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 language | English |
---|---|
Pages (from-to) | 355-361 |
Journal | Carbohydrate Polymers |
Volume | 50 |
Issue number | 4 |
DOIs | |
Publication status | Published - 2002 |
MoE publication type | A1 Journal article-refereed |
Keywords
- Plasticisation
- water sorption
- glass transition temperature
- stress
- strain