Molecular polarisability. The apparent dipole moments and molar Kerr constants of six polypropylene glycols as solutes in benzene

Abstract

Empirical relations between x in HO[–CH₂·CHMe·O–]_xH and various physical properties needed for the evaluation of molar refractions, polarisations, Kerr constants, and dipole moments are deduced for polypropylene glycols (PPGs) having molecular weights from ca. 400 to ca. 4000. The inversions in algebraic sign, noted previously with polyethylene glycols, and now recorded for PPGs, are easily explained if slight angular distortions occur in the C·C·O·C backbones of the two polymers as the segment numbers X are increased.