Plasticization of barley starch with glycerol and water

P. Forssell; J. Mikkilä; T. Suortti; J. Seppälä; K. Poutanen

doi:10.1080/10601329608010888

Plasticization of barley starch with glycerol and water

P. Forssell^*, J. Mikkilä, T. Suortti, J. Seppälä, K. Poutanen

^*Corresponding author for this work

VTT Technical Research Centre of Finland

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Abstract

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 language	English
Pages (from-to)	703-715
Number of pages	13
Journal	Journal of Macromolecular Science Part A: Pure and Applied Chemistry
Volume	33
Issue number	5
DOIs	https://doi.org/10.1080/10601329608010888
Publication status	Published - 1996
MoE publication type	A1 Journal article-refereed

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title = "Plasticization of barley starch with glycerol and water",

abstract = "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.",

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AU - Forssell, P.

AU - Mikkilä, J.

AU - Suortti, T.

AU - Seppälä, J.

AU - Poutanen, K.

PY - 1996

Y1 - 1996

N2 - 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.

AB - 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.

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Plasticization of barley starch with glycerol and water

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