Plasticization of barley starch with glycerol and water

被引：45

作者：

Forssell, P ^{[1
]}

Mikkila, J ^{[1
]}

Suortti, T ^{[1
]}

Seppala, J ^{[1
]}

Poutanen, K ^{[1
]}

机构：

[1] HELSINKI UNIV TECHNOL, LAB POLYMER TECHNOL, FIN-02150 ESPOO, FINLAND

来源：

JOURNAL OF MACROMOLECULAR SCIENCE-PURE AND APPLIED CHEMISTRY | 1996年 / A33卷 / 05期

关键词：

D O I：

10.1080/10601329608010888

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

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 degrees 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 degrees C.

引用

页码：703 / 715

页数：13

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