ISO 11358-3:2021

Name: ISO 11358-3:2021 — Plastics — Thermogravimetry (TG) of polymers — Part 3: Determination of the activation energy using the Ozawa-Friedman plot and analysis of the reaction kinetics
SKU: ISO 11358-3:2021
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Plastics — Thermogravimetry (TG) of polymers — Part 3: Determination of the activation energy using the Ozawa-Friedman plot and analysis of the reaction kinetics

Название (английский):

ISO 11358-3:2021

Plastics — Thermogravimetry (TG) of polymers — Part 3: Determination of the activation energy using the Ozawa-Friedman plot and analysis of the reaction kinetics

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 14
Дата публикации:: 29 января 2021 г.
Издание:: ISO IS 11358 edition 2 version 1
ICS:: 83.080.01

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Описание (английский):

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.

Abstract

Overview

Key topics and requirements

Activation energy determination: Uses the Ozawa‑Friedman method - plot of ln(rate of conversion) versus reciprocal absolute temperature (1/T); slope yields activation energy (–Ea/R).
Rate of conversion (dC/dt): Measurement and calculation of conversion rate at fixed conversion levels are required for the Ozawa‑Friedman analysis.
Master curves / master plots: Preparation of conversion vs generalized time or generalized rate plots to verify kinetic models and reaction mechanisms (g(α), f(α)).
Test conditions:
- Typical specimen mass: 1 mg to 10 mg.
- Recommended linear heating rates: 2 K·min⁻¹ to 10 K·min⁻¹.
- Use of CRTG (sample mass controlled rate thermogravimetry), LHTG (linear heating rate TG), and isothermal TG data.
Atmospheres: Differentiates non‑oxidative and oxidative reaction procedures - atmospheres specified by ISO 11358‑2.
Apparatus and calibration: References ISO 11358‑1 for TG apparatus requirements and mass/temperature calibration procedures.
Reporting and precision: Graphical presentation (Ozawa‑Friedman plots), tabulated activation energies at different conversion levels, and test report content are specified; mathematical background included in an informative annex.

Practical applications

Characterizing thermal stability and decomposition kinetics of polymers and additives.
Comparing activation energies to evaluate flame retardants, stabilizers or recycling feedstock behavior.
Supporting lifetime prediction, accelerated aging studies and process design (e.g., extrusion, thermal processing).
Validating kinetic models used in simulation of decomposition or combustion in R&D and failure analysis.

Who uses this standard

Polymer scientists and thermal analysis laboratories performing thermogravimetry (TG/TGA).
R&D teams in plastics, composites, coatings and additive manufacturers.
Quality assurance, regulatory compliance, and materials selection engineers assessing thermal performance.
Academic researchers studying polymer reaction kinetics and degradation mechanisms.

Related standards

ISO 11358‑1 - TG apparatus, general principles, calibration.
ISO 11358‑2 - Determination of activation energy; gas atmosphere specifications for oxidative/non‑oxidative tests.

Keywords: ISO 11358-3, thermogravimetry, Ozawa-Friedman plot, activation energy, polymer kinetics, TGA, master curves, CRTG, LHTG.