Description of Water Sorption Isotherms of Natural and Degradable Polymers Using BET and DA Equations

被引：5

作者：

Tomczak, Elwira ^{[1
]}

Kaminski, Wladyslaw ^{[1
]}

机构：

[1] Tech Univ Lodz, Dept Proc Thermodynam, Fac Proc & Environm Engn, PL-90924 Lodz, Poland

来源：

DRYING TECHNOLOGY | 2009年 / 27卷 / 12期

关键词：

Biodegradation; Chitosan; Hydroxypropylcellulose; Isotherms; Polyvinyl alcohol; Starch; MOISTURE SORPTION; THERMODYNAMIC PROPERTIES; DESORPTION ISOTHERMS; ADSORPTION; FOODS; HEAT; FRUITS; GASES;

D O I：

10.1080/07373930903383604

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Sorption isotherms of biodegradable polymers such as chitosan with different degrees of deacetylation, starch, hydroxypropylcellulose, and polyvinyl alcohol were determined experimentally. Tests were performed at constant temperature in static conditions with the application of inorganic saturated salts solutions providing water activities aw from 0.115 to 0.94. Sorption isotherms were described using Brunauer-Emmet-Teller (BET) and Dubinin-Astakhov (DA) equations. Although BET and DA models are commonly used for description of surface adsorption, these two equations were used in this study to describe bulk adsorption. It was shown that the BET model is suitable in the range of water activity when aw0.55, and the DA model is more suitable for aw0.55.

引用

页码：1286 / 1291

页数：6

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