ISO 16152:2022 プラスチック—ポリプロピレン中のキシレン可溶性物質の測定 | ページ 2

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, 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 ).

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 9, Thermoplastic materials.

This second edition cancels and replaces the first edition (ISO 16152:2005), which has been technically revised.

The main changes are as follows:

• the introduction has been updated;
• the mandatory normative references clause has been added and subsequent clauses have been renumbered;
• the pipette with capacity of 200 ml has been deleted from the list of apparatus;
• the symbols S_s, S_m and S_c have been replaced with w_s, w_m and w_c, respectively (see 3.1 and 4.5);
• an automated instrumental method has been added (see Clause 5);
• a new informative Annex A (Precision data for polypropylene obtained from an intercomparison of xylene-soluble content testing) has been added.

Introduction

With the development of analytical and testing instruments, a new technique of measuring xylene-soluble matter in polypropylene by automatic instrument has been developed. Automation improves the precision, removing human-factor variability, and enhances safety for the laboratory and the operator.

The soluble content represents the fraction of amorphous material and it is important as it has a major influence on the properties of the polypropylene.

The method is used to quantify the soluble/amorphous fraction in polypropylene homopolymers as well as copolymers and can be used with other polyolefin materials, such as homopolymer polyethylene or polyethylene α-olefin copolymers.

1 Scope

This document specifies two methods of determining the mass fraction of a polypropylene homopolymer or copolymer which is amorphous, expressed as soluble in xylene at 25 °C.

• Method 1: Reference method;
• Method 2: Automated instrumental method.

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 472 and the following apply.

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

Bibliography