Influence of titanium chloride addition on the optical and dielectric properties of PVA films

Abdelaziz, M.; Ghannam, Magdy M.

doi:10.1016/j.physb.2009.10.030

Cited by 147 publications

(54 citation statements)

References 22 publications

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“…The calculated activation energy for Pure CPVC, CPVC-PEG blend, and CPVC-PES blend are 326 kJ/mol, 240 kJ/mol, and 311 kJ/mol, respectively. The values of Ea are higher than that reported [31][32][33]. This may refer to the existence of micro-homogeneities within the polymeric materials [1].…”

Section: Miscibility Study Based On Tg Analysiscontrasting

confidence: 58%

Miscibility Behavior of Poly Ethylene Glycol or Poly Ethylene Succinate/Chlorinated Poly Vinyl Chloride Blends Studied by Dielectric Relaxation Spectroscopy

Hanafy¹

2013

AMPC

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The miscibility of chlorinated poly vinyl chloride (CPVC) and poly ethylene glycol (PEG) or poly ethylene succinate (PES) had been investigated using dielectric relaxation spectroscopy (DRS) over frequency and temperature ranges; 10 kHz -4 MHz and 300 -450 K, respectively. Three relaxation processes namely ρ-, α'-, and α-relaxation processes were observed for tan(δ) and the electric modulus M" of pure components and blends. The first one was attributed to the space charge polarization or the Maxwell-Wagner polarization. The second one was related to the amorphous regions located between the lamellar crystal stacks. The third one was due to the micro-Brownian motion of CPVC main chains. This process was found to be dependent in respect of temperature and frequency. The molecular dynamics of α-relaxation process were influenced by blending, i.e., the dielectric strength (Δε), the peak broadness, and the peak maximum of tan(δ) were found to be compositional dependent. Electric modulus analysis reveals that there is a role of electrode polarization for the dielectric relaxation.

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Section: Miscibility Study Based On Tg Analysiscontrasting

confidence: 58%

Miscibility Behavior of Poly Ethylene Glycol or Poly Ethylene Succinate/Chlorinated Poly Vinyl Chloride Blends Studied by Dielectric Relaxation Spectroscopy

Hanafy¹

2013

AMPC

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“…ii) The stretching frequency at 1,756.6 cm -1 which corresponds to m (C=O) of pure PVAc is shifted to lower frequencies with the increase in Pb 3 O 4 content as shown in Table 1. The shift in frequency is correlated with the force constant and bond length [18]. Therefore the force constant decreases for m (C=O) bonds with the increase in lead content.…”

Section: Fourier Transform Infrared Spectroscopy (Ft-ir)mentioning

confidence: 95%

Optical and dielectric properties of poly(vinylacetate)/lead oxide composites

Abdelaziz

2011

J Mater Sci: Mater Electron

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Composite films of poly(vinylacetate)/red lead oxide have been prepared by mixing the fine lead oxide particles into polyvinylacetate solution under ultrasonication followed by film casting technique. Structural, optical and dielectric properties have been performed to characterize these composites films and compared their properties to pure PVAc film. The changes in the structural of the prepared films were investigated by X-ray diffraction (XRD) and FT-IR spectra. It has been observed that the crystallinity of the composites films depends on the Pbcontent. Optical spectra of the composites films showed direct allowed band gaps lying in the range of 5.0-4.6 eV which is lower than that of PVAc. Frequency and doping level dependence of dielectric constant (e 0 ), ac conductivity (r ac ) and tangent loss (tand) have been measured. The values of e 0 were decreased with increasing in frequency, which indicates that the major contribution to the polarization comes from orientation polarization. The ac conductivity is more for doped PVAc than that of undoped PVAc. The experimental results show that e 0 and r ac increase with adding of lead oxide in PVAc. The controllable of optical and dielectric properties of the composite film will draw much attention for potential applications.

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“…The absorption coefficient (a) of films depends on optical absorption (A) and the thickness of the film (d) which is evaluated using the relation [22] …”

Section: Optical Absorptionmentioning

confidence: 99%

Effect of Sm3+ substitution on structural, optical and dielectric properties of hydroxypropyl cellulose films

Abdelaziz

2015

J Mater Sci: Mater Electron

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Complexes films composed of mixture of hydroxypropyl cellulose (HPC) and different concentrations of SmCl 3 were prepared by solvent casting technique. Different techniques were used to study the structural changes. The amorphousity of HPC increased with increasing Sm 3? concentration as indicated by XRD and FT-IR results. Optical absorption and fluorescence spectral analysis confirmed the presence of Sm 3? ions. Fluorescence spectra showed that the reddish-orange emission transition 4 G 5/2 ? 6 H 7/2 is more prominent. The nonlinear variation of the optical parameters with respect to Sm 3? content has been explained. The dielectric properties and ac-conductivity of these films were studied in the frequency range of 20 Hz-3 MHz at room temperature. The decrease in the dielectric constant e 0 was observed with the increase in frequency is due to dielectric dispersion. Both e 0 and dielectric loss e 00 are observed increases as Sm 3? ions concentration increased. The frequency and concentration dependence conductivity were also studied. The results showed that the conductivity increase with increasing both frequency and Sm 3? content. Real part electric modulus M 0 was lower at lower frequency but increases as frequency increased. Enhancement of both optical and electrical properties is observed which candidates the prepared films for many applications.

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Influence of titanium chloride addition on the optical and dielectric properties of PVA films

Cited by 147 publications

References 22 publications

Miscibility Behavior of Poly Ethylene Glycol or Poly Ethylene Succinate/Chlorinated Poly Vinyl Chloride Blends Studied by Dielectric Relaxation Spectroscopy

Miscibility Behavior of Poly Ethylene Glycol or Poly Ethylene Succinate/Chlorinated Poly Vinyl Chloride Blends Studied by Dielectric Relaxation Spectroscopy

Optical and dielectric properties of poly(vinylacetate)/lead oxide composites

Effect of Sm3+ substitution on structural, optical and dielectric properties of hydroxypropyl cellulose films

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