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Desiccant effect of starch in polylactic acid composites

Móczó, János and Kun, Dávid and Bódiné Fekete, Erika (2018) Desiccant effect of starch in polylactic acid composites. Express Polymer Letters, 12 (11). pp. 1014-1024. ISSN 1788-618X

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Abstract

Polylactic acid (PLA)/starch and PLA/starch-glycerol composites with different glycerol contents were prepared in a wide composition range, in order to study their applicability as packaging materials for dry products. Water uptake was determined at a temperature of 23 °C and different relative humidities. Structure and mechanical properties were also investigated. PLA/ unplasticized starch composites could absorb a considerable amount of water. As a result, they may be adequate as a biodegradable inner container in dry packaging. The absorption capacity of the composites increased significantly with increasing starch content and relative humidity, respectively. Unplasticized starch exhibited not only a desiccant but also a reinforcing effect in PLA, thus both stiffness and strength increased with increasing starch loading. The influence of glycerol content on the water uptake was difficult to reveal due to the migration of glycerol from the bulk to the surface. Furthermore, glycerol weakened the PLA/starch adhesion and softened starch particles.

Item Type: Article
Subjects: Q Science / természettudomány > Q1 Science (General) / természettudomány általában
Q Science / természettudomány > QD Chemistry / kémia
T Technology / alkalmazott, műszaki tudományok > T2 Technology (General) / műszaki tudományok általában
Depositing User: Dr. János/J Móczó
Date Deposited: 07 Sep 2018 11:34
Last Modified: 07 Sep 2018 11:34
URI: http://real.mtak.hu/id/eprint/83230

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