ISO 6721-12:2009
(Main)Plastics — Determination of dynamic mechanical properties — Part 12: Compressive vibration — Non-resonance method
Plastics — Determination of dynamic mechanical properties — Part 12: Compressive vibration — Non-resonance method
ISO 6721-12:2009 describes a compressive vibration, non-resonance method for determining the components of the compressive complex modulus E* of polymers at frequencies typically in the range 0,01 Hz to 100 Hz. The method is suitable for measuring dynamic storage moduli of semi-rigid polymers in the range 1 MPa to 1 GPa.
Plastiques — Détermination des propriétés mécaniques dynamiques — Partie 12: Vibration en compression — Méthode hors résonance
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 6721-12
First edition
2009-12-01
Plastics — Determination of dynamic
mechanical properties —
Part 12:
Compressive vibration — Non-resonance
method
Plastiques — Détermination des propriétés mécaniques dynamiques —
Partie 12: Vibration en compression — Méthode hors résonance
Reference number
ISO 6721-12:2009(E)
©
ISO 2009
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ISO 6721-12:2009(E)
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ii © ISO 2009 – All rights reserved
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ISO 6721-12:2009(E)
Contents Page
Foreword .iv
1 Scope.1
2 Normative references.1
3 Terms and definitions .2
4 Principle.2
5 Test device .2
5.1 Loading assembly .2
5.2 Electronic data-processing equipment.2
5.3 Temperature measurement and control.3
5.4 Devices for measuring test specimen dimensions.3
6 Test specimens.4
6.1 Shape and dimensions .4
6.2 Preparation.4
7 Number of test specimens.4
8 Conditioning .4
9 Procedure.4
9.1 Test atmosphere.4
9.2 Measuring the dimensions of and mounting the test specimen .4
9.3 Varying the temperature .5
9.4 Performing the test.5
10 Expression of results.5
10.1 Symbols.5
10.2 Calculation of the compressive storage modulus E′ .6
10.3 Calculation of the loss factor tanδ .6
10.4 Calculation of the compressive loss modulus E′′ .6
10.5 Presentation of data as a function of temperature .6
11 Precision.6
11.1 Test report.6
Bibliography.7
© ISO 2009 – All rights reserved iii
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ISO 6721-12:2009(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 6721-12 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 2, Mechanical
properties.
ISO 6721 consists of the following parts, under the general title Plastics — Determination of dynamic
mechanical properties:
⎯ Part 1: General principles
⎯ Part 2: Torsion-pendulum method
⎯ Part 3: Flexural vibration — Resonance-curve method
⎯ Part 4: Tensile vibration — Non-resonance method
⎯ Part 5: Flexural vibration — Non-resonance method
⎯ Part 6: Shear vibration — Non-resonance method
⎯ Part 7: Torsional vibration — Non-resonance method
⎯ Part 8: Longitudinal and shear vibration — Wave-propagation method
⎯ Part 9: Tensile vibration — Sonic-pulse propagation method
⎯ Part 10: Complex shear viscosity using a parallel-plate oscillatory rheometer
⎯ Part 11: Glass transition temperature
⎯ Part 12: Compressive vibration — Non-resonance method
iv © ISO 2009 – All rights reserved
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INTERNATIONAL STANDARD ISO 6721-12:2009(E)
Plastics — Determination of dynamic mechanical properties —
Part 12:
Compressive vibration — Non-resonance method
1 Scope
This part of ISO 6721 describes a compressive vibration, non-resonance method for determining the
components of the compressive complex modulus E* of polymers at frequencies typically in the range 0,01 Hz
to 100 Hz. The method is suitable for measuring dynamic storage moduli of semi-rigid polymers in the range
1 MPa to 1 GPa (see Notes 1 and 2).
NOTE 1 The method is applicable to the following semi-rigid polymers:
⎯ low-density polyethylene, ultra-high-molecular-weight polyethylene, polybutylene, and ethylene/propylene/diene
copolymer;
⎯ polytetrafluoroethylene, plasticized poly(vinyl chloride), and ethylene/vinyl acetate copolymer;
⎯ thermoplastic elastomers and polyurethane.
NOTE 2 The measurement of dynamic properties of materials with different ranges of moduli can be made using
alternative modes of deformation (i.e. a shear mode for 0,1 MPa < E′ < 50 MPa, a tensile mode for 0,01 GPa < E' < 5 GPa,
a torsional mode for 10 MPa < E′ < 10 GPa, and flexural modes for E′ > 5 GPa.
This method is particularly suited to the measurements of dynamic moduli and loss factors of semi-rigid
plastics in the shape of a right-angled prism, cylinder or tube and can be conveniently used to study the
variation of dynamic properties with temperature and frequency through most of the glass-rubber relaxation
region (see ISO 6721-1:2001, Subclause 9.4). The availability of data determined over wide ranges of both
frequency and temperature enables master plots to be derived, using frequency/temperature shift procedures,
which present dynamic properties over an extended frequency range at different temperatures.
2 Normative references
The following referenced documents are indispensable for the application 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 291, Plastics — Standard atmospheres for conditioning and testing
ISO 293, Plastics — Compression moulding of test specimens of thermoplastic materials
ISO 294-1, Plastics — Injection moulding of test specimens of thermoplastic materials — Part 1: General
principles, and moulding of multipurpose and bar test specimens
ISO 295, Plastics — Compression moulding of test specimens of thermosetting materials
ISO 472, Plastics — Vocabulary
ISO 6721-1:2001, Plastics — Determination of dynamic mechanical properties — Part 1: General principles
ISO 10724-1, Plastics — Injection moulding of test specimens of thermosetting powder moulding compounds
(PMCs) — Part 1: General principles and moulding of multipurpose test specimens
© ISO 2009 – All rights reserved 1
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ISO 6721-12:2009(E)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 6721-1 and ISO 472 apply.
4 Principle
The specimen is subjected to a sinusoidal compressive force or deformation at a frequency significantly below
the fundamental resonance frequency for the clamped/free longitudinal mode. The amplitudes of the force and
displacement cycles applied to the specimen and the phase angle between these cycles are measured.
The storage and loss components of the compressive complex modulus and the loss factor are calculated.
5 Test device
5.1 Loading assembly
5.1.1 General
The requirements on the apparatus are that it shall permit measurements of the amplitudes of, and the phase
...
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