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10.1 From Flory-Huggins theorvt the partial molar Gibbs free energv of mixing with respect to the solvent for the formation of a polymer solution is

From Flory-Huggins theory, the partial molar Gibbs free energy of mixing with respect to the solvent for the formation of a polymer solution is given by:2.png

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10.1 From Flory-Huggins theorvt the partial molar Gibbs free energv of mixing with respect to the
solvent for the formation of a polymer solution is given bv: 1
#1-#?= at" Intel) = RTIIn¢1+(1 — x—)¢2 + ml] 1‘!
Where this the volume fraction of polvmer, a:It is the number average ratio of the molar volume of the polvmer to that of the sohrentt o is activity, and x is the Flow—Huggins polvmer—solvent interaction
parameter. Use this equation to estimate I for solutions of natural rubber [MELSflDE gimoll in benzene given that the vapor pressure measurements showed that the activitvr in the solvent in a
solution with ¢2=fi25fl was 0.939. State anv assumptions that 1glrou make. [Note: natural rubber is cis- 1,4-polvisoprene] H

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