Electrical properties of two-armed poly(Ɛ-CL-co-BMA) composites filled with bentonite

Pıhtılı, Güzin; Torğut, Gülben; Biryan, Fatih

doi:10.1007/s10965-020-02119-z

Cited by 12 publications

(5 citation statements)

References 40 publications

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“…Possibly, lanthanum entered the structure, reducing thermal stability. [ 14 ] In addition, as the amount of lanthanum increased in the composite structure, the initial and decomposition temperatures began to increase. Again, while pure copolymer ε‐CL‐co‐EO left 2% waste, as the amount of lanthanum in the composite structure increased (20% La‐composite) it left 18% waste.…”

Section: Resultsmentioning

confidence: 99%

“…This result is compatible with the studies in the literature. [ 14,40 ] On the other hand, IZI is a minimum for each sample, which is shifted to a higher frequency. The IZI values of each sample in Figure 8 are shown in Table 4.…”

Section: Resultsmentioning

confidence: 99%

“…It is an effective way to characterize the charge transfer within the material in complex components. [ 14 ] The plots of IZI versus frequency for pure poly(ε‐CL‐co‐EO) and (ε‐CL‐co‐EO)/La composites with different La amounts are shown in Figure 9A and Figure 9B, respectively. With increasing La amount % the value of IZI decreases at room temperature.…”

Section: Resultsmentioning

confidence: 99%

“…Possibly, lanthanum entered the structure, reducing thermal stability. [14] In addition, as the amount of lanthanum increased in the composite structure, the initial and 3, respectively. Glass transition temperature (T g ) values of the copolymer and composites doped with lanthanum could not be observed in the investigated temperature ranges.…”

Section: Thermal Propertiesmentioning

confidence: 99%

“…Polymer dielectrics, which have low cost, ease of processing and mechanical flexibility, are preferred for portable electronics applications. [11][12][13][14][15] Generally, polymers with a low-dielectric constant are suitable for obtaining new polymer composite materials. [16] The dielectric properties of these materials change depending on the factors (preparation method, volume ratio, interaction between filler and polymer, size and shape of conductive filler) during preparation.…”

Section: Introductionmentioning

confidence: 99%

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Improving dielectric properties, electrical conductivity, and thermal properties of biodegradable polymer composites prepared with lanthanum

2022

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The precipitation method was adapted to synthesize the poly(ε-caprolactonecopolymer-ethylene oxide) (ε-CL-co-EO) composite with the salt of lanthanum (La), a rare earth element. This salt was incorporated into the polymer of different weight percentages to study how it affects the thermal and dielectric properties of the polymer. The resulting products were characterized by Fourier Transform Infrared Spectroscopy, X-ray diffractometry (XRD), Scanning electron microscopy (SEM) and thermogravimetric analysis. XRD and SEM data show that the polymer mixes homogeneously with the metal salt. Thermal degradation data show that the thermal stability of composites synthesized with La is lower than that of pure polymer. The dielectric properties and A.C conductivity measurements of the composites were investigated by using impedance analyzer in the frequency range (100 Hz to 20 kHz) at room temperature. The electrical property results of (ε-CL-co-EO)/La composites displayed that dielectric constant (έ), dielectric loss (ε"), tan delta (tan δ) and A.C electrical conductivity (σ ac ) increase with increasing La content. The largest conductivity of (ε-CL-co-EO)/La composite filled with 20 wt% La was 8.80 Â 10 À8 S/cm, which was 162% times pure (ε-CL-co-EO). In addition, impedance (IZI) of composites was evaluated from the dielectric data. This procedure is eco-friendly and easy to handle, which provides a promising route to polymer composites in the application of the conductivity field.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Thermal Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Improving dielectric properties, electrical conductivity, and thermal properties of biodegradable polymer composites prepared with lanthanum

2022

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Molecular weight and concentration of poly (acrylic acid) dual‐responsive homogeneous and intrafibrillar collagen mineralization using an in situ co‐organization strategy

Shen

Zhang

et al. 2021

Polymer Composites

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Intrafibrillar mineralization is crucial in the synthesis of collagen-hydroxyapatite (HAP) composites with hierarchical structure resembling natural bone. The polymer-induced liquid precursor method, which involves immersing the matrix into polymer-stabilized amorphous calcium phosphate (ACP) solutions, has been widely used to regulate collagen mineralization; however, heterogeneous infiltration and crystallization of ACP precursors from the surface to the inner matrix remain a concern. In this study, the polymer-mediated co-organization strategy in which poly (acrylic acid) (PAA)-stabilized ACP solutions were initially introduced to collagen solutions before sol-gel transformation was employed to achieve homogeneous mineralization. Moreover, the effects of PAA with various molecular weights (2, 10, and 450 kDa) and concentrations (40, 80, and 120 mg/L) on collagen mineralization were evaluated. Increasing concentration and decreasing molecular weight both improved the stability of ACP precursors, which affected collagen mineralization. A lower concentration (40 mg/L) of 2 kDa PAA and higher concentration (80 and 120 mg/L) of 100 and 450 kDa PAA effectively retarded ACP crystallization, thereby inducing intrafibrillar mineralization.Extremely unstable ACP precursors failed to infiltrate the interior of fibrils using 100 and 450 kDa of PAA at 40 mg/L, resulting in extrafibrillar mineralization.Inversely, collagen fibrils were unmineralized until 7 days owing to excessive stability of ACP precursors using 2 kDa of PAA at higher concentrations. The present results further explain the mechanisms of intrafibrillar mineralization, and may provide a facile method for producing biomimetic materials.

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Structural, Dielectric, and Electrical Properties of Chitosan Composites Doped with Silver for Electrochemical Applications

Ayhan,

Torgut

2024

ChemistrySelect

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In this study, chitosan‐silver (Chs‐Ag) composites containing Ag in different concentrations (0.01–0.08 M) were prepared. The characterization and structure studies of the composites containing 0.01, 0.02, 0.04, and 0.08 M Ag were carried out, and then the dielectric properties of these composites were examined. The composites were characterized by Fourier transform infrared spectrophotometer (FTIR), scanning electron microscopy and energy dispersive spectroscopy (SEM‐EDS), and thermogravimetric analysis (TGA). The dielectric and electrical properties of these composites were investigated depending on the frequency at room temperature, and these properties were determined using an impedance analyzer. Spectroscopy revealed that the dielectric constant (ε′), dielectric loss (ε′′), and real (Z′) and imaginary (Z″) components of impedance are found to decrease with increased frequency for both Chs and Chs‐Ag (0.01M–0.08 M) composites. On the contrary, the AC conductivity (σac) of samples increased with increasing frequency. ε′ and ε′′ values of Chs were lower than when the Ag was added. The AC conductivity was improved by the addition of silver particles. The results show that the dielectric and electrical properties of Chs‐Ag samples were improved by using Ag as filler.

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Electrical properties of two-armed poly(Ɛ-CL-co-BMA) composites filled with bentonite

Cited by 12 publications

References 40 publications

Improving dielectric properties, electrical conductivity, and thermal properties of biodegradable polymer composites prepared with lanthanum

Improving dielectric properties, electrical conductivity, and thermal properties of biodegradable polymer composites prepared with lanthanum

Molecular weight and concentration of poly (acrylic acid) dual‐responsive homogeneous and intrafibrillar collagen mineralization using an in situ co‐organization strategy

Structural, Dielectric, and Electrical Properties of Chitosan Composites Doped with Silver for Electrochemical Applications

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