Plasticization of barley starch with glycerol and water

Pirkko Forssell, Jaana Mikkilä, Tapani Suortti, Jukka Seppälä, Kaisa Poutanen

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    68 Citations (Scopus)


    Barley starch was plasticized in a melt mixer using glycerol and water as plasticizers. Plasticizer concentration, time, temperature, and shear were varied, and their effects on the molecular weight of starch and the glass transition temperature and mechanical properties of the mixtures were studied. Depolymerization of amylopectin was observed in all experiments, and starch degradation proceeded further at low glycerol concentrations. The glass transition of the plasticized starch-glycerol mixtures occurred in the temperature range −50 to −100°C and was probably induced by glycerol, not by starch. The tensile strength of a starch plate containing 29 wt% glycerol was about 0.5 MPa 1 week after molding, but increased to 2–3 MPa during 5 weeks of storage at 50% relative humidity and 24°C.
    Original languageEnglish
    Pages (from-to)703-715
    Number of pages13
    JournalJournal of Macromolecular Science: Pure and Applied Chemistry
    Issue number5
    Publication statusPublished - 1996
    MoE publication typeA1 Journal article-refereed


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