ISO 11358-2:2021
(Main)Plastics — Thermogravimetry (TG) of polymers — Part 2: Determination of activation energy
Plastics — Thermogravimetry (TG) of polymers — Part 2: Determination of activation energy
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.
Plastiques — Thermogravimétrie (TG) des polymères — Partie 2: Détermination de l'énergie d'activation
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INTERNATIONAL ISO
STANDARD 11358-2
Third edition
2021-01
Plastics — Thermogravimetry (TG) of
polymers —
Part 2:
Determination of activation energy
Plastiques — Thermogravimétrie (TG) des polymères —
Partie 2: Détermination de l'énergie d'activation
Reference number
ISO 11358-2:2021(E)
©
ISO 2021
---------------------- Page: 1 ----------------------
ISO 11358-2:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 11358-2:2021(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Apparatus . 2
6 Mass and temperature calibration . 2
6.1 Mass calibration . 2
6.2 Temperature calibration . 2
7 Test specimens. 2
8 Procedure. 3
8.1 General . 3
8.2 Non-oxidative reactions . 3
8.3 Oxidative reactions . 3
9 Expression of results . 3
9.1 Graphical presentation . 3
9.2 Determination of activation energy . 3
10 Precision . 5
11 Test report . 5
Bibliography . 6
© ISO 2021 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 11358-2:2021(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 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, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 5, Physical-
chemical properties.
This third edition cancels and replaces the second edition (ISO 11358-2:2014), which has been
technically revised.
The main changes compared to the previous edition are as follows:
— the designation of rate of conversion has been changed in order to match that used in ISO 11358-3;
— the purge gas requirements have been changed with a reference to ISO 11358-1.
A list of all parts in the ISO 11358 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2021 – All rights reserved
---------------------- Page: 4 ----------------------
INTERNATIONAL STANDARD ISO 11358-2:2021(E)
Plastics — Thermogravimetry (TG) of polymers —
Part 2:
Determination of activation energy
1 Scope
This document specifies a method for the determination of the activation energy, E , in the Arrhenius
a
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.
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.
ISO 1135
...
FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 11358-2
ISO/TC 61/SC 5
Plastics — Thermogravimetry (TG) of
Secretariat: DIN
polymers —
Voting begins on:
2020-10-30
Part 2:
Voting terminates on:
Determination of activation energy
2020-12-25
Plastiques — Thermogravimétrie (TG) des polymères —
Partie 2: Détermination de l'énergie d'activation
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 11358-2:2020(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
©
NATIONAL REGULATIONS. ISO 2020
---------------------- Page: 1 ----------------------
ISO/FDIS 11358-2:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/FDIS 11358-2:2020(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Apparatus . 2
6 Mass and temperature calibration . 2
6.1 Mass calibration . 2
6.2 Temperature calibration . 2
7 Test specimens. 2
8 Procedure. 3
8.1 General . 3
8.2 Non-oxidative reactions . 3
8.3 Oxidative reactions . 3
9 Expression of results . 3
9.1 Graphical presentation . 3
9.2 Determination of activation energy . 3
10 Precision . 5
11 Test report . 5
Bibliography . 6
© ISO 2020 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO/FDIS 11358-2:2020(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 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, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 5, Physical-
chemical properties.
This third edition cancels and replaces the second edition (ISO 11358-2:2014), which has been
technically revised.
The main changes compared to the previous edition are as follows:
— the designation of rate of conversion has been changed in order to match that used in ISO 11358-3;
— the purge gas requirements have been changed with a reference to ISO 11358-1.
A list of all parts in the ISO 11358 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2020 – All rights reserved
---------------------- Page: 4 ----------------------
FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 11358-2:2020(E)
Plastics — Thermogravimetry (TG) of polymers —
Part 2:
Determination of activation energy
1 Scope
This document specifies a method for the determination of the activation energy, E , in the Arrhenius
a
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.
2 Normative references
The following documents are referred to in the text in such a way tha
...
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