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Heterogeneity of laser‐irradiated films of polyvinyl alcohol/starch blends: effect of glycerol content
Author(s) -
Sreekumar P. A.,
AlHarthi Mamdouh A.,
Gondal M. A.,
De S. K.
Publication year - 2013
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.5211
Subject(s) - polyvinyl alcohol , crystallinity , crystallization , differential scanning calorimetry , glycerol , starch , thermogravimetric analysis , scanning electron microscope , materials science , chemical engineering , irradiation , polymer chemistry , vinyl alcohol , composite material , chemistry , organic chemistry , polymer , physics , nuclear physics , engineering , thermodynamics
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 (ΔH fus ), heat of crystallization (ΔH cry ), temperature of melting (T m ), temperature of crystallization (T cry ) 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.