The Cohesive Force of a Copolymer at Oil/Water Interface

Department of Physical Chemistry, University College of Science & Technology, Calcutta-9 Received 24 September 1971; revised M SS received 21 February 1972 It was generally believed that Cohesive force or Cohesive surface pressure between the CH2 groups of the neighbouring hydrocarbon chains does not exist at oil/water interface. In some recent publications, it has been shown that such force exists at oil/water interface in the case of long-chain electrolytes. In the present study, experimental evidence in favour of the latter view has not only been cited but also been extended to polymer systems, which have not yet been studied