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KMID : 1134819990280020423
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Journal of the Korean Society of Food Science and Nutrition
1999 Volume.28 No. 2 p.423 ~ p.428
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Mechanical Properties of Polyethylene Films Containing Hydroxypropylated Potato Starch
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Lee Sun-Ja
Kim Mee-Ra
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Abstract
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Potato starches were hydroxypropylated with 2.5, 5.0, 7.5, and 10.0% propylene oxide(PO) to improve mechanical properties of starch-polyethylene film. Starch-polyethylene cast films were prepared that contained 5% or 10% of the hydroxypropylated potato starch. Mechanical properties of these films were measured and compared to those of the films containing native potato starch. DS(degree of substitution) increased proportionally as propylene oxide concentration increased. Relative crystallinity in X-ray diffraction patterns was decreased and starch granule observed by scanning electron microscopy was destroyed by severe hydroxypropylation. In color properties of films, b value was not significantly different in the films but 5% starch-polyethylene films with 2.5 PO starch showed the lowest L and a value. Tensile strength and strain energy of the films except the film containing 10.0 PO starch were higher than those of the containing native starch.
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KEYWORD
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potato starch, hydroxypropylation, starch-polyethylene film, mechanical property
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