Spectroscopic investigation of onset and enhancement of electrical conductivity in PVC/PANI composites and blends by γ-ray or UV irradiation

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dc.citation.epage3905en_US
dc.citation.issueNumber20en_US
dc.citation.spage3902en_US
dc.citation.volumeNumber102en_US
dc.contributor.authorSevil, U. A.en_US
dc.contributor.authorGüven, O.en_US
dc.contributor.authorSüzer, S.en_US
dc.date.accessioned2016-02-08T10:45:05Z
dc.date.available2016-02-08T10:45:05Z
dc.date.issued1998en_US
dc.departmentDepartment of Chemistryen_US
dc.description.abstractElectrical conductivity of blends and composites of poly(vinyl chloride) (PVC) with nonconducting polyaniline (PANI) increases when they are subjected to γ-rays or UV radiation. This is attributed to a radiation-induced dehydrochlorination (loss of HCl) of PVC, which in turn oxidizes (dopes) PANI within the PVC matrix causing the increase in electrical conductivity of these films. XPS, UV - vis - NIR and FTIR spectroscopic methods are used to characterize and verify this novel process. After the films are subjected to γ-rays (or UV radiation) the intensities in the XPS spectra of both -N+- and Cl- peaks increase, confirming the increase in charged species within the PVC matrix. Similar observations attributable to radiation-induced electrical conductivity are also observed in both the UV - vis - NIR and FTIR spectra. This radiation-induced conductivity can also be reversed to some extent by further exposing the films to NH3 vapors, where the oxidized centers are partially reduced (undoped). Several UV/NH3/UV cycles can be performed without much loss in conductivity- and/or conductivity-related spectroscopic features. The onset of the photoinduced conductivity both in PVC-only and PVC/PANI composite films is determined to be 300 nm (4.1 eV), which coincides with the first UV absorption band of PVC.en_US
dc.description.provenanceMade available in DSpace on 2016-02-08T10:45:05Z (GMT). No. of bitstreams: 1 bilkent-research-paper.pdf: 70227 bytes, checksum: 26e812c6f5156f83f0e77b261a471b5a (MD5) Previous issue date: 1998en
dc.identifier.doi10.1021/jp980369zen_US
dc.identifier.issn1089-5647
dc.identifier.urihttp://hdl.handle.net/11693/25457
dc.language.isoEnglishen_US
dc.publisherAmerican Chemical Societyen_US
dc.relation.isversionofhttps://doi.org/10.1021/jp980369zen_US
dc.source.titleJournal of Physical Chemistry Ben_US
dc.subjectAmmoniaen_US
dc.subjectComposite materialsen_US
dc.subjectElectric conductivityen_US
dc.subjectFourier transform infrared spectroscopyen_US
dc.subjectGamma raysen_US
dc.subjectLight absorptionen_US
dc.subjectOxidationen_US
dc.subjectPolymer blendsen_US
dc.subjectPolyvinyl chloridesen_US
dc.subjectUltraviolet radiationen_US
dc.subjectX ray photoelectron spectroscopyen_US
dc.subjectDehydrochlorinationen_US
dc.subjectPolyanilineen_US
dc.subjectConductive plasticsen_US
dc.titleSpectroscopic investigation of onset and enhancement of electrical conductivity in PVC/PANI composites and blends by γ-ray or UV irradiationen_US
dc.typeArticleen_US

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