Gas-liquid chromatography on polymers. I. Polyisobutylene-hydrocarbons at 25.deg.

摘要: Abstract The Flory—Huggins mixing parameters χ, obtained by glc agree closely with those derived extrapolation of results from static vapor sorption and osmometry for the systems PIB—n-pentane PIB—n-octane. Substantial discrepancies between two are observed PIB—benzene PIB—cyclohexane. It is not clear at this early stage whether indicates specific interactions solvent polymer, including surface adsorption, or if there large inaccuracies in data low concentrations solvent. As we noted above, consideration measurements, it does seem likely that latter possibility cause great concern. Instead, inclined to view interactions, more general geometrical contraints on cavity formation, operating these highly concentrated solutions. Since X12 values enthalpies so n-alkanes, have further evidence remarkable acc...