Synthesis, characterization and a.c. conductivity of polypyrrole/Y2O3 composites

Bulletin of materials science

T K Vishnuvardhan²  S C Raghavendra³  C Basavaraja²  V R Kulkarni¹ 

[1] Department of Chemistry, Gulbarga University, Gulbarga 585 106, India$$Department of Electrical and Computer Engineering, University Federal of Para, P O Box 8619, CEP 66075-900, Belem, Brazil$$Department of Chemistry, Gulbarga University, Gulbarga 585 106, IndiaDepartment of Chemistry, Gulbarga University, Gulbarga 585 106, India$$Department of Electrical and Computer Engineering, University Federal of Para, P O Box 8619, CEP 66075-900, Belem, Brazil$$Department of Electrical and Computer Engineering, University Federal of Para, P O Box 8619, CEP 66075-900, Belem, BrazilDepartment of Chemistry, Gulbarga University, Gulbarga 585 106, India$$Department of Electrical and Computer Engineering, University Federal of Para, P O Box 8619, CEP 66075-900, Belem, Brazil$$;Department of Chemistry, Gulbarga University, Gulbarga 585 106, India$$Department of Chemistry, Gulbarga University, Gulbarga 585 106, IndiaDepartment of Chemistry, Gulbarga University, Gulbarga 585 106, India$$;Department of Electrical and Computer Engineering, University Federal of Para, P O Box 8619, CEP 66075-900, Belem, Brazil$$Department of Electrical and Computer Engineering, University Federal of Para, P O Box 8619, CEP 66075-900, Belem, BrazilDepartment of Electrical and Computer Engineering, University Federal of Para, P O Box 8619, CEP 66075-900, Belem, Brazil$$

关键词: Composites;    polypyrrole;    conductivity;    spectroscopy.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

Conducting polymer composites of polypyrrole/yttrium oxide (PPy/Y₂O₃) were synthesized by in situ polymerization of pyrrole with Y₂O₃ using FeCl₃ as an oxidant. The Y₂O₃ is varied in five different weight percentages of PPy in PPy/Y₂O₃ composites. The synthesized polymer composites are characterized by infrared and X-ray diffraction techniques. The surface morphology of the composite is studied by scanning electron microscopy. The glass transition temperature of the polymer and its composite is discussed by DSC. Electrical conductivity of the compressed pellets depends on the concentration of Y₂O₃ in PPy. The frequency dependent a.c. conductivity reveals that the Y₂O₃ concentration in PPy is responsible for the variation of conductivity of the composites. Frequency dependent dielectric constant at room temperature for different composites are due to interfacial space charge (Maxwell Wagner) polarization leading to the large value of dielectric constant. Frequency dependent dielectric loss, as well as variation of dielectric loss as a function of mass percentage of Y₂O₃ is also presented and discussed.

【 授权许可】

Unknown