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

被引：51

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

页码：101 / 109

页数：9

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