Desiccant effect of starch in polylactic acid composites

Research output: Contribution to journalArticle

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.

Original languageEnglish
Pages (from-to)1014-1024
Number of pages11
JournalExpress Polymer Letters
Volume12
Issue number11
DOIs
Publication statusPublished - Nov 1 2018

Fingerprint

Hygroscopic Agents
desiccants
starches
Starch
glycerols
Glycerol
acids
composite materials
Acids
Composite materials
packaging
humidity
Water
Atmospheric humidity
water
Packaging materials
poly(lactic acid)
containers
Containers
stiffness

Keywords

  • Biocomposites
  • Biopolimers
  • Desiccant
  • Polylactic acid
  • Thermoplastic starch

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

Cite this

Desiccant effect of starch in polylactic acid composites. / Móczó, J.; Kun, D.; Fekete, E.

In: Express Polymer Letters, Vol. 12, No. 11, 01.11.2018, p. 1014-1024.

Research output: Contribution to journalArticle

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