Iterative method to improve calculation of the pre-exponential factor for dynamic thermogravimetric analysis measurements

被引：14

作者：

Gao, ZM

Wang, HX

Nakada, M

机构：

[1] Beijing Inst Technol, Sch Sci, Dept Chem, Beijing 100081, Peoples R China

[2] Chiba Inst Technol, Dept Chem, Chiba 2750023, Japan

来源：

POLYMER | 2006年 / 47卷 / 05期

关键词：

iterative method; pre-exponential factor; isoconversional plot;

D O I：

10.1016/j.polymer.2006.01.053

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 [高分子化学与物理]; 080501 [材料物理与化学]; 081704 [应用化学];

摘要：

The conventional isoconversional plot of ln(beta/T-2) versus 1/T usually has a large error of about - 10% in calculation of the pre-exponential factor as a consequence of assuming h(x) = 1. Iterative calculation using the plot of ln(beta/hT(2)) versus 1/T is thus suggested. It is illustrated that the iterative method can greatly improve calculation for the pre-exponential factor. Success in calculation for the pre-exponential factor is accompanied by an enhanced accuracy in value of activation energy given by the iterative method in comparison with the conventional isoconversional plot of ln(beta/T-2) versus 1/T. One explanation is due to the compensation effect of the Arrhenius parameters. The iterative method has been applied to thermal degradation reactions of poly(methyl methacrylate) (PMMA) and polyethylene. (c) 2006 Elsevier Ltd. All rights reserved.

引用

页码：1590 / 1596

页数：7

共 21 条

[1]

Some methodological problems concerning the kinetic analysis of non-isothermal data for thermal and thermo-oxidative degradation of polymers and polymeric materials [J].