4-methyl-2-pentanol surface tension

The styrene (Polysciences) was washed with 10 aqueous sodium hydroxide to remove the inhibitor and vacuum-distilled under dry nitrogen the 1-pentanol (Fisher Scientific) was dried over potassium carbonate and vacuum-distilled the potassium persulfate (Fisher Scientific) was recrystallized twice from water the 2,2 -azobls(2-methyl butyro-nltrlle) (E. I. du Pont de Nemours) was recrystallized twice from methanol the sodium dodecyl sulfate (Henkel) was used as received its critical micelle concentration measured by surface tension was 5.2 mM. Dlstllled-delonlzed water was used in all experiments. 

Fig. 8.6. Pure O2/N2 permeance ratio of asymmetric poly(phenylene oxide) membranes as a function of surface tension of chloroform/nonsolvent additives mixtures. Nonsolvent additives include 2-ethyl-l-hexanol (1m), 1-octanol (2m), 2-propanol (3d), 2-decanol (4m), 3,5,5-trimethyl-1-hexanol (5m), 2,4-dimethyl-3-pentanol (6d), 2,4,4-trimethyl-1-pentanol (7d), 2-methyl-3-hexanol (lOd), 3-ethyl-3-pentanol (12m), and 2-methyl-2-hexanol (13d). Merged is indicated by m discrete is indicated by d. Reprinted from [22], with kind permission from J.Tan...

In Figure 44, the use of 2-ethyl-l-hexanol, 1-octanol and 2-decanol as nonsolvent additives produces higher surface tensions resulting in higher pure O2/N2 permeance rate ratios. On the other hand, lower surface tensions resulting in lower pure O2/N2 permeance rate ratios are reflected in the use of 2-propanol, 2,4-dimethyl-3-pentanol, 2-methyl-3-hexanol and 2-methyl-2-hexanol as nonsolvent additives. 

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