Irradiation effects on transport properties of polyaniline and polyaniline/bentonite composite

Autor: Tahir Tilki, Duygu Takanoğlu, Mehmet Cabuk, Abdullah Kaplan, O. Karabulut, Mustafa Yavuz
Rok vydání: 2012
Předmět:
Peak position
Thermogravimetric analysis
Materials science
Polymers
XRD
Polyaniline
Conductivity
Electron transport properties
Degradation
chemistry.chemical_compound
Conduction Mechanism
Temperature range
Electric conductivity
Electrical resistivity and conductivity
Amorphous regions
Electrical conductivity
Degradation temperatures
Irradiation process
General Materials Science
Irradiation effects
Irradiation
Thermogravimetric measurement
Composite material
Radiation
Aniline polymerization
Irradiated samples
Bant structure
Polymer chains
Atmospheric temperature range
Condensed Matter Physics
Amorphous solid
Temperature-dependent conductivity
Polymer structure
chemistry
Chemical engineering
Polymerization
Transport properties
Temperature dependent
XRD patterns
Irradiation effect
Localized state
Zdroj: Materials Chemistry and Physics. 135:563-568
ISSN: 0254-0584
DOI: 10.1016/j.matchemphys.2012.05.026
Popis: In this study, the effects of irradiation on pure polyaniline and polyaniline/bentonite composites synthesized chemically were investigated by means of thermogravimetric measurements, UV, SEM, XRD, absorption and temperature dependent electrical conductivity in the temperature range of 85-400 K. The irradiation process was carried out in air in a conventional gamma chamber, which uses a 60Co source and the samples were exposed to dose 40 kGy. The initial decomposition and first degradation temperatures of PAni/Bnt and Irradiated PAni/Bnt composites obtained from thermogravimetric measurements were higher than those of PAni and irradiated PAni. This could have been caused by the treatment with bentonite during aniline polymerization. The XRD patterns revealed that the peak positions of the as-prepared and irradiated samples were the same but the intensities of the peaks decreased with irradiation due to breaking of the polymer chain, which induces more amorphous regions in the polymer structure. It was found from temperature dependent conductivity measurements that the radiation significantly influenced the conductivity of PAni and PAni/Bnt composites. The conductivity results show that the dominant conduction mechanisms were hopping for all samples due to wide range of localized states present near the Fermi level. © 2012 Elsevier B.V. All rights reserved. Firat University Scientific Research Projects Management Unit: 2224-D-10 The authors thanks to SDU-BAP (The Scientific Research Projects of Suleyman Demirel University) for the financial support of this work (Project No: 2224-D-10).
Databáze: OpenAIRE
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