J Mater Sci Technol ›› 2005, Vol. 21 ›› Issue (03): 430-432.

• Research Articles • Previous Articles    

Phase Separation and Theta-compositions of PPES/NMP/non-solvent Systems

Yi SU, Xigao JIAN   

  1. Department of Polymer Science, Dalian University of Technology, Dalian 116012, China
  • Received:2003-09-16 Revised:2003-12-21 Online:2005-05-28 Published:2009-10-10
  • Contact: Xigao JIAN

Abstract: Poly (phthalazinone ether sulfone) (PPES) with 1:1 and 1:3 ratios of bisphenol A (BPA) unit to phthalazinone unit were selected as samples. Polymer precipitation curves for the ternary systems PPES (1:1)/NMP/ non-solvent and PPES (1:3)/NMP/non-solvent were determined by a titration method. Comparison between two sets of data is made. Non-solvents used were H2O, ethyl ether (EE), diethylene glycol (DEGC), ethyleneglycol methylether (EGME) and butanone (BO). NMP/non-solvent theta-compositions for PPES (1:1) and PPES (1:3) were also estimated. It was found that the volume ratio of non-solvent to NMP at the property mutation or worsening of PPES membrane is close to the theta-composition.

Key words: Polymer precipitation curve, Poly (phthalazinone ether sulfone), Theta-composition