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Thermodynamic study of a water–dimethylformamide–polyacrylonitrile ternary system
Author(s) -
Tan Lianjiang,
Pan Ding,
Pan Ning
Publication year - 2008
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.28392
Subject(s) - polyacrylonitrile , phase diagram , cloud point , spinning , ternary operation , materials science , ternary numeral system , thermodynamics , fiber , phase (matter) , dimethylformamide , polymer chemistry , polymer , composite material , chemistry , solvent , physics , organic chemistry , computer science , pulmonary surfactant , programming language
Experimental cloud‐point data were obtained by cloud‐point titration. The phase diagram for a ternary system of water–dimethylformamide–polyacrylonitrile was determined by numerical calculation on the basis of the extended Flory–Huggins theory and was found to agree well with the cloud‐point data. To construct the theoretical phase diagram, three binary interaction parameters were obtained with different methods. The ternary phase diagram was used to investigate the mechanism of fiber formation. The skin–core structure and fingerlike pores in polyacrylonitrile fiber may be effectively eliminated if the composition of the spinning solution is properly chosen, and consequently, homogeneous polyacrylonitrile fiber with a bicontinuous structure and good mechanical properties can be obtained through the spinning process. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008