Thermodynamic study of a water–dimethylformamide–polyacrylonitrile ternary system |
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Authors: | Lianjiang Tan Ding Pan Ning Pan |
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Affiliation: | 1. State Key Laboratory for Chemical Fiber Modification and Polymer Materials, Donghua University, Shanghai 201620, People's Republic of China;2. Biological and Agricultural Engineering Department, University of California, Davis, California 65616 |
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Abstract: | 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 |
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Keywords: | fibers mixing phase behavior thermodynamics |
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