Acidic and glycol repeat units

6 Acidic And Glycol Repeat Units In Terylene (Dacron) [Pg.27]

Terylene is manufactured from terephthalic acid and ethylene glycol as follovsrs [Pg.27]

Such polymers contain repeat units based on ethylene glycol and indeed other glycols such as 1,4-butane diol, and terephthalic acid and proportions of isophthalic acid. Allen et al developed a precise quantitative method (method 43) for determining such units in terylene. The sample is subject to an alkaline hydrolysis and glycol and acidic [Pg.27]

It has been observed that in the preparation of polyester for compositional analysis by NMR spectroscopy much higher rates of hydrolysis are achieved by refluxing polyethylene terephthalate with a mixture of sodium hydroxide, an alcohol (methanol) and a protic solvent (dimethyl sulphoxide) than is achieved with the usual alcoholic alkali reagents. [Pg.28]

Big Chemical Encyclopedia