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Influence of starch and glycerol on the properties of chitosan by positron annihilation spectroscopy

✍ Scribed by M. Abd El Wahab; E. S. Abdou

Publisher
John Wiley and Sons
Year
2010
Tongue
English
Weight
574 KB
Volume
116
Category
Article
ISSN
0021-8995

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✦ Synopsis

Abstract

Two types of chitosan (CS), Ξ± and Ξ², were blended with different concentrations of starch and cast to obtain films. The addition of 1% glycerol was used as a plasticizer to increase film flexibility. The properties of the obtained films were studied by positron annihilation lifetime spectroscopy, X‐ray diffraction, and scanning electron microscopy. The results indicate that pure β‐CS had smaller size free‐volume holes with high fractions than pure α‐CS; this was attributed to the difference in bonding of main chains in β‐CS. The addition of starch (>20% up to 50%) reduced the size of the free‐volume holes and increased their fraction because of the close packing of chain segments. The effect of 1% glycerol to the CS starch blends indicated that some modification took place. Β© 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010

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