Analytical behaviour of poly(vinyl acetate) and its hydrolysis products with iodine.
Formation of the red complex between poly(vinyl acetate) and iodine in the presence of iodide is quantitatively independent of the method by which the polymer is prepared. In contrast, the amount of complex formed in the case of partly hydrolysed products of poly(vinyl acetate) depends strongly on the source of this polymer and may vary from sample to sample by as much as a factor of five, while the use of different hydrolysis methods gives rise to even greater differences in the amount of complex formed by the products. The determination of partly hydrolysed poly(vinyl acetate) through the red iodine complex is recommended only when the standard polymer sample and the unknown have been prepared in the same batch. Details of these systems are discussed.
Hughes
J M
JM
Department of Chemistry, North East London Polytechnic, Stratford, London, E.15 U.K.
Joshi
D P
DP
Pritchard
J G
JG