Dielectric Relaxation Studies on Polymeric Salts: Poly(methylmeth- acrylate-co-N,N-dimethylaminopropyl- acrylamide) Benzoic Acid Systems

Castillo, L. F. del; Hernandez, C. M.; Huanosta, A.; Ogawa, Thales de Moraes

doi:10.1002/(sici)1097-0126(199606)40:2<87::aid-pi517>3.0.co;2-r

Cited by 2 publications

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“…The properties of the polymer composites in term of relaxation have received attention in part because these properties can show details of the phase structure of these systems and provide information on the interactions between the constituents of the mixture. 5,6 The complex permittivity of the composite depends on the frequency and has a frequency dispersion behavior. In general, to fully characterize these relaxation behaviors requires the use of a special techniques to cover the relevant frequency ranges.…”

Section: Introductionmentioning

confidence: 99%

Study of the relaxation and resonance behaviors of ternary composites: Epoxy–strontium titanate–carbon black

Khouni

Bouzit

2019

Polymers and Polymer Composites

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The principal subject of the present article is the study of the phenomenon of dispersion as well as the effect of the concentration of strontium titanate (SrTiO3) and carbon black on the complex permittivity of ternary composites: epoxy resin–SrTiO3 –black carbon. The relative permittivity of the mixtures as a function of volume fraction of SrTiO3 was modeled by the modified Lichtenecker mixing law (MLL). A new dispersion model, based on the Lorentzian resonance model, has been proposed to describe the frequency behavior of complex permittivity. For these ternary composites, the frequency dispersion behavior of the complex permittivity that exhibits both relaxation and resonance spectra with increasing SrTiO3 concentration has been showed. The new empirical equation proposed in our work has been well describing the complex permittivity of resonance type for the SrTiO3 and carbon black composites. The effects of SrTiO3 content on the electromagnetic properties and absorption characteristics of electromagnetic waves of epoxy resin composites were studied. As the volume fraction of SrTiO3 increases, it was confirmed that the complex permittivity of the composites follows the MLL and the resonant frequency shifted toward the high frequency range. The resonance frequency of the composites was estimated in good agreement with the theoretical values calculated by the second new equation proposed in this article. Complex permittivity is measured using time domain spectroscopy in the frequency range direct current (DC) to 30 GHz.

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Section: Introductionmentioning

confidence: 99%

Study of the relaxation and resonance behaviors of ternary composites: Epoxy–strontium titanate–carbon black

Khouni

Bouzit

2019

Polymers and Polymer Composites

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“…Castillo et al12 prepared a series of polymeric salts of p ‐substituted benzoic acids in poly(methyl methacrylate‐ co ‐ N,N ‐dimethylaminopropylacrylamide), and alternating‐current impedance studies of film‐attached electrodes were carried out. The ionic conductivity was found to be highly dependent on the chemical structure produced by the substituted benzoic group, and high conductivity was obtained when Benzoic acid (BA) was strong.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and modification of aromatic polyesters with chloroacetyl 3,5‐dibromo‐p‐hydroxybenzoic acid

Ozden¹,

Charayev²,

Бажева³

2008

J of Applied Polymer Sci

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Aromatic copolyesters based on diphenylolpropane and 3,5-dibromo-p-hydroxybenzoic acid (p-HBA) were synthesized by an acceptor-catalyzed polycondensation method. During the synthesis, equimolar mixtures of chloranhydrides of isophthalic and terephthalic acids were used. The effects of p-HBA on the tensile and thermal properties of the polyesters were investigated. The breaking stress and modulus of elasticity increased with the amount of p-HBA up to 10% in molar mass. A further increase in p-HBA caused deterioration of the tensile properties. The elongation at break decreased at low p-HBA contents (<5%). The addition of p-HBA increased the molecular packing and the limiting oxygen index and improved the thermal behavior of the synthesized polyesters.

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Dielectric Relaxation Studies on Polymeric Salts: Poly(methylmeth- acrylate-co-N,N-dimethylaminopropyl- acrylamide) Benzoic Acid Systems

Cited by 2 publications

References 0 publications

Study of the relaxation and resonance behaviors of ternary composites: Epoxy–strontium titanate–carbon black

Study of the relaxation and resonance behaviors of ternary composites: Epoxy–strontium titanate–carbon black

Synthesis and modification of aromatic polyesters with chloroacetyl 3,5‐dibromo‐p‐hydroxybenzoic acid

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