Isothermal kinetics of dehydration of equilibrium swollen poly(acrylic acid) hydrogel

被引：13

作者：

Jankovic, B. ^{[1
]}

Adnadevic, B. ^{[1
]}

Jovanovic, J. ^{[1
]}

机构：

[1] Univ Belgrade, Fac Phys Chem, Belgrade 11001, Serbia

来源：

JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY | 2008年 / 92卷 / 03期

关键词：

activation energy; dehydration; isothermal kinetics; poly(acrylic acid) hydrogel;

D O I：

10.1007/s10973-007-7558-1

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

An isothermal dehydration of equilibrium swollen poly(acrylic acid) hydrogel in the temperature range from 306 to 361 K was investigated. The specific parameters connected with shape of the conversion curves were defined. The activation parameters (E, In,4) of the isothermal dehydration of equilibrium swollen poly(acrylic acid) hydrogel were calculated, using Johnson-Mehi-Avrami (JMA), 'initial rate' and 'stationary point' methods. The reaction models for the investigated dehydration are determined using the 'model-fitting' method. It was established that both, the reaction model and activation parameters of the hydrogel dehydration were completely different for the isothermal process than for the non-isothermal one. It was found that the increase in dehydration temperature lead to the changes in isothermal kinetic model for the investigated hydrogel dehydration. It was established that the apparent activation energy (E) of hydrogel dehydration is similar to the value of the molar enthalpy of water evaporation.

引用

页码：821 / 827

页数：7

共 23 条

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