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ISO 1628-1:2021 Plastics — Determination of the viscosity of polymers in dilute solution using capillary viscometers —Part 1: General principles

李老师 12/26/2021 浏览 541 ISO 1628-1:2021 全球范围

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Plastics — Determination of the viscosity of polymers in dilute solution using capillary viscometers —Part 1: General principles是于2021-02发布的ISO标准，适用于全球范围。

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Plastics — Determination of the viscosity of polymers in dilute solution using capillary viscometers —Part 1: General principles
Plastics — Determination of the viscosity of polymers in dilute solution using capillary viscometers —Part 1: General principles(截图)

 

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标准部分原文

Plastics — Determination of the viscosity of polymers in dilute solution using capillary viscometers —

Part 1: General principles

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.

ISO 3105, Glass capillary kinematic viscometers — Specifications and operating instructions

ISO 80000-1, Quantities and units — Part 1: General

ISO 80000-4, Quantities and units — Part 4: Mechanics

3 Terms a nd definiti ons

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:

— ISO Online browsing platform: available at https:// www .iso .org/ obp

— IEC Electropedia: available at http:// www .electropedia .org/ 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

τη= γ

where

τ is the shear stress;

η is the viscosity;

γ

dV

is the velocity gradient or rate of shear, given by where V is the velocity of one plane relative dz

to the other and z the coordinate perpendicular to the two planes.

−1 −1

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

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

−3

Note 3 to entry: For practical use, the sub-multiple 10 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.

3.1.2

viscosity/density ratio

kinematic viscosity

v

ratio defined by the formula

η

v=

ρ

where ρ is the density of the fluid at the temperature at which the viscosity is measured

2 −1

Note 1 to entry: The dimensions of kinematic viscosity are L T .

2 −1

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

−6 2 −1 2 −1

Note 3 to entry: For practical use, the sub-multiple 10 m ·s , i.e. mm ·s , is more convenient.

3.2 Terms related to polymer solutions

3.2.1

relative viscosity

viscosity ratio

η

r

ratio of the viscosity of the polymer solution (of stated concentration) η and the viscosity of the pure solvent η , at the same temperature:

0

η

η =

r

η

0

Note 1 to entry: The ratio has no dimensions.

3.2.2

relative viscosity increment

v i s c o s it y r at io i nc r ement a nd s p e c i f ic v i s c o s it y

viscosity ratio minus one

ηη−

 

η

0

−=1

 

η η

 

0 0

Note 1 to entry: The increment has no dimensions.

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