Plastics - Determination of dynamic mechanical properties - Part 2: Torsion-pendulum method (ISO 6721-2:2019)

This document specifies two methods (A and B) for determining the linear dynamic mechanical properties of plastics, i.e. the storage and loss components of the torsional modulus, as a function of temperature, for small deformations within the frequency range from 0,1 Hz to 10 Hz.
NOTE The temperature dependence of these properties, measured over a sufficiently broad range of temperatures (for example from −50 °C to +150 °C for most commercially available plastics), gives information on the transition regions (for example the glass transition and the melting transition) of the polymer. It also provides information concerning the onset of plastic flow.
The two methods described are not applicable to non-symmetrical laminates (see ISO 6721-3). The methods are not suitable for testing rubbers, for which the user is referred to ISO 4664-2.

Kunststoffe - Bestimmung dynamisch-mechanischer Eigenschaften - Teil 2: Torsionspendel-Verfahren (ISO 6721-2:2019)

Dieses Dokument legt zwei Verfahren (A und B) fest, um die linearen dynamisch mechanischen Eigenschaften von Kunststoffen zu bestimmen, und zwar die Speicher  und Verlustkomponenten des Torsionsmoduls als Funktion der Temperatur für kleine Verformungen im Frequenzbereich von 0,1 Hz bis 10 Hz.
ANMERKUNG   Die Temperaturabhängigkeit dieser Größen, ermittelt in einem ausreichend weiten Temperaturbereich (zum Beispiel für die meisten kommerziell erhältlichen Kunststoffe von −50 °C bis +150 °C), liefert Informationen zu den Übergangsbereichen (zum Beispiel für den Übergang „glasartig gummiartig“ oder den Schmelz¬übergang) des Polymers. Außerdem werden Informationen zum Beginn des plastischen Fließens angegeben.
Die beiden beschriebenen Verfahren sind nicht anwendbar auf unsymmetrische Laminate (siehe ISO 6721 3). Die Verfahren sind nicht geeignet zur Prüfung von Elastomeren. Hierzu wird auf ISO 4664 2 verwiesen.

Plastiques - Détermination des propriétés mécaniques dynamiques - Partie 2: Méthode au pendule de torsion (ISO 6721-2:2019)

Le présent document spécifie deux méthodes (A et B) pour la détermination des propriétés mécaniques dynamiques linéaires des plastiques, c'est-à-dire des composantes de conservation et de perte du module en torsion en fonction de la température, pour de petites déformations dans la gamme de fréquences allant de 0,1 Hz à 10 Hz.
NOTE La dépendance thermique de ces propriétés, mesurée sur une gamme de températures suffisamment large (par exemple de −50 °C à +150 °C pour la plupart des plastiques disponibles dans le commerce), donne des informations sur les zones de transition (par exemple transition vitreuse ou fusion) d'un polymère. Elle donne aussi une information au sujet du début de l'écoulement d'un plastique.
Les deux méthodes décrites ici ne sont pas applicables aux stratifiés asymétriques (voir l'ISO 6721‑3). Ces méthodes ne conviennent pas non plus pour l'essai des caoutchoucs, qui sont traités dans l'ISO 4664‑2.

Polimerni materiali - Ugotavljanje dinamičnih mehanskih lastnosti - 2. del: Metoda s torzijskim nihalom (ISO 6721-2:2019)

Različni deli standarda ISO 6721 določajo metode za določanje dinamičnih mehanskih lastnosti togih polimerov v območju linearnega viskoelastičnega vedenja. Ta dokument določa opredelitve in opisuje splošna načela, vključno z vsemi vidiki, ki so skupni posameznim preskusnim metodam, opisanim v naslednjih delih.
Različni načini deformacije lahko dajo rezultate, ki niso neposredno primerljivi. Natezne vibracije na primer
povzročijo napetost, ki je enakomerna po celotni debelini vzorca, medtem ko na upogibne meritve prednostno vplivajo lastnosti površinskih predelov preskušanca.
Vrednosti, pridobljene z upogibnim preskusom, bodo z vrednostmi, pridobljenimi z nateznim preskusom, primerljive le pri stopnji natezanja, pri čemer je razmerje med napetostjo in deformacijo linearno, in za preskušance, ki imajo homogeno
strukturo.

General Information

Status
Published
Public Enquiry End Date
30-Apr-2018
Publication Date
17-Jun-2019
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
07-Jun-2019
Due Date
12-Aug-2019
Completion Date
18-Jun-2019

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SLOVENSKI STANDARD
SIST EN ISO 6721-2:2019
01-september-2019
Nadomešča:
SIST EN ISO 6721-2:2008

Polimerni materiali - Ugotavljanje dinamičnih mehanskih lastnosti - 2. del: Metoda

s torzijskim nihalom (ISO 6721-2:2019)

Plastics - Determination of dynamic mechanical properties - Part 2: Torsion-pendulum

method (ISO 6721-2:2019)
Kunststoffe - Bestimmung dynamisch-mechanischer Eigenschaften - Teil 2:
Torsionspendel-Verfahren (ISO 6721-2:2019)

Plastiques - Détermination des propriétés mécaniques dynamiques - Partie 2: Méthode

au pendule de torsion (ISO 6721-2:2019)
Ta slovenski standard je istoveten z: EN ISO 6721-2:2019
ICS:
83.080.01 Polimerni materiali na Plastics in general
splošno
SIST EN ISO 6721-2:2019 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 6721-2:2019
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SIST EN ISO 6721-2:2019
EN ISO 6721-2
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2019
EUROPÄISCHE NORM
ICS 83.080.01 Supersedes EN ISO 6721-2:2008
English Version
Plastics - Determination of dynamic mechanical properties
- Part 2: Torsion-pendulum method (ISO 6721-2:2019)

Plastiques - Détermination des propriétés mécaniques Kunststoffe - Bestimmung dynamisch-mechanischer

dynamiques - Partie 2: Méthode au pendule de torsion Eigenschaften - Teil 2: Torsionspendel-Verfahren (ISO

(ISO 6721-2:2019) 6721-2:2019)
This European Standard was approved by CEN on 8 June 2018.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this

European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references

concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN

member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by

translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 6721-2:2019 E

worldwide for CEN national Members.
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SIST EN ISO 6721-2:2019
EN ISO 6721-2:2019 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

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SIST EN ISO 6721-2:2019
EN ISO 6721-2:2019 (E)
European foreword

This document (EN ISO 6721-2:2019) has been prepared by Technical Committee ISO/TC 61 "Plastics"

in collaboration with Technical Committee CEN/TC 249 “Plastics” the secretariat of which is held by

NBN.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by November 2019, and conflicting national standards

shall be withdrawn at the latest by November 2019.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN ISO 6721-2:2008.

According to the CEN-CENELEC Internal Regulations, the national standards organizations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,

Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,

France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,

Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
Endorsement notice

The text of ISO 6721-2:2019 has been approved by CEN as EN ISO 6721-2:2019 without any

modification.
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SIST EN ISO 6721-2:2019
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SIST EN ISO 6721-2:2019
INTERNATIONAL ISO
STANDARD 6721-2
Third edition
2019-04
Plastics — Determination of dynamic
mechanical properties —
Part 2:
Torsion-pendulum method
Plastiques — Détermination des propriétés mécaniques
dynamiques —
Partie 2: Méthode au pendule de torsion
Reference number
ISO 6721-2:2019(E)
ISO 2019
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SIST EN ISO 6721-2:2019
ISO 6721-2:2019(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2019

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
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
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SIST EN ISO 6721-2:2019
ISO 6721-2:2019(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Principle ........................................................................................................................................................................................................................ 1

5 Test apparatus ......................................................................................................................................................................................................... 3

5.1 Pendulum ..................................................................................................................................................................................................... 3

5.2 Inertial element ...................................................................................................................................................................................... 3

5.2.1 General...................................................................................................................................................................................... 3

5.2.2 Method A (see Figure 1) ............................................................................................................................................ 3

5.2.3 Method B (see Figure 2) ............................................................................................................................................ 3

5.3 Clamps ............................................................................................................................................................................................................ 3

5.4 Oscillation-inducing device .......................................................................................................................................................... 4

5.5 Oscillation-frequency and oscillation-amplitude recording equipment ............................................... 4

5.6 Temperature-controlled chamber .......................................................................................................................................... 4

5.7 Gas supply ................................................................................................................................................................................................... 4

5.8 Temperature-measurement device ....................................................................................................................................... 4

5.9 Devices for measuring test-specimen dimensions .................................................................................................. 4

6 Test specimens........................................................................................................................................................................................................ 4

6.1 General ........................................................................................................................................................................................................... 4

6.2 Shape and dimensions ...................................................................................................................................................................... 4

6.3 Preparation ................................................................................................................................................................................................ 5

7 Number of specimens ...................................................................................................................................................................................... 5

8 Conditioning .............................................................................................................................................................................................................. 5

9 Procedure..................................................................................................................................................................................................................... 5

9.1 Test atmosphere .................................................................................................................................................................................... 5

9.2 Measurement of specimen cross-section ......................................................................................................................... 5

9.3 Mounting the test specimens ...................................................................................................................................................... 5

9.4 Varying the temperature ................................................................................................................................................................ 5

9.5 Performing the test.............................................................................................................................................................................. 5

10 Expression of results ........................................................................................................................................................................................ 6

10.1 Symbols and correction factors ................................................................................................................................................ 6

10.2 Calculation of logarithmic decrement, Λ ......................................................................................................................... 7

10.3 Calculation of torsional storage modulus, G ......................................................................................................... 8

10.4 Calculation of torsional loss modulus, G .................................................................................................................. 8

11 Precision ....................................................................................................................................................................................................................... 9

12 Test report ................................................................................................................................................................................................................... 9

Annex A (normative) Influence of longitudinal force, W ..............................................................................................................10

Annex B (informative) Damping correction factor, F .....................................................................................................................11

Annex C (informative) Dimensional correction factor, F ............................................................................................................12

Bibliography .............................................................................................................................................................................................................................13

© ISO 2019 – All rights reserved iii
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SIST EN ISO 6721-2:2019
ISO 6721-2:2019(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 porperties.

This third edition cancels and replaces the second edition (ISO 6721-2:2008), which has been technically

revised. The main changes compared to the previous edition are as follows:
— the document has been revised editorially;
— normative references have been changed to undated.
A list of all parts in the ISO 6721 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 2019 – All rights reserved
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SIST EN ISO 6721-2:2019
INTERNATIONAL STANDARD ISO 6721-2:2019(E)
Plastics — Determination of dynamic mechanical
properties —
Part 2:
Torsion-pendulum method
1 Scope

This document specifies two methods (A and B) for determining the linear dynamic mechanical

properties of plastics, i.e. the storage and loss components of the torsional modulus, as a function of

temperature, for small deformations within the frequency range from 0,1 Hz to 10 Hz.

NOTE The temperature dependence of these properties, measured over a sufficiently broad range of

temperatures (for example from −50 °C to +150 °C for most commercially available plastics), gives information

on the transition regions (for example the glass transition and the melting transition) of the polymer. It also

provides information concerning the onset of plastic flow.

The two methods described are not applicable to non-symmetrical laminates (see ISO 6721-3). The

methods are not suitable for testing rubbers, for which the user is referred to ISO 4664-2.

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 6721-1, Plastics — Determination of dynamic mechanical properties — Part 1: General principles

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 6721-1 apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
4 Principle

A test specimen of uniform cross-section is gripped by two clamps, one of them fixed and the other

connected to a disc, which acts as an inertial element, by a rod. The end of the specimen connected to the

disc is excited, together with the disc, to execute freely decaying torsional oscillations. The oscillation

mode is that designated IV in ISO 6721-1, and the type of modulus is G as defined in IS

...

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