Water sorption and mechanical properties of cassava starch films and their relation to plasticizing effect

被引：491

作者：

Mali, S ^{[1
]}

Sakanaka, LS ^{[1
]}

Yamashita, F ^{[1
]}

Grossmann, MVE ^{[1
]}

机构：

[1] Univ Estadual Londrina, Dept Tecnol Alimentos & Medicamentos, Ctr Ciencias Agrarias, BR-86051990 Londrina, PR, Brazil

来源：

CARBOHYDRATE POLYMERS | 2005年 / 60卷 / 03期

关键词：

biodegradable films; glycerol and sorbitol;

D O I：

10.1016/j.carbpol.2005.01.003

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Effects of plasticizers (glycerol, sorbitol, and 1:1 mixture of glycerol and sorbitol) on moisture sorption characteristics of cassava starch films were investigated at three levels of plasticizer concentration (0, 20, and 40 g/100 g starch). The combined effects of relative humidity and plasticizer on mechanical properties of starch films were also examined. Water affinities of cassava starch films were affected by hydrophilicity of the plasticizer and its concentration. Films plasticized with glycerol, under all RH conditions, adsorbed more moisture with higher initial adsorption rate, and films with higher plasticizers contents exhibited higher equilibrium moisture contents. Mechanical properties were affected by plasticizing effect, including the water adsorbed, resulting in higher strain and Young's modulus values for starch films and, in all cases, glycerol exerted a more effective plasticization. (c) 2005 Elsevier Ltd. All rights reserved.

引用

页码：283 / 289

页数：7