|
I NT ERN AT1 ON AL O RG A N I ZATl ON FO R STA N DARD I2 AT1 ON
IS0 RECOMMENDATION
R 174
PLASTICS
DETERMINATION OF VISCOSITY NUMBER
OF POLYVINYLCHLORIDE RESIN IN SOLUTION
1st E D IT I ON
February 1961
COPYRIGHT RESERVED
The copyright of IS0 Recommendations and IS0 Standards
belongs to IS0 Member Bodies. Reproduction of !hese
documents, in any country, may be authorized therefore only
by the national standards organization of that country, be&
a member of ISO.
---------------------- Page: 1 ----------------------
BRIEF HISTORY
The IS0 Recommendation R 174, Determination of Viscosity Number of Polyvinyl-
chloride Resin in Solution, was drawn up by Technical Committee ISO/TC 61, Plastics, the
Secretariat of which is held by the American Standards Association, Incorporated (ASA).
Work on this matter which the Technical Committee had begun since 1954, came to
an end in 1956, with the adoption of a proposal as a Draft IS0 Recommendation.
On 28 November 1958, the Draft IS0 Recommendation (No. 189) was distributed to
all the IS0 Member Bodies and was approved, subject to some editorial amendments, by
the following Member Bodies :
Australia India Spain
Austria Israel Sweden
Belgium Italy Switzerland
Bulgaria
Japan Turkey
Burma Netherlands United Kingdom
Czechoslovakia Poland U.S.A.
Germany Portugal U.S.S.R.
Hungary Romania
One Member Body opposed the approval of the Draft : France.
The Draft IS0 Recommendation was then submitted by correspondence to the IS0
Council, which decided, in February 1961, to accept it as an IS0 RECOMMENDATION.
-3-
---------------------- Page: 2 ----------------------
ISO/ R 174 - I961 (E)
IS0 Recommendation
R 174
February 1961
-
PLASTICS
DETERMINATION OF VISCOSITY NUMBER
OF POEYVINYLCHLORIDE RESIN IN SOLUTION
1. SCOPE
The purpose of this IS0 Recommendation is to describe the determination of the viscosity num-
ber * of a solution in cyclohexanone of polyvinylchloride resin or of copolymer, in which the main
repeating unit is that of vinylchloride. The methods applies only to those resins that give stable
solutions and reproducible results under the conditions of test described herein. The times of
flow of the solvent and a solution of resin at 0.005 g/ml are measured at 25 "C by conventional
methods and the viscosity number is calculated from these measurements and from the known
concentration of the solution. Density difference and kinetic energy corrections are small in this
method and are not applied.
2. APPARATUS
The apparatus consists of the following:
2.1 Automatic pipette of 50 ml and 150 ml flat-bottomed flask with ground-glass stopper or
50 ml volumetric flask with ground-glass stopper.
2.2 Funnel .- sintered glass filter funnel.
Thermostatical bath, maintained at 25 f 0.05 "C.
2.3
2.4 Viscometer, suspended-level Ubbelohde type of which the essential dimensions are as
Alternatively, any other viscorneter which can be shown
shown in the Figure, page 6.
to give the same results.
Balance, to weigh to 0.0001 g.
2.5
2.6 Stop-watch, reading to 0.1 second.
* The term viscosity number, formerly " reduced viscosity ", has been recommended for adoption by the Inter-
national Union of Pure and Applied Chemistry (IUPAC).
Details are given in the Journal of Polymer Science, Vol. VI11 (1952), No. 3, pages 269-270, where it is defined
as follows:
(1) - 70)
Viscosity number = ___
1)o c
where 1) = absolute viscosity of solution,
q0 = absolute viscosity of solvent, and
C = concentration in grammes, of solute per millilitre of soluti
...