Sell Polyvinyl Alcohol

Synonyms: vinyl alcohol polymer
cas number: 9002-89-5, molecular weight: poly, chemical formula: (c2h4o)x, einecs ec number: ----, fema: ----,
poly(vinyl alcohol) or poly vinyl alcohol bp grade
ph eur
poly(vinyl alcohol) is obtained by polymerisation of vinyl acetate, followed by partial or almost complete hydrolysis of poly(vinyl acetate) in the presence of catalytic amounts of alkali or mineral acids.
Poly(vinyl alcohol) polymers comply with the following indices:
the mean relative molecular mass lies between 20 000 and 150 000. The viscosity is 3 to 70
mpas. The ester value which characterises the degree of hydrolysis is not greater than 280.
Characters
appearance: yellowish-white powder or translucent granules.
Solubility: soluble in water, slightly soluble in ethanol, practically insoluble in acetone.
Various grades of poly(vinyl alcohol) are available. They differ in their degree of polymerisation and their degree of hydrolysis which determine the physical properties of the different grades. They are characterised by the viscosity and the ester value of the substance.
Identification
a. Infrared absorption spectrophotometry: to pass the test.
Preparation discs; in some cases, the sample has to be milled, after cooling if necessary, before preparing the discs.
The spectrum obtained shows absorption maxima corresponding to poly(vinyl alcohol) at 2940 cm-1 and 2920 cm-1.
B. It complies with the test for viscosity (see tests).
Tests
solution s: heat on a water-bath 250 ml of water r in a borosilicate round-bottomed flask attached to a reflux condenser with stirrer, add 10.0 g of the substance to be examined and continue heating for 30 min with continuous stirring. Remove the flask from the water-bath and continue stirring until room temperature is reached.
Appearance of solution: solution s is clear and not more intensely coloured than reference solution.
Ph: 4.5 to 6.5 for solution s.