Untersuchungen �ber die Stabilit�t von Organosolen

The Fractionation of High-Polymeric Substances.

“…Polymethacrylic esters (80) behaved like cellulose acetate; with benzyl cellulose (80) a maximum precipitating power is shown by hexanol. Even more significant than its correlation with molecular polarization is the relationship of precipitating power to the quantity µ2/e where µ is here the dipole moment and e the dielectric constant; this relationship is approximately linear in many cases (80,82). Similar studies have been made by several other workers (105,146,175,286,303).…”

“…Since the molecular polarization increases with the molecular weight of the alcohol, this means that the higher alcohols are more effective than the lower ones in precipitating cellulose acetate (which contains polar groups), but less effective in precipitating the non-polar substances paraffin and rubber. In later work, polystyrene (82), polyvinyl chloride (80), and polyisobutylene (80) were found to behave like paraffin and rubber in this respect. Polymethacrylic esters (80) behaved like cellulose acetate; with benzyl cellulose (80) a maximum precipitating power is shown by hexanol.…”

Production of Clinical-Type Dextran - Partial Hydrolytic Depolymerization and Fractionation of the Dextran from Leuconostoc mesenteroides Strain NRRL B-512

“…The sensitivity of the precipitation is in the reverse order, as precipitation of 95% of the dextran from solution required a 10.8% range of methanol, and 7.4 and 7.1% ranges of absolute ethanol and 2-propanol, respectively. These relationships are expressed quantitatively in Table VIII, in which it can be seen that the relative (to methanol) precipitating powers of the alcohols used (a) did not vary greatly over the entire range of precipitation, (6) were related to the molecular weight of the hydrocarbon radical of the alcohol used, and (e)…”

“…were correlated with electrical properties of the precipitantnamely, its molar polarization (6) and the quantity #i2/e, where µ is the dipole moment and e is the dielectric constant of the precipitant. These results on the relative precipitating power of the alcohols are generally similar to those of Erbring and Wenstop (6') Nature of the Precipitated Phase.…”

“…KENNETH A. KOBE AND EARL J. COUCH, JR., University of Texas, Austin, Tex. THE usefulness of the enthalpy-concentration diagram in making refrigeration, crystallization, and evaporation calculations for salt solutions has been pointed out by Bosnjakovic (6) and McCabe (26). In view of the importance of the system ferrous sulfate-water in connection with processes for the recovery of waste pickle liquor, it is desirable to have such a diagram for this system.…”