Kinetic study of the thermal decomposition of poly(vinyl alcohol)/kraft lignin derivative blends

被引：50
|
作者：
Fernandes, DM [1 ]
Hechenleitner, AAW [1 ]
Pineda, EAG [1 ]
机构：
[1] Univ Estadual Maringa, Dept Quim, BR-87020900 Maringa, Parana, Brazil
来源：
THERMOCHIMICA ACTA | 2006年 / 441卷 / 01期
关键词：
poly(vinyl alcohol); kraft lignin; TGA-FT-IR; dynamic isoconversional kinetics;
D O I：
10.1016/j.tca.2005.11.006
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
A kraft lignin derivative (KLD) obtained by reaction with p-aminobenzoic acid/phthalic anhydride, was blended with poly(vinyl alcohol) (PVA) by solution casting from DMSO. PVA and PVA/KLD films were exposed to ultraviolet radiation (Hg lamp, 96 h) and analyzed by thermogravimetry (TG) in inert and oxidative atmosphere. Typical multi-step decomposition profiles were obtained. The apparent activation energy (E-a) of the thermal degradation of the samples was computed by the Vyazovkin method. The KLD degradation presented only small intervals of decomposition degree with constant E-a values. PVA and blends showed intervals of up to 50% in decomposition degree with nearly constant E-a, and smaller intervals in which E-a varies drastically. The influences of samples irradiation and of surrounding gas in TG analysis on E-a are also shown. (C) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码：101 / 109
页数：9
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