Electric modulus and interfacial polarization in composite polymeric systems

Tsangaris, G.M.; Psarras, G. C.; Kouloumbi, N.

doi:10.1023/a:1004398514901

Cited by 579 publications

(327 citation statements)

References 17 publications

Supporting

Mentioning

304

Contrasting

Unclassified

Order By: Relevance

“…27,28 For our studied composites, the electric modulus presentation and the relaxation behavior can be attributed to MWS effect. The frequency dependent of M 00 for pure PVA and that doped with 10 wt.…”

Section: Electric Modulus Formalismmentioning

confidence: 71%

Dielectric relaxation and alternating current conductivity of lanthanum, gadolinium, and erbium-polyvinyl alcohol doped films

Hanafy¹

2012

Journal of Applied Physics

View full text Add to dashboard Cite

Fourier transform infrared (FTIR) spectrum dielectric constant, e 0 , loss tangent, tan(d), electric modulus, M*, and ac conductivity, r ac , of pure polyvinyl alcohol (PVA) as well as La-, Gd-, and Er-PVA doped samples have been carried out. The dielectric properties have been studied in the temperature and frequency ranges; 300-450 K and 1 kHz-4 MHz, respectively. FTIR measurements reveal that La 3þ , Gd 3þ , and Er 3þ ions form complex configuration within PVA structure. Two relaxation processes, namely, q and a were observed in pure PVA sample. The first process is due to the interfacial or Maxwell-Wagner-Sillers polarization. The second one is related to the micro-Brownian motion of the main chains. For doped PVA samples, a-relaxation process splits into a a and a c . This splitting is due to the segmental motion in the amorphous (a a ) and crystalline (a c ) phases of PVA matrix. Electric modulus analysis was discussed to understand the mechanism of the electrical transport process. The behavior of ac conductivity for all PVA samples indicates that the conduction mechanism is correlated barrier hopping. V C 2012 American Institute of Physics. [http://dx

show abstract

Section: Electric Modulus Formalismmentioning

confidence: 71%

Dielectric relaxation and alternating current conductivity of lanthanum, gadolinium, and erbium-polyvinyl alcohol doped films

Hanafy¹

2012

Journal of Applied Physics

View full text Add to dashboard Cite

show abstract

“…To overcome the electrode polarization effect and to resolve low frequency relaxation, 'electric mod- ulus' formalism is used for the study of dielectric relaxations. The electric modulus formalism is introduced by McCrum et al [11] and it is used to study electrical relaxation phenomena in many polymers [25][26][27]. The electric modulus is defined by the Equation (2): (2) where M′ and M″ are the real and the imaginary part of electric modulus respectively, and ε′ and ε″ are the real and the imaginary part of dielectric permittivity.…”

Section: Temperature Dependence Of Dielectric Constantmentioning

confidence: 99%

Dielectric relaxations in PVDF/BaTiO3 nanocomposites

Chanmal¹,

Jog²

2008

Express Polym. Lett.

293

164

View full text Add to dashboard Cite

Abstract. The present work aims at the study of molecular relaxations in PVDF/BaTiO3 nanocomposites using broadband dielectric spectroscopy. The nanocomposites of PVDF with BaTiO3 (10-30% by wt%) are prepared using simple melt mixing method. In dielectric permittivity study, two relaxation processes are identified corresponding to the crystalline, glass transition in the PVDF/BaTiO3 nanocomposites. The peaks shift to higher frequencies as the temperature is increased. Electric modulus formalism is used to analyze the dielectric relaxations to overcome the conductivity effects at low frequencies. In M″ spectra two peaks are observed only at high temperature and low frequency whereas a single relaxation peak appears at low temperatures. The single relaxation peak appearing at low temperatures is the αc relaxation attributed to crystalline chain relaxation in PVDF and the second relaxation peak which appears only at high temperatures and at a frequency lower than αc relaxation is identified as MWS relaxation. The temperature dependence of αc relaxation and MWS relaxation follows Arrhenius type behavior.

show abstract

“…Dielectric spectra reflect the same chain motions as the mechanical modulus; however it has reduced interference due to symmetry from shorter time process making it more accurate than the traditional dynamic mechanical analysis [35]. The 'electric modulus' formalism first introduced by McCrum et al [36] and extensively used for the investigation of relaxation phenomena in polymer composites by Tsangaris et al [37,38] can be defined as the inverse quantity of complex permittivity and is given by the following expression (Equation (6)):…”

Section: Dielectric Relaxation Spectramentioning

confidence: 99%

Physico-mechanical and electrical properties of conductive carbon black reinforced chlorosulfonated polyethylene vulcanizates

Nanda¹,

Tripathy²

2008

Express Polym. Lett.

View full text Add to dashboard Cite

Abstract. The present work deals with the effect of conductive carbon black (Ensaco 350G) on the physico-mechanical and electrical properties of chlorosulfonated polyethylene (CSM) rubber vulcanizates. The physico-mechanical properties like tensile strength, tear strength, elongation at break, compression set, hardness and abrasion resistance have been studied before and after heat ageing. Up to 30 parts per hundred rubber (phr) filler loading both tensile and tear strength increases beyond which it shows a decreasing trend whereas modulus gradually increases with the filler loading. Incorporation of carbon black increases the hysteresis loss of filled vulcanizates compared to gum vulcanizates. Unlike gum vulcanizate, in filled vulcanizates the rate of relaxation shows increasing trend. The bound rubber content is found to increase with increase in filler loading. Dielectric relaxation spectra were used to study the relaxation behavior as a function of frequency (100 to 10 6 Hz) at room temperature. Variation in real and imaginary parts of electric modulus has been explained on the basis of interfacial polarization of fillers in the polymer medium. The percolation limit of the conductive black as studied by ac conductivity measurements has also been reported.

show abstract

Electric modulus and interfacial polarization in composite polymeric systems

Cited by 579 publications

References 17 publications

Dielectric relaxation and alternating current conductivity of lanthanum, gadolinium, and erbium-polyvinyl alcohol doped films

Dielectric relaxation and alternating current conductivity of lanthanum, gadolinium, and erbium-polyvinyl alcohol doped films

Dielectric relaxations in PVDF/BaTiO3 nanocomposites

Physico-mechanical and electrical properties of conductive carbon black reinforced chlorosulfonated polyethylene vulcanizates

Contact Info

Product

Resources

About