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Citation: CHU TA-KONG. A MODIFIED METHOD FOR THE DETERMINATION OF CARBOXYL END GROUPS OF POLYETHYLENE TEREPHTHALATE[J]. Acta Polymerica Sinica, ;1966, 8(2): 74-78. shu

A MODIFIED METHOD FOR THE DETERMINATION OF CARBOXYL END GROUPS OF POLYETHYLENE TEREPHTHALATE

CHU TA-KONG

A modified method for the carboxyl end group titration of polyethylene terephthalate is presented. The main features of the method are: i) the use of a mixed solvent consisting of phenolchloroform 2:3 V/V to dissolve the polymer sample at 80-100℃ within 2-10 minutes to minimize the error due to thermal degradation of the polymer; ii) direct titration at room temperature; iii) the choice of a suitable indicator, tetrabromo-phenol blue, to give a very sharp end point; iv) the use of a benzyl alcohol solution of potassium hydroxide as titrant for good miscibility with the solution being titrated.
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