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Title of Journal: J Therm Anal Calorim

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Abbravation: Journal of Thermal Analysis and Calorimetry

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Springer Netherlands

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1572-8943

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Investigation of thermally stimulated charge relax

Authors: Bhupendra Singh Rathore Mulayam Singh Gaur Kripa Shanker Singh
Publish Date: 2011/05/13
Volume: 107, Issue: 2, Pages: 675-680
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Abstract

The thermally stimulated charge relaxation properties of polycarbonate PC filled with SiO2 nanofiller were studied by means of thermally stimulated discharge current TSDC The nanocomposite samples were further characterized by UV–vis spectroscopy scanning electron microscopy energy dispersive Xray spectra and differential scanning calorimetry DSC techniques to investigate the dispersion of nanofillers in polymer matrix and glass transition temperature All pristine and nanocomposites samples of thickness about 25 μm were prepared using solution mixing method The suitable weight percentage of SiO2 nanofillers has been chosen to prevent the nonuniform dispersion TSDC measurement of PC Pristine and PC+ 7 SiO2 shows the single peak while TSDC characteristic of other nanocomposites are showing two peaks The higher temperature TSDC peak of pristine and nanocomposites samples is originated due to the charge relaxation from shallower and deeper trapping sites however low temperature peak is caused by dipolar relaxation of charge carriers Since the position of higher temperature TSDC peak is generally an analysis of glass transition temperature of polymer/polymer nanocomposites The authors have observed that the temperature of this peak is almost same as the T g measured by DSC with 0 to ±5 variation This article presents the deeper understanding of charge relaxation mechanism caused by SiO2 nanofillers in polycarbonateThe authors gratefully acknowledge the financial support of Inter University Accelerator Center New Delhi India for pursuing of fellowship The authors are thankful to Dr A M Awasthi and Mr S Bhardwaj UGCDAE Indore MP India for providing DSC facility the authors are highly thankful to Prof Ranjit Singh Rani Durgavati University Jabalpur MP India for some useful suggestions

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