ISO 307:2019
Plastics — Polyamides — Determination of viscosity number
This document specifies a method for the determination of the viscosity number of dilute solutions of polyamides in certain specified solvents.
The method is applicable to the polyamides designated PA 46, PA 6, PA 66, PA 69, PA 610, PA 612, PA 11, PA 12, PA 6T/66, PA 6I/6T, PA 6T/6I/66, PA 6T/6I, PA 6I/6T/66 and PA MXD6 as defined in ISO 16396-1, as well as to copolyamides, compounds of polyamides and other polyamides that are soluble in one of the specified solvents under the specified conditions.
The method is not applicable to polyamides produced by anionic polymerization of lactams or produced with cross-linking agents; such polyamides are normally insoluble in the specified solvents.
The viscosity number is determined by the general procedure specified in ISO 1628‑1, observing the particular conditions specified in this document.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents and materials
5.1 Solvents and reagents
5.2 Cleaning liquids
6 Apparatus
7 Preparation of test samples
7.1 General
7.2 Samples containing less than 98 % (by mass) polyamide
8 Calculation of test portion
9 Selection of solvent
10 Procedure
10.1 Cleaning of the viscometer
10.2 Preparation of test solution
10.2.1 General
10.2.2 Volumetric method
10.2.3 Volumetric method, in exact relation to the polymer content
10.2.4 Gravimetric method, in exact relation to the polymer content
10.3 Measurement of flow times
11 Expression of results
12 Repeatability and reproducibility
13 Relationship between the viscosity number determined in 96 % (by mass) sulfuric acid solution and the viscosity determined in various solvents
14 Test report
Annex A (informative) Determination of the concentration of commercial sulfuric acid(95 % to 98 %) and adjustment to 96 % by titration
Annex B (informative) Determination of the concentration of sulfuric acid (95 % to 98 %) and adjustment to 96 % by flow time measurement in a small capillary viscometer
Annex C (informative) Determination of the concentration of commercial formic acid and adjustment to 90 % by titration
Annex D (informative) Determination of the concentration of commercial formic acid and adjustment to 90 % by density measurement
Annex E (informative) Relationship between the viscosity number determined in 96 % (by mass) sulfuric acid solution and the viscosity determined in various solvents
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents and materials
5.1 Solvents and reagents
5.2 Cleaning liquids
6 Apparatus
7 Preparation of test samples
7.1 General
7.2 Samples containing less than 98 % (by mass) polyamide
8 Calculation of test portion
9 Selection of solvent
10 Procedure
10.1 Cleaning of the viscometer
10.2 Preparation of test solution
10.2.1 General
10.2.2 Volumetric method
10.2.3 Volumetric method, in exact relation to the polymer content
10.2.4 Gravimetric method, in exact relation to the polymer content
10.3 Measurement of flow times
11 Expression of results
12 Repeatability and reproducibility
13 Relationship between the viscosity number determined in 96 % (by mass) sulfuric acid solution and the viscosity determined in various solvents
14 Test report
Annex A (informative) Determination of the concentration of commercial sulfuric acid(95 % to 98 %) and adjustment to 96 % by titration
Annex B (informative) Determination of the concentration of sulfuric acid (95 % to 98 %) and adjustment to 96 % by flow time measurement in a small capillary viscometer
Annex C (informative) Determination of the concentration of commercial formic acid and adjustment to 90 % by titration
Annex D (informative) Determination of the concentration of commercial formic acid and adjustment to 90 % by density measurement
Annex E (informative) Relationship between the viscosity number determined in 96 % (by mass) sulfuric acid solution and the viscosity determined in various solvents
Bibliography