Micro-Structure, Ac Conductivity and Spectroscopic Studies of Cupric Sulphate Doped PVA/PVP Polymer Composites

K Hemalatha,H Somashekarappa,R Somashekar

doi:10.4236/ampc.2015.510041

K Hemalatha, H Somashekarappa + Show 1 more

Open Access

https://doi.org/10.4236/ampc.2015.510041

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Abstract

A series of polyvinyl alcohol/polyvinyl pyrrolidone polymer composite films doped with different amount of cupric sulphate (CuSO4) were prepared by means of solution casting technique. These films were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Ultraviolet-Visible absorbance spectroscopy (UV-Vis) and Ac conductivity measurement studies. XRD patterns of these films recorded at room temperature show the increase in amorphousity of the matrix with the increase in the concentration of CuSO4 in polymer composites. Microstructural parameters were computed using an in-house program employing XRD data. Recorded FT-IR spectra give information about the stretching and bending of the characteristic absorption bands in these films. The variation in the transmittance has been studied with the help of recorded UV-Vis spectra and hence the optical band gap present in the samples is also calculated. The measured Ac conductivity shows how the conductivity varies in these films with the presence of different amount of CuSO4 in these films.

Highlights

Extensive investigations on conductive polymers have been taken place in recent years in view of their important applications in electronic, electrochemical and optical devices [1] [2]
Polyvinyl alcohol is a well-known semicrystalline, water-soluble and biodegradable polymer used in practical applications because of its easy preparation, excellent chemical resistance and physical properties [10]-[12]
The cupric sulphate was added to the 50/50 (PVA/polyvinyl pyrrolidone (PVP)) stock solution with different weight concentrations of 0.2%, 0.4%, 0.6%, 0.8% and 1.0%, stirred at room temperature using magnetic stirrer for half an hour to get more homogeneous solution and the solution was poured into petri dish placed on flat surface and allowed to dry completely at room temperature

Summary

Introduction

Extensive investigations on conductive polymers have been taken place in recent years in view of their important applications in electronic, electrochemical and optical devices [1] [2]. Polyvinyl alcohol is a well-known semicrystalline, water-soluble and biodegradable polymer used in practical applications because of its easy preparation, excellent chemical resistance and physical properties [10]-[12]. It has a carbon chain backbone with hydroxyl groups attached to methane carbons. These OH-groups providing the bridging between adjacent chains lead to photoluminescence, mechanical strength and endure various dopings Due to this property, the polymer allows homogeneous dispersion and good environmental stability to embedded metal particles [13] [14]

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