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The measurement of coexistence curves for {x(CHCOOC2H5)2+(1−x) CH3(CH2)7CH3} in the critical region

✍ Scribed by Xueqin An; Jiong Yang; Weigou Shen

Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
161 KB
Volume
30
Category
Article
ISSN
0021-9614

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✦ Synopsis

Coexistence curves for binary liquid mixtures of x CHCOOC H q 1 y 2 5 2 . Ž . 4 x CH CH CH have been determined by measurement of the refractive index. The 3 2 7 3 experimental results have been used in the determination of the critical exponent ␤ and the critical amplitude B, and the study of the diameters of the coexistence curves. The values of the critical exponent ␤ are found to be consistent with theoretical predictions. The coexistence curves have been successfully described by a combination of the Wegner equation and the Ž . y r expression for the diameter. The exponents r and b in the relations 1 y r A M and c c y 1 .865 yb Ž . B A M , where is the critical volume fraction of CHCOOC H , have been c c 2 5 2 Ž . Ž . found to be 0.42 " 0.01 and 0.31 " 0.04 , respectively, consistent with observations from experimental studies for other chain-molecule solution systems, and support the Landau᎐Ginsburg᎐Wilson type model we proposed recently.

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