ISO 11358-3:2021 プラスチック—ポリマーの熱重量分析（TG）—パート3：小沢フリードマンプロットを使用した活性化エネルギーの決定と反応速度の分析 | ページ 2

Foreword

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The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, 1. In particular, the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, 2 (see www.iso.org/directives ).

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This document was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 5, Physical-chemical properties.

This second edition cancels and replaces the first edition (ISO 11358-3:2013), which has been technically revised.

The changes compared to the previous edition are as follows:

• the term"conversion" has been deleted;
• a corresponding reference to ISO 11358-2 has been added in Clause 3;
• details of the gas atmosphere in 8.1 and 8.2 have been clarified.

A list of all parts in the ISO 11358 series can be found on the ISO website.

Introduction

The Ozawa-Friedman plot (logarithm of the rate of mass loss versus the reciprocal of absolute temperature at a given mass loss) is a derivative method that can be applied to data obtained by any mode of temperature change in thermal analysis; e.g. isothermal, constant heating rate, sample-controlled thermal analysis, temperature jump, and repeated temperature scanning.

If controlled rate thermogravimetry (CRTG) is used to study the decomposition of polymers, the Ozawa-Friedman method is typically applied to the analysis of data obtained by CRTG and also to that obtained by the combined use of isothermal thermogravimetry (iso−TG) with conventional linear heating rate thermogravimetry (LHTG), i.e. using a constant heating rate.

1 Scope

This document specifies an analysis method for determining the activation energy using the Ozawa-Friedman plot. It also specifies the preparation of master plots for verification of the reaction kinetics determined by thermogravimetry.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 11358-1, ISO 11358-2 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

Bibliography