Heterogeneity of laser-irradiated films of polyvinyl alcohol/starch blends: effect of glycerol content

Authors

  • P. A. Sreekumar,

    Corresponding author
    1. Department of Chemical and Process Engineering Technology, Jubail Industrial College, Al-Jubail, Kingdom of Saudi Arabia
    • Department of Chemical Engineering, King Fahd University of Petroleum and Minerals, Dhahran, Kingdom of Saudi Arabia
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  • Mamdouh A. Al-Harthi,

    1. Department of Chemical Engineering, King Fahd University of Petroleum and Minerals, Dhahran, Kingdom of Saudi Arabia
    2. Center for Research Excellence in Petroleum Refining and Petrochemicals, King Fahd University of Petroleum and Minerals, Dhahran, Kingdom of Saudi Arabia
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  • M. A. Gondal,

    1. Laser Research Group, Physics Department and Center of Nanotechnology (CENT), King Fahd University of Petroleum and Minerals, Dhahran, Kingdom of Saudi Arabia
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  • S. K. De

    1. Department of Chemical Engineering, King Fahd University of Petroleum and Minerals, Dhahran, Kingdom of Saudi Arabia
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Correspondence to: Sreekumar P.A., Department of Chemical Engineering, King Fahd University of Petroleum and Minerals, P. O. Box 5050, Dhahran 31261, Kingdom of Saudi Arabia.

E-mail: sreekumarpa2008@gmail.com

ABSTRACT

The present paper reports the results of studies on the effect of laser irradiation on the morphology and thermal properties of starch/polyvinyl alcohol (PVA) blend, with varying glycerol concentration. Differential scanning calorimeter results showed that laser irradiation increased the heat of fusion (ΔHfus), heat of crystallization (ΔHcry), temperature of melting (Tm), temperature of crystallization (Tcry) and percentage crystallinity as a function of the amount of glycerol. It is believed that breakdown of the intermolecular hydrogen bonding between the starch and PVA causes an increase in the blend heterogeneity. These results are corroborated with the findings from thermogravimetric analysis and scanning electron microscope images. Copyright © 2013 John Wiley & Sons, Ltd.

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