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vol. 2, nr. 2 (2003)
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Effect of the moisture content of biodegradable plastic obtained by the pressing method on some of its physical properties
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Adam Figiel1, Tomasz Zięba2, Deta Łuczycka1, Ewa Masłyk2
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1 Institute of Agricultural Engineering, University of Agriculture |
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2 Department of Food Storage and Technology, University of Agriculture, ul. Norwida 25, 53-375 Wrocław |
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vol. 2 (2003), nr. 2,
pp. 301-310
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abstract:
nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;A biodegradable artificial material obtained by combining potato starch with ethylene-acrylic acid copolymer was investigated. Water absorption curves were determined for samples of the plastic placed in air at 40ºC temperature and 75% and 95% humidity. The process of water absorption by samples of the biodegradable material from the 75% relative humidity of the air was described with an exponential relation, and with a linear one from 95% air humidity up to a certain critical moisture content where further absorption became exponential. An increase in moisture content of the biodegradable material caused an increase in electric capacity and decreased stress to breaking point.
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keywords:
biodegradable film, starch, absorption, strength, electric capacity
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original in:
English
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