Effect of solvent and temperature on intrinsic viscosity

Effect of solvent and temperature on intrinsic viscosity. Kurata, Utiyama, and Kamada (69) have compared the intrinsic viscosity of PTHF in several different solvents at the same temperature. Some of their results are shown in Table 11. 

Sample Ethyl acetate 30° C Benzene 30° C Cyclohexane 30° C Theta mixture 31.8° C 

Viscosities in benzene, the most commonly used solvent, tend to be higher than in the other solvents and increase very rapidly with increasing molecular weight. This suggests that benzene is too good a solvent. A poorer solvent such as ethyl acetate would be a rviser choice. 

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