Benzene-rubber vapour pressure

Figure 9.7 Comparison of experimental and calculated vapour pressures of benzene in benzene-rubber mixtures [7],...

Fig. 25.8 shows the vapour pressure of benzene in the system benzene + rubber, as a function of the volume fraction defined by... 

Fig, 25.8. Vapour pressure of benzene in the system rubber + benzene. 9 = volume fraction of benzene,... 

To compare the vapour pressure of solutions of rubber in benzene with the Flory-Huggins formula. 

The vapour pressure of solutions of rubber in benzene has been measured at 25 C bj Gee and his collaborators (Gee and Treloar, Trans. Faraday Soc. 1942, 38,147 Gee and Orr, Trans. Faraday Soc. 1946,42, 507 supplemented by private communication from Dr. Gee). Values of the ratio of the vapour pressure f of the solution to the vapour pressure of pure benzene for various values of the volume fraction q> of rubber are given in table 1. 

Use this equation to calculate an estimate of x lor solutions of natural rubber (A7 = 2.5 X lO g moP ) in benzene given that vapour pressure measurements showed that the activity of the solvent in a solution with 2 = 0.250 was 0.989. 

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