Effect of glycerol on behaviour of amylose and amylopectin films

Päivi Myllärinen (Corresponding Author), Riitta Partanen, Jukka Seppälä, Pirkko Forssell

Research output: Contribution to journalArticleScientificpeer-review

206 Citations (Scopus)

Abstract

The effect of water and glycerol on sorption and calorimetric Tgs of amylose and amylopectin films were examined. The mechanical properties of the films were also analysed under varying glycerol content at constant RH and temperature. Based on changes observed in sorption and tensile failure behaviour glycerol was strongly interacted with both starch polymers. Even though water was observed to be more efficient plasticiser than glycerol, glycerol also affected the Tg. But in spite of the observed decrease in Tg under low glycerol contents brittleness of the films increased based on changes in elongation. The increase in brittleness of both polymers was also in agreement with their actual behaviour. At around 20% glycerol great change in the rheological properties occurred. Above 20% glycerol amylose film showed much larger elongation than the low glycerol content films and was still strong but the amylopectin produced a very week and non-flexible film.
Original languageEnglish
Pages (from-to)355-361
JournalCarbohydrate Polymers
Volume50
Issue number4
DOIs
Publication statusPublished - 2002
MoE publication typeA1 Journal article-refereed

Keywords

  • Plasticisation
  • water sorption
  • glass transition temperature
  • stress
  • strain

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