Interfacial tension of demixed polymer solutions near the critical temperature: polystyrene + methylcyclohexane |
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Authors: | Kenji Shinozaki Truong van Tan Yuichi Saito Takuhei Nose |
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Affiliation: | Department of Polymer Chemistry, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152, Japan |
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Abstract: | Interfacial tension between demixed solutions of polystyrene + methylcyclohexane has been measured near the critical temperature as a function of temperature using polystyrenes with molecular weights 9000 ~ 1.26 × 106. The critical exponent for the interfacial tension was determined to be about 1.30 for the lower molecular weight systems. However, for higher molecular weights the exponent could not be obtained because the system departed from critical behaviour. Magnitudes of the interfacial tension were proportional to about N?0.44, where N is the polymerization index. Experimental results were compared with the recently-proposed theories and found to be in qualitative agreement. The tricritical theory of polymer solutions was also compared with the experimental results. |
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Keywords: | Interfacial tension polymer solution critical temperature critical behaviour polymerization index molecular weight dependence tricritical theory |
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