ISO 11358-2:2021 PDF

Plastics — Thermogravimetry (TG) of polymers — Part 2: Determination of activation energy

Название (английский):

ISO 11358-2:2021

Plastics — Thermogravimetry (TG) of polymers — Part 2: Determination of activation energy

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 6
Дата публикации:: 29 января 2021 г.
Издание:: ISO IS 11358 edition 3 version 1
ICS:: 83.080.01

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Описание (английский):

This document specifies a method for the determination of the activation energy, Ea, in the Arrhenius formula for the decomposition of polymers using a thermogravimetric technique. The method is applicable only if the reaction proceeds by a single mechanism. It is applicable to multistage reactions if they consist of clearly separated single-stage steps.

Технические детали

Технический комитет: ISO/TC 61/SC 5 - Physical-chemical properties
SKU: ISO 11358-2:2021

Abstract

Overview

ISO 11358-2:2021 - "Plastics - Thermogravimetry (TG) of polymers - Part 2: Determination of activation energy" specifies a standardized thermogravimetric (TG) method to determine the activation energy (Ea) for polymer decomposition using thermogravimetric analysis (TGA). The method uses multiple dynamic heating-rate TG runs to derive Ea from the temperature dependence of decomposition according to the Arrhenius relationship. It applies only when the decomposition proceeds by a single mechanism or by clearly separated single-stage steps in a multistage reaction.

Key Topics

Principle: heating specimens at several heating rates, measuring mass change vs temperature, selecting temperatures at given degrees of conversion (C), and calculating Ea from the slope of log(heating rate) vs 1/T plots using the Ozawa / Flynn–Wall approximation.
Test conditions and apparatus: refers to ISO 11358-1 for general TG principles, apparatus requirements, and calibration (mass and temperature).
Specimen preparation: powders, pellets, flakes, filaments or film; small particle size preferred (grinding in liquid-nitrogen mill acceptable).
Experimental parameters:
- Use three or more heating rates; lowest and highest heating rates must differ by a factor ≥ 5.
- Preferred specimen mass

Overview

Key Topics

Principle: heating specimens at several heating rates, measuring mass change vs temperature, selecting temperatures at given degrees of conversion (C), and calculating Ea from the slope of log(heating rate) vs 1/T plots using the Ozawa / Flynn–Wall approximation.
Test conditions and apparatus: refers to ISO 11358-1 for general TG principles, apparatus requirements, and calibration (mass and temperature).
Specimen preparation: powders, pellets, flakes, filaments or film; small particle size preferred (grinding in liquid-nitrogen mill acceptable).
Experimental parameters:
- Use three or more heating rates; lowest and highest heating rates must differ by a factor ≥ 5.
- Preferred specimen mass

ISO 11358-2:2021 PDF

Технические детали

Abstract

Overview

Key Topics

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Abstract

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