Electrical and dielectric properties of poly(1,3,4-oxdiazole) nanocomposite films with graphene sheets dispersed in layers

In this paper, the copolymer of 4-diethanolaminomethyl styrene (DEAMSt) with benzyl methacrylate (BMA) was synthesized and characterized using various spectral techniques such as FT-IR, 1 H-NMR, elemental analysis, SEM, XRD, TGA, DTA, and DSC. e copolymer-metal complexes were prepared with Co(II), Ni(II), and Zn(II) metal ions, and poly(DEAMSt-co-BMA) was used as ligand. e copolymer-metal complexes were characterized using elemental analysis. FT-IR, SEM, XRD, magnetic measurements, and the thermal behaviors of the copolymer-metal complexes were studied using TGA, DTA, and DSC. e compositions of DEAMSt and BMA in the copolymer by 1 H-NMR spectra were determined as 0.49 and 0.51, respectively. Both poly(DEAMSt-co-BMA) and poly(DEAMSt-co-BMA)-Zn complexes were heated up to various temperatures. As the temperature increased, the intensities of O-H stretching bands at 3125-3429 cm −1 resulting from hydrogen bond decreased and shifted to high frequency. Gel permeation chromatography was used to determine the average molecular weights and polydispersity index of the poly(DEAMSt0.49-co-BMA) ligand. Both the molecular formula and C, H, and N % were estimated using elemental analysis, and the amounts of metal by mole (%) in the complexes were estimated by SEM-EDX measurements. e XRD patterns of ligand and metal complexes showed that they were of an amorphous nature. e synthesized metal complexes were annealed at 100°C for 1 h in order to obtain crystalline metal complexes. After annealing at 100°C, the metal complexes showed the crystalline structure. e SEM and XRD analysis of the metal complexes confirmed that metal ions contributed to the structure of the ligand. According to the magnetic measurements, it was suggested that geometrical structure for all complexes was tetrahedral geometry and the ratio of ligand to metal was found to be 2 : 1. e dielectric measurements of the ligand and its metal complexes were investigated depend on frequency.of ligands with transition metal ions [8][9][10]. Polymer metal complexes are used in many applications, such as alkali and alkaline earth metal ion separation [11], organic synthesis and nuclear chemistry [12], thermal stability, electrical conductivity, separation, photofunctions, catalytic activity, and biomedicine, gels, and ointments for medical use [13,14]. In addition, polymer-metal complexes are used as models for bioinorganic systems, as well as mechanochemical systems [11,15,16].In the present study, the poly(DEAMSt-co-BMA) was synthesized using free-radical polymerization, and this copolymer system was used as ligand. e copolymer-metal complexes were prepared with Co(II), Ni(II), and Zn(II) metal ions. e resulting copolymer and its metal complexes

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“…Similar results were found in the dielectric loss factor. A similar type of dielectric behavior is reported in the literature [40,41].…”

Section: Dielectric Propertiessupporting

confidence: 86%

Synthesis, Characterization, and Dielectric Behaviors of 4-Diethanolaminomethyl Styrene and Benzyl Methacrylate Copolymer and Its Metal Complexes

Açıkses

Öksüz

2019

Journal of Chemistry

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“…X‐ray diffraction patterns of the composite films containing 10.0 wt % hybrid carbon nanofillers show only broad amorphous halo scattering without any noticeable diffraction peak associated with ordered crystalline structures. For PG10 film, a weak broad peak at ∼25° was observed, which is associated with the formation of an anisotropically oriented structure of 2D graphene sheets in the composite film during the solution casting process . However, for PMG films, the peak at ∼25° was much broader and less intense.…”

Section: Resultsmentioning

confidence: 96%

“…Pristine MWCNT (CM‐95, Hanwha Chemical Corp., Seoul, Republic of Korea) with 10–15 nm diameter and 10–20 μm length, produced by thermal chemical vapor deposition, was chosen as 1D reinforcing carbon nanofiller. Graphene sheets as 2D carbon nanofiller were prepared by acid‐induced intercalation of natural graphite flakes (Sigma‐Aldrich, St. Louis, MO, USA), thermal expansion of graphite oxide, and untrasonicaton of graphite nanoplatelets . First, to obtain intercalated graphite oxide flakes, the natural graphite flakes (20 g) were added into a round flask containing sulfuric acid (320 mL) and nitric acid (180 mL) in an ice bath and they were stirred for 20 min.…”

Section: Methodsmentioning

confidence: 99%

“…Many researches have also revealed that polymer composites including 1‐dimensional (1D) or 2‐dimensional (2D) carbon nanofillers can be utilized in advanced areas including sensors, actuators, electrodes, supercapacitors, electrostatic dissipation/electromagnetic interference (ESD/EMI) shielding materials for electronic devices and components . Also, POD‐based composites reinforced with CNT or graphene have been recently delved . Gomes et al .…”

Section: Introductionmentioning

confidence: 99%

“…have found that POD composite film with 1.0 wt % MWCNT, which was fabricated by a solution mixing route, has high mechanical performance of tensile strength of ∼220 MPa, elongation at break of ∼116%, and toughness of ∼178 MJ/m 2 , in addition to relatively low electrical resistivity of ∼1.5 × 10 6 Ω cm . We have recently investigated microstructures, electrical, and dielectric properties of sulfonated POD (sPOD)‐based composite films containing 0.1–10.0 wt % graphene sheets in a wide frequency range from 20 Hz to 2 MHz . It was revealed that the graphene sheets were dispersed by forming a layered structure in the composite films with graphene loadings >2.0 wt %.…”

Section: Introductionmentioning

confidence: 99%

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Influences of hybrid carbon nanofillers on structures and electrical properties of sulfonated poly(1,3,4‐oxadiazole)‐based composite films

Lee

Jeong

2016

J of Applied Polymer Sci

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Sulfonated poly(1,3,4-oxadiazole) (sPOD)-based composite films, including 10 wt % hybrid carbon nanofillers composed of different weight ratios of multiwalled carbon nanotube (MWCNT) and graphene sheets, were manufactured via an efficient ultrasonication-assisted solution mixing and casting. Fourier transform infrared (FTIR) spectra of the composite films confirmed the existence of specific interactions between sPOD backbone and MWCNT or graphene sheet. Transmission electron microscopic (TEM) images of cross sections of the composite films showed that 2-dimensional (2D) graphene sheets formed an anisotropically oriented structure in the sPOD matrix film, but they are randomly dispersed owing to the introduction of 1-dimensional (1D) MWCNT. Accordingly, the electrical resistivity of the composite films decreased largely from 10 3 X cm to 10 1 X cm with the increment of the relative MWCNT content in hybrid carbon nanofillers due to the synergistic bridging effect. Thus, sPOD-based composite films with 10 wt % hybrid carbon nanofillers exhibited high performance in electric heating by attaining rapid temperature responsiveness, high electric power efficiency, and stable maximum temperatures under given applied voltages. It was also revealed that the hybrid composite films were operationally stable over a long-term stepwise electric heating experiment. V C 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44499.

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Enhanced dielectric properties of all-organic acrylic resin elastomer-based composite with doped polyaniline

Wang

et al. 2017

Polym. Bull.

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Electrical and dielectric properties of poly(1,3,4-oxdiazole) nanocomposite films with graphene sheets dispersed in layers

Cited by 6 publications

References 24 publications

Synthesis, Characterization, and Dielectric Behaviors of 4-Diethanolaminomethyl Styrene and Benzyl Methacrylate Copolymer and Its Metal Complexes

Synthesis, Characterization, and Dielectric Behaviors of 4-Diethanolaminomethyl Styrene and Benzyl Methacrylate Copolymer and Its Metal Complexes

Influences of hybrid carbon nanofillers on structures and electrical properties of sulfonated poly(1,3,4‐oxadiazole)‐based composite films

Enhanced dielectric properties of all-organic acrylic resin elastomer-based composite with doped polyaniline

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