Hexane cyclohexane mixture, thermodynamic

Carmona, F.J., Gonzalez, J.A., Carcia de la Fuente, I., Cobos, J.C., Bhethanabotla, V.R., Campbell, S.W. (2000) Thermodynamic properties of n-alkoxyethanols + organic solvent mixtures. XI. Total vapor pressure measurements for n-hexane, cyclohexane or n-hcptanc + 2-ethoxyethanol at 303.15 and 323.15 K. J. Chem. Eng. Data 45, 699-703. 

The above approach of using a diluent of an intermediate thermodynamic quahty during the polymerization of DVB has been intensively examined and, indeed, resulted in materials with enhanced proportions of mesopores. In order to create a rigid polymer of desired porosity, DVB (usually more than 30% in its mixture with styrenic co-monomers) must be copolymerized in the presence of a sufficient amount of a poor diluent (usually 100% or more of the volume of the co-monomers). Of crucial importance is the nature of the poor solvent. Besides cyclohexane, mixtures of a thermodynamically good solvent (ethylene dichloride, toluene, etc.) with precipitating media (hexane, octane, isooctane, higher aliphatic alcohols, etc.), taken in an appropriate proportion, can be applied. Microphase separation during the suspension copolymerization of such a mixture should take place when the major part of the co-monomers has converted into polymer. 

Nonpolar + Nonpolar mixtures Figure 17.3 summarizes the excess thermodynamic properties for (cyclohexane + hexane) mixtures.J 4 We have chosen this... 

A recent study performed by Mello et al. focuses on a comparison of n-hexane and cyclohexane in the polymerization of BD with the catalyst system NdV/D I BAH/f BuCl. In this study Mello et al. use the pure solvents and mixtures of n-hexane and cyclohexane [423]. Cyclohexane yields BR with a significantly lower molar mass than n-hexane. According to Mello et al. this effect is due to the thermodynamically better solvent quality of cyclohexane. The authors found no strong influence of the cyclohexane/n-hexane ratio neither on catalyst activity nor on microstructure. 

Takigawa, T. Ohba, M. Ogawa, H. Murakami, S. Thermodynamic properties of binary mixtures of hexane isomer and cyclohexane at 298.15 K Fluid Phase Equilib. 2003,204 119-130... 

---