Microwave properties of poly(4,4′-diphenylene diphenylvinylene)

Phang, Sendy; Daik, Rusli; Abdullah, Maimon

doi:10.1016/j.polymertesting.2003.08.006

Cited by 20 publications

(22 citation statements)

References 11 publications

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“…The complex scattering parameters correlated to reflection (

S_{11}^{*}

) of transerver electromagnetic (TEM) were determined and complex scattering

S_{11}^{*}

which depends on a model of single‐layered plane wave absorber backed by an excellent conductor were measured. Hence, the transmission of the microwave was assumed as 0 % from 0.4 to 18 GHz . Furthermore, complex dielectric permittivity (ε r * = ε r ′ – jε r ″) and complex magnetic permeability (μ r * = μ r ′ – μ r ″) which consist of real (ε r ′ or μ r ′) and imaginary (ε r ″or μ r ″) part were also investigated.…”

Section: Methodsmentioning

confidence: 99%

“…These are due to the conducting state of the polymer. The peaks at 1,303 cm -1 and 1,279 cm -1 show the CAN stretching vibration of PAni while quinoid unit of doped-PAni at 1,134 cm -1 [24,25]. The strong characteristic band at 1,134 cm -1 was the "electron-like band" that was described by MacDiarmid et al that it is the measure of delocalization of electrons, which is related to the conductivity of PAni nanocomposites [26].…”

Section: Chemical Characterizationsmentioning

confidence: 96%

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Effect of microwave absorption study on polyaniline nanocomposites with untreated and treated double wall carbon nanotubes

2016

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Hexanoic acid (HA) doped polyaniline (PAni) nanocomposites which consist of different contents of untreated double wall carbon nanotubes (u‐DWNT) and carboxyl treated DWNT (c‐DWNT) with titanium dioxide nanoparticles were successfully prepared using template‐free method. Fourier transform infrared, ultraviolet‐visible and X‐ray diffractometer spectra clearly confirmed the chemical structure of PAni nanocomposites. Thermal stability, morphology, conductivity, magnetic properties and reflection loss of PAni nanocomposites were characterized by thermogravimetric analyzer, field emission scanning electron microscope, four‐point probe, vibrating sample magnetometer and microwave vector network analyzer, respectively. From this study, it is shown that electrical conductivity of PAni nanocomposites with u‐DWNT possessed higher conductivity (1.23 × 10–1 to 1.31 × 100 S/cm) compared to c‐DWNT (3.43 × 10–2 to 4.48 × 10–1S/cm). PAni/HA/TiO2/DWNT nanocomposites with 20% of c‐DWNT have been covered by PAni layers to form the highest amount of nanorods/nanotubes. Hence, it shows high heterogeneity that will enhance the dielectric permittivity and contribute to a more disordered motion of charge carriers along the PAni backbone. Therefore, it will eventually contribute to good microwave absorption and potentially apply as an efficient electromagnetic interference shielding material in cell phones. POLYM. COMPOS., 39:1283–1291, 2018. © 2016 Society of Plastics Engineers

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“…The complex scattering parameters correlated to reflection (

S_{11}^{*}

) of transerver electromagnetic (TEM) were determined and complex scattering

S_{11}^{*}

Section: Methodsmentioning

confidence: 99%

Section: Chemical Characterizationsmentioning

confidence: 96%

Effect of microwave absorption study on polyaniline nanocomposites with untreated and treated double wall carbon nanotubes

2016

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“…A two-port calibration was performed before testing in order to reduce or remove errors. [18,19] Results and Discussion Table 1 shows Ani and STF mass (g), ratio Ani/STF (% w/w) used for this study, PAni- DBSA/STF experimental mass (g) and PAni-DBSA/STF compositions (% w/w) after syntheses. Table 1 and Figure 2 show volume resistivity values of all materials.…”

Section: Electromagnetic Propertiesmentioning

confidence: 99%

“…The influence of composition on reflected, transmitted and absorbed power (Figure 3 [18,19] P R ¼ P I ðSÃ 11 Þ 2 (1)…”

Section: Effect Of Compositionmentioning

confidence: 99%

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Study of Microwave Absorbing Properties of Polyaniline/STF Conducting Composites Prepared by in Situ Polymerization

Schettini

Soares

2011

Macromolecular Symposia

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Summary: Conducting composites of polyaniline doped with dodecylbenzenesulfonic acid (PAni-DBSA) and poly(styrene-b-styrene-butadiene-b-styrene) (STF) as supporting matrix were prepared by in situ synthesis. The influence of composition and thickness on the electromagnetic properties and shielding effectiveness (SE) of the materials was evaluated using a microwave network analyzer and a standard rectangular waveguide from 8.2-12.4 GHz (X-band). It was found that the composition 49/51 exhibited the best SE and the higher values of reflected power (P R ), e 0 , e 00 and e Ã . The compositions 12/88 and 17/83 presented the higher values of transmitted power (P T ) and absorbed power (P A ), respectively. The composition 25/75 presented the higher value of tan d. The thickness of 5Â showed the best SE and higher value of P R . The higher value of transmitted power (P T ) was obtained for thickness of 1Â. The values of P A were similar for all thicknesses. The thickness of 1x showed the higher values of e 0 , e 00 , e Ã and tan d.

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Poly(vinylidene fluoride‐co‐hexafluorpropylene)/polyaniline conductive blends: Effect of the mixing procedure on the electrical properties and electromagnetic interference shielding effectiveness

Pontes

Indrusiak

Soares

2020

J of Applied Polymer Sci

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Poly(vinylidene fluoride-co-hexafluoropropylene)/polyaniline (PVDF-co-HFP/ PAni) conductive blends were prepared by two methodologies involving the in situ polymerization in two different media and dry blending approach using ball milling. Dodecylbenzenesulfonic acid (DBSA) was used both as surfactant and as protonating agent in PAni synthesis. X-ray diffraction (XRD), scanning electron microscopy (SEM), ultraviolet-visible (UV-Vis) spectroscopy, and thermogravimetric analysis were used for characterizing the blends. PAni and PVDF/PAni prepared by in situ polymerization in H 2 O/toluene medium exhibited superior electrical conductivity, higher thermal stability and significantly higher electromagnetic interference shielding effectiveness (EMI SE) than those prepared in H 2 O/dimethylformamide (DMF) medium. PVDF/PAni with high-PAni content (>40%) prepared by the dry blend approach presented higher conductivity and EMI SE than those prepared by in situ polymerization.

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Microwave properties of poly(4,4′-diphenylene diphenylvinylene)

Cited by 20 publications

References 11 publications

Effect of microwave absorption study on polyaniline nanocomposites with untreated and treated double wall carbon nanotubes

Effect of microwave absorption study on polyaniline nanocomposites with untreated and treated double wall carbon nanotubes

Study of Microwave Absorbing Properties of Polyaniline/STF Conducting Composites Prepared by in Situ Polymerization

Poly(vinylidene fluoride‐co‐hexafluorpropylene)/polyaniline conductive blends: Effect of the mixing procedure on the electrical properties and electromagnetic interference shielding effectiveness

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