ISO 6721-12:2022 プラスチック—動的機械特性の決定— Part 12: 圧縮振動—非共振法 | ページ 2

Foreword

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The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, 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, 2 (see www.iso.org/directives ).

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This document was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 5, Physical-chemical properties.

This second edition cancels and replaces the first edition (ISO 6721-12:2009), which has been technically revised.

The main changes are as follows:

• NOTE 1and NOTE 2 in Clause 1 have been removed;
• the normative references have been updated;
• the description for alternate loading assemblies has been added and the accuracy specification for apparatus has been updated;
• the preferred test specimen sizes have been removed and the requirement for the ratio of thickness/width of the specimen has been added;
• the document has been revised editorially.

A list of all parts in the ISO 6721 series can be found on the ISO website.

1 Scope

This document 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 applicable for measuring dynamic storage moduli of semi-rigid polymers in the range 1 MPa to 1 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).

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.

3 Terms and definitions

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

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

Bibliography