PHYSICAL AND MECHANICAL-PROPERTIES OF HIGHLY PLASTICIZED PECTIN STARCH FILMS

被引:81
|
作者
COFFIN, DR
FISHMAN, ML
机构
[1] U. S. Department of Agriculture, Agricultural Research Service, Eastern Regional Research Center, Philadelphia, Pennsylvania, 19118
关键词
Glycerine concentration - Highly plasticized citrus pectin/amylose starch films - Oxygen permeability - Rheometrics RSA II solids analyzer;
D O I
10.1002/app.1994.070540913
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Blends of citrus pectin and high amylose starch plasticized with glycerine were investigated to determine the effect of compositional variables on film properties. Several films with representative compositions were made from sugar beet and almond pectin, and tested for comparison. The films were cast from water onto glass plates, dried, and removed. Mechanical analysis was done using a Rheometrics RSA II solids analyzer. Increasing the glycerine concentration led to decreases in static modulus, dynamic modulus, and tensile strength, but to increases in elongation. Increasing levels of starch in the blend lowered the effect of glycerine on mechanical properties. Oxygen permeability of the films was extremely low. Sugar-beet pectin and almond pectin gave films with mechanical properties comparable to those made with citrus pectin. (C) 1994 John Wiley & Sons, Inc.
引用
收藏
页码:1311 / 1320
页数:10
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