Hassanien
- Department of Physics, College of Science and Humanities, Shaqra University, P.O. Box 1040, Al Quwaiiyah 11971, Saudi Arabia;
| | - A. A. Atta
- Department of Physics, College of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia;
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