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Study of the effect of PEG length in Uni‐HEUR thickener behavior
Author(s) -
Barmar Mohammad
Publication year - 2008
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.29192
Subject(s) - peg ratio , isocyanate , aqueous solution , viscosity , ethylene glycol , materials science , polymer chemistry , chemical engineering , rheology , chemistry , composite material , organic chemistry , polyurethane , finance , engineering , economics
Four new models of Uni‐HEUR associative thickener were designed and synthesized using various molecular weights of poly(ethylene glycol) (PEG) as hydrophilic segments. The PEG chain ends were capped with octadecyl isocyanate as hydrophobic segments. The structure of the prepared Uni‐HEUR thickeners was confirmed by infrared spectroscopy. The steady shear viscosity measurements of aqueous solution of HEUR models showed that the relative size of hydrophilic segments to hydrophobic segments is very important. Oscillatory measurements confirmed the steady shear viscosity results. It is found, there is an optimum relative size of hydrophilic segments to hydrophobic segments to achieve the thickener with a good performance. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2009