Plastics -- Epoxy resins -- Determination of degree of crosslinking of crosslinked epoxy resins by Fourier Transform Infrared (FTIR) Spectroscopy

ISO 20368:2017 specifies a method for determining the degree of crosslinking of crosslinked epoxy resins by the disappearance of the epoxy group during epoxy resin crosslinking measured by Fourier Transform Infrared (FTIR) (with a transmittance mode) spectroscopy.

Plastiques -- Résines époxy -- Détermination du degré de réticulation des résines époxy réticulées par spectroscopie infrarouge à transformée de Fourier (FTIR)

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Status
Published
Publication Date
16-Nov-2017
Current Stage
6060 - International Standard published
Start Date
14-Oct-2017
Completion Date
17-Nov-2017
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ISO 20368:2017 - Plastics -- Epoxy resins -- Determination of degree of crosslinking of crosslinked epoxy resins by Fourier Transform Infrared (FTIR) Spectroscopy
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INTERNATIONAL ISO
STANDARD 20368
First edition
2017-11
Plastics — Epoxy resins —
Determination of degree of
crosslinking of crosslinked epoxy
resins by Fourier Transform Infrared
(FTIR) Spectroscopy
Plastiques — Résines époxy — Détermination du degré de
réticulation des résines époxy réticulées par spectroscopie infrarouge
à transformée de Fourier (FTIR)
Reference number
ISO 20368:2017(E)
ISO 2017
---------------------- Page: 1 ----------------------
ISO 20368:2017(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2017, Published in Switzerland

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form

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ii © ISO 2017 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 20368:2017(E)
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..................................................................................................................................................................................................................... 4

7.1 Preparation of measuring .............................................................................................................................................................. 4

7.2 Preliminary test ...................................................................................................................................................................................... 4

7.2.1 General...................................................................................................................................................................................... 4

7.2.2 Procedure for preliminary test ............................................................................................................................ 4

7.3 FTIR measurement on the crosslinked sample under investigation ........................................................ 5

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 .................................................................................................................................................................. 6

10 Test report ................................................................................................................................................................................................................... 6

Bibliography ................................................................................................................................................................................................................................ 7

© ISO 2017 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 20368:2017(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 on 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 the following

URL: www.iso.org/iso/foreword.html.

This document was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 12,

Thermosetting materials.
iv © ISO 2017 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 20368:2017(E)
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 approaches are inadequate in cases where the test sample 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 measuring the disappearance of the epoxy

group during the resin crosslinking, using Fourier Transform Infrared spectroscopy.

The advantages of this method are that sample preparation is simple, measurements can be made with

very small amounts of resin and it is possible to measure the reaction rate of the epoxy group for an

epoxy compound containing another active functional group. For these reasons, this document is useful

for investigations and for establishing conditions for crosslinking reactions. It can also be used for

production and quality control.

Since epoxy resin systems are highly diverse, the applicability of this document to each resin system is

intended to be established prior determination. A technique to test the applicability to any epoxy resin

system is included in this document.
© ISO 2017 – All rights reserved v
---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 20368:2017(E)
Plastics — Epoxy resins — Determination of degree
of crosslinking of crosslinked epoxy resins by Fourier
Transform Infrared (FTIR) Spectroscopy

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 for determining the degree of crosslinking of crosslinked epoxy

resins by the disappearance of the epoxy group during epoxy resin crosslinking measured by Fourier

Transform Infrared (FTIR) (with a transmittance mode) spectroscopy.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the
...

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