Structural Influences of COMB-HERUs on Aqueous Solution Viscosities

摘要

The influence of molecular weight,dissocyanate hydrophobicity,hydrophobe size and ethylene oxide spacer lengths on the solution properties of S-G Comb-HEUR thickeners are examined.The fluorescence data follow expected behavior,but therre are surprising influences in the elastic response of the thickened fluids,contrasting with that observed in telechelic HEURs.Greater efficiency is observed with terminal hydrophobe placement on Comb polymers (Figure 5).