ISO 1597:1975

Plastics — Unplasticized cellulose acetate — Determination of acetic acid yield

Matières plastiques — Acétate de cellulose non plastifié — Determination du titre en acide acétique

General Information

• Status: Withdrawn
• Publication Date: 31-May-1975
• Withdrawal Date: 31-May-1975
• ICS: 83.080.20 - Thermoplastic materials
• Technical Committee: ISO/TC 61/SC 9 - Thermoplastic materials
• Drafting Committee: ISO/TC 61/SC 9 - Thermoplastic materials
• Current Stage: 9599 - Withdrawal of International Standard
• Completion Date: 05-Oct-1994

Relations

• Revised: ISO 1597:1994 - Plastics — Unplasticized cellulose acetate — Determination of acetic acid yield
• Effective Date: 15-Apr-2008
• Consolidated By: ISO 13480:1997 - Polyethylene pipes — Resistance to slow crack growth — Cone test method
• Effective Date: 06-Jun-2022

Standards Content (Sample)

INTERNATIONAL STANDARD 1597
INTERNATIONAL ORGANIZATION FOR STANOAROIZATION *ME)KfiYHAPOWAJl OPrAHMJAUWR no CTAHnAPTH3AUWH .ORGANISATION INTERNATIONALE DE NORMALISATION
Plastics - Unplasticized cellulose acetate - Determination
of acetic acid yield
Matières plastiques - Acétate de ceiiuiose non plastifié - Détermination du titre en acide acétique
First edition - 1975-06-15
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UDC 678.544.4 : 547.292 Ref. No. IS0 1597-1975 (E)
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Descriptors : plastics, cellulosic resins, cellulose acetate, chemical analysis, determination of content, acetic acid, volumetric analysis.
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Price based on 3 pages

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FOREWORD
IS0 (the International Organization for Standardization) is a worldwide federation
of national standards institutes (IS0 Member Bodies). The work of developing
International Standards is carried out through IS0 Technical Committees. Every
Member Body interested in a subject for which a Technical Committee has been set
up 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.
Draft International Standards adopted by the Technical Committees are circulated
to the Member Bodies for approval before their acceptance as International
Standards by the IS0 Council.
Prior to 1972, the results of the work of the Technical Committees were published
as IS0 Recommendations; these documents are now in the process of being
transformed into International Standards. As part of this process, Technical
Committee ISO/TC 61 has reviewed IS0 Recommendation R 1597 and found it
technically suitable for transformation. International Standard IS0 1597 therefore
replaces IS0 Recommendation R 1597-1970 to which it is technically identical.
IS0 Recommendation R 1597 was approved by the Member Bodies of the
following countries :
Austria India Romania
Belgium I ran South Africa, Rep. of
Brazil Israel Spain
Czechoslovakia Italy Sweden
Egypt, Arab Rep. of Japan Switzerland
France Netherlands Turkey
United Kingdom
Germany Poland
Hungary Portugal U.S.A.
No Member Body expressed disapproval of the Recommendation.
The Member Body of the following country disapproved' the transformation of
ISO/R 1597 into an International Standard :
Canada
3 International Organization for Standardization, 1975
Printed in Switzerland

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IS0 1597-1975 (E)
INTERNATIONAL STANDARD
Plastics - Unplasticized cellulose acetate - Determination
of acetic acid yield
Determination, by titration, of the amount of alkali
1 SCOPE AND FIELD OF APPLICATION
consumed in hydrolysing the cellulose acetate.
This International Standard specifies two methods for the
NOTE - In applying method E, care must be taken to avoid direct
determination of acetic acid yield of unplasticized cellulose
contact of the dimethylsulphoxide with the human skin, because of
acetate.
the toxic hazard.
These methods are intended for cellulose acetate without
plasticizers and free of additives, fillers, dyes or other
materials which affect the tests. When they are present,
they must be separated by a method agreed between the
contracting parties. 5 METHODA
The methods are applicable to cellulose acetate having any
5.1 Reagents
acetic acid yield.
Method A is applicable to cellulose acetate in the form of
5.1.1 Distilled water, freshly boiled to remove carbon
finely divided powder. Method B is applicable to cellulose
dioxide and cooled.
acetate in any physical form (powder, grains, flakes, etc.).
5.1.2 Acetone, analytical grade.
5.1.3 Sulphuric acid, approximately N solution.
2 REFERENCE
ISO/R 585, Plastics - Determination of the moisture 5.1.4 Sodium hydroxide, approximately N solution.
con tent of non-plasticized cellulose acetate.
5.1.5 Sodium hydroxide, standard 0,5 N solution,
carbonate-f ree.
3 DEFINITION
5.1.6 Phenolphthalein solution, 1 O g/I in ethanol.
--
acetic acid yield : The quantity of acetic acid, in grams per
NOTE - In order to ensure that there will be a positive
100 g of dry cellulose acetate, as calculated from the
back-titration value in the blank, the normality of the sulphuric acid
(5.1.3) should be greater than that of sodium hydroxide (5.1.4).
amount of sodium hydroxide necessary for the complete
hydrolysis of the cellulose acetate.
5.2 Apparatus
5.2.1 Flasks, 250 ml, with ground glass stoppers.
4 PRINCIPLE
5.2.2 Burettes, 50 ml, graduated in 0.1 ml.
4.1 Method A
Leaving finely divided cellulose acetate in contact with a
5.2.3 Analytical balance, accurate to 0,001 g.
mixture of acetone and aqueous sodium hydroxide
sol uti on.
5.3 Test sample
Determination, by titration, of the amount of alkali
consumed in hydrolysing the cellulose acetate.
5.3.1 The sample of cellulose acetate must be in the form
of powder passing entirely through a sieve of mesh 710 pm;
4.2 Method B
if it does not, it shall be ground, or Method B used.
Taking the cellulose acetate into solution in
5.3.2 Determine the moisture content of the sample of
dimethylsulphoxide and adding aqueous sodium hydroxide
solution. c
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