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Abstract
Surface tensions of aliphatic polyesters having different lengths of the methylene sequence were measured by the sessile bubble method from 120 to 160°C. Surface tension decreased with an increase in the number (m) of carbon atoms in the methylene sequence. The linear relationship between γ and 1/(m+1) was derived from Sugden's equation which defined the parachor and the measured values fell on a single straight line. Surface tension of the ester group was also estimated as 56.6 dyn/cm.