Abstract
Three methods for the determination of carboxyl groups in polyethylene terephthalate are investigated, viz. (a) dissolution in hot benzyl alcohol, addition of chloroform, and titration with benzyl alcoholic potassium hydroxide solution to the phenol red end-point, (b) dissolution in a mixture of o-cresol and chloroform, and potentiometric titration with ethanolic potassium hydroxide solution, and (c) dissolution in a mixture of o-cresol, chloroform and acetone, and titration with ethanolic potassium hydroxide solution with HF-indication of the end-point The three methods yield the same results when applied to several samples of different carboxyl content. For several reasons the potentiometric method is preferred to the other two methods.
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