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Copolymers of maleic anhydride‐ 14 C and vinyl acetate as standards in an automated titration method for combined anhydride
Author(s) -
Campbell D. R.
Publication year - 1975
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1975.070190508
Subject(s) - maleic anhydride , titration , copolymer , methyl isobutyl ketone , vinyl acetate , hydrochloric acid , chemistry , polymer chemistry , ketone , hydrolysis , aqueous solution , organic chemistry , polymer
Copolymers of maleic anhydride and vinyl acetate containing 6 to 54 wt‐% maleic anhydride were prepared in both toluene and methyl ethyl ketone by employing carboxyl‐ 14 C‐labeled anhydride of demonstrated radiochemical purity. The standard copolymers thus prepared were used as reference materials in development of an automated titrimetric method for combined anhydride that had a standard deviation of 1.7 wt‐% at an anhydride level of approximately 50%. The semimicrotechnique described is based on dissolution of the polymer in methyl ethyl ketone–aqueous alkali, addition of an aliquot of this solution to a slight excess of hydrochloric acid, and back titration of the excess of acid with standard alkali. The technique effectively prevents hydrolysis of the acetate groups of the copolymer.