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Dielectric relaxation and electric modulus behavior in poly(vinyl alcohol)-based composite systems
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1996
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Optical MaterialsEngineeringMechanical EngineeringChemistryElectric Modulus BehaviorVinyl AlcoholConducting PolymerPolymer MaterialPolymer TechnologyHybrid MaterialsPolymer ChemistryMaterials ScienceElectroactive MaterialPure PvaLead AcetateElectrical InsulationPolymer AnalysisPolymer ScienceApplied PhysicsMaterials CharacterizationPolymer PropertyDielectric RelaxationSolar Cell Materials
The ultraviolet spectra of pure and lead salt-poly(vinyl alcohol) (PVA) composite films were studied at room temperature. Blending of PVA with lead acetate and lead nitrate cause a considerable change in the UV spectrum, indicating electronic structure modifications. The complex permittivity (ϵ*) and the complex electric modulus (M*) of the pure PVA and the PVA–based composite films were investigated between 300 and 400 K in the 100 Hz-100 kHz frequency range. The frequency dependence of the permittivity is influenced by the space-charge polarization. The interfacial polarization is manifested at high temperature and becomes important only above the PVA glass transition temperature and below 1 kHz. Dielectric properties of PVA–lead nitrate composite revealed that the salt is complexed with PVA through hydrogen bonding. © 1996 John Wiley & Sons, Inc.