ISO 6721-11:2019

Plastics — Determination of dynamic mechanical properties — Part 11: Glass transition temperature

This document specifies methods for determining a value of the glass transition temperature (Tg) from the dynamic mechanical properties measured during a linear temperature scan under heating conditions. The glass transition temperature is an indicator of the transition from a hard and relatively brittle glassy state to a rubbery or viscous liquid state in an amorphous polymer or in amorphous regions of a partially crystalline polymer. Usually referred to as dynamic mechanical analysis (DMA), the methods and their associated procedures can be applied to unreinforced and filled polymers, foams, rubbers, adhesives and fibre-reinforced plastics/composites. The methods are limited to materials that are inherently stable above Tg, i.e. amorphous materials that transform into a rubbery state or partially crystalline materials that keep their shape due to crystallinity. Different modes (e.g. flexure, torsion, shear, compression, tension) of dynamic mechanical analysis can be applied, as appropriate, to the form of the source material. Measured Tg values using instrumentation can vary as a result of material characteristics and/or the test set-up. The temperature sensor in a DMA instrument is not in contact with the test specimen and therefore measures temperature of the environment surrounding the specimen under test. The resulting data can vary with the heating rate applied. A procedure is included to take into account the thermal lag influencing the measured data.

Plastiques — Détermination des propriétés mécaniques dynamiques — Partie 11: Température de transition vitreuse

General Information

• Status: Published
• Publication Date: 28-May-2019
• ICS: 83.080.01 - Plastics in general
• Technical Committee: ISO/TC 61/SC 5 - Physical-chemical properties
• Drafting Committee: ISO/TC 61/SC 5/WG 8 - Thermal analysis
• Current Stage: 9020 - International Standard under periodical review
• Start Date: 15-Jan-2024
• Completion Date: 15-Jan-2024

Relations

• Revises: ISO 6721-11:2012 - Plastics — Determination of dynamic mechanical properties — Part 11: Glass transition temperature
• Effective Date: 15-Dec-2017

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 6721-11
Second edition
2019-06
Plastics — Determination of dynamic
mechanical properties —
Part 11:
Glass transition temperature
Plastiques — Détermination des propriétés mécaniques
dynamiques —
Partie 11: Température de transition vitreuse
Reference number
ISO 6721-11:2019(E)
©
ISO 2019

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ISO 6721-11:2019(E)

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ii © ISO 2019 – All rights reserved

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ISO 6721-11:2019(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Apparatus . 3
5.1 Test equipment . 3
5.2 Devices for measuring test specimen dimensions . 3
6 Test specimen . 3
6.1 General . 3
6.2 Shape and dimensions . 3
6.3 Preparation . 4
7 Number of specimens . 4
8 Conditioning . 4
9 Test procedure . 4
9.1 Test atmosphere . 4
9.2 Operation .
...