Thermal degradation of polystyrene in the presence of hydrogen by catalyst in solution

被引:34
作者
Balakrishnan, Rahul Kumar [1 ]
Guria, Chandan [1 ]
机构
[1] Birla Inst Technol, Dept Polymer Engn, Ranchi 835215, Bihar, India
关键词
degradation kinetics; polystyrene; random scission; hydrogen; catalyst;
D O I
10.1016/j.polymdegradstab.2007.04.014
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
For the first time, low temperature degradation (170-240 degrees C) of polystyrene in benzene is carried out in the presence of hydrogen using iron(III) oxide catalyst. The effect of temperature, catalyst loading and polymer loading on degradation are studied in hydrogen atmosphere. Degradation is also carried out at different initial hydrogen partial pressure. The time dependent molecular weight is calculated using viscosity average method. It is found that the degradation is enhanced considerably in the presence of hydrogen and followed random degradation chain scission. A random degradation kinetic model of Kelen [Kelen T. Polymer degradation. New York: Van Nostrand Reinhold Company; 1983.] is used to estimate the degradation rate constants. Empirical correlations are proposed to account for the effect of catalyst loading and initial hydrogen partial pressure on degradation. The true thermal degradation rate constants are calculated using these proposed correlations at given catalyst loading and initial hydrogen partial pressure with varying temperature. The frequency factor and activation energy are also determined using Arrhenius equation considering the true thermal degradation rate constants. (c) 2007 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1583 / 1591
页数:9
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