ISO 1628-1:2021 プラスチック—キャピラリー粘度計を使用した希薄溶液中のポリマーの粘度の測定—パート1：一般原則 | ページ 2

Foreword

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This document was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 5, Physical-chemical properties, in collaboration with the European Committee for Standardization (CEN) Technical Committee CEN/TC 249, Plastics, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).

This fourth edition cancels and replaces the third edition (ISO 1628-1:2009), which has been technically revised. It also incorporates the Amendment 1 ISO 1628-1:2009/Amd 1:2012.

The main changes compared to the previous edition are as follows:

• ISO 3205 (withdrawn) has been deleted from Clause 2;
• the figure keys have been revised;
• nominal viscometer constant has been added to Table 1;

A list of all parts in the ISO 1628 series can be found on the ISO website.

1 Scope

This document defines the general conditions for the determination of the reduced viscosity, intrinsic viscosity and K‑value of organic polymers in dilute solution. It defines the standard parameters that are applied to viscosity measurement.

This document is used to develop standards for measuring the viscosities in solution of individual types of polymer. It is also used to measure and report the viscosities of polymers in solution for which no separate standards exist.

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 80000-1, ISO 80000-4 and the following apply.

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

3.1 Terms related to any liquid

3.1.1

viscosity

property of a fluid sheared between two parallel plates, one of which moves relative to the other in uniform rectilinear motion in its own plane, defined by the Newton formula

where

	τ	is the shear stress;
	η	is the viscosity;
		is the velocity gradient or rate of shear, given by where V is the velocity of one plane relative to the other and z the coordinate perpendicular to the two planes.

Note 1 to entry: The dimensions of viscosity are ML⁻¹T⁻¹.

Note 2 to entry: The units of viscosity are Pa·s.

Note 3 to entry: For practical use, the sub-multiple 10⁻³ Pa·s is more convenient.

Note 4 to entry: Viscosity is usually taken to mean “Newtonian viscosity”, in which case the ratio of shearing stress to velocity gradient is constant. In non-Newtonian behaviour, which is the usual case with high-polymer solutions, the ratio varies with the shear rate. Such ratios are often called “apparent viscosities” at the corresponding shear rate.

3.2 Terms related to polymer solutions

3.2.6

K‑value

constant, independent of the concentration of the polymer solution and peculiar to the polymer sample, which is a measure of the average degree of polymerization:

K-value=1 000 k

Note 1 to entry: According to H. Fikentscher^[1], k is calculated as follows:

and therefore

where

		is the viscosity ratio (see 3.2.1);
	c	is the concentration, in 103 kg/m3, i.e. g/cm3.

Note 2 to entry: A limiting viscosity number [η]_k can be calculated from k:

Bibliography