ISO 14322:2018

INTERNATIONAL ISO
STANDARD 14322
Second edition
2018-07
Plastics — Epoxy resins —
Determination of degree of
crosslinking of crosslinked epoxy
resins by differential scanning
calorimetry (DSC)
Plastiques — Résines époxydes — Détermination du degré
de réticulation des résines époxydes réticulées par analyse
calorimétrique différentielle (DSC)
Reference number
©
ISO 2018
© ISO 2018
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ii © ISO 2018 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Materials . 3
6 Apparatus . 3
7 Procedure. 3
7.1 Calibration . 3
7.2 Preliminary test . 4
7.2.1 General. 4
7.2.2 Procedure for preliminary test . 4
7.3 DSC measurement on the crosslinked resin under investigation . 4
8 Expression of results . 5
9 Precision . 5
9.1 General . 5
9.2 Materials and crosslinking conditions . 5
9.3 Precision of the method . 5
10 Test report . 6
Annex A (informative) Example of a procedure used for the preliminary test, with typical
operating conditions . 7
Bibliography . 8
Foreword
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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).
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URL: www .iso .org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 12,
Thermosetting materials.
This second edition cancels and replaces the first edition (ISO 14322:2012), of which it constitutes a
minor revision.
The changes compared to the previous edition are as follows:
— the title has been updated (DSC has been added at the end);
— Clause 2 has been updated;
— the subclauses under 7.2 have been renumbered;
— editorial changes have been applied.
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 2018 – All rights reserved

Introduction
It is possible to determine the degree of crosslinking of a crosslinked epoxy resin by observing changes
in its mechanical, electrical or thermal properties.
However, such an approach is inadequate in cases in which the test sample is to be evaluated as is or
is to be examined under various crosslinking conditions. This document provides a method whereby
the degree of crosslinking is determined without the need for complicated procedures for preparing,
conditioning or configuring the test sample. The degree of crosslinking is determined by comparing the
heat of the crosslinking reaction for the test sample with that of a reference sample, using a differential
scanning calorimeter.
The advantages of this method are that sample preparation is simple and measurements can be made
with very small amounts of sample. For these reasons, this document is useful for investigations of,
and in establishing conditions for, crosslinking reactions. It can also be used for production and quality
control.
Finally, since epoxy resin systems are highly diverse, the applicability of this document to each resin
system needs be established. A technique to test the applicability to an epoxy resin system is included
in this document.
INTERNATIONAL STANDARD ISO 14322:2018(E)
Plastics — Epoxy resins — Determination of degree of
crosslinking of crosslinked epoxy resins by differential
scanning calorimetry (DSC)
SAFETY STATEMENT — Persons using this document should be familiar with normal laboratory
practice, if applicable. This document does not purport to address all of the safety concerns, if
any, associated with its use. It is the responsibility of the user to establish appropriate safety
and health practices and to determine the applicability of any other restrictions.
1 Scope
This document specifies a method whereby the heat of reaction generated during epoxy resin
crosslinking is measured by differential scanning calorimetry (DSC). The degree of crosslinking is
determined based on this result.
This method is applicable to epoxy resin systems with a moderate or slow crosslinking-reac
...