Abstract
A chemical method is described for the quantitative determination of vinylester end groups (VE groups) in polyethylene terephthalate (PETP). The method is based on coulometric bromination of a solution of PETP in di-chloroacetic acid containing potassium bromide, water and mercury(II) chloride. As some impurities present in PETP are also brominated, a correction for this effect is carried out. The standard deviation of the method is 0.25 mmol/kg in the region of 1–20 mmol/kg.
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