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A novel synthetic strategy to aromatic‐diisocyanate‐based waterborne polyurethanes
Author(s) -
Wei Xin,
Ying Yan,
Yu Xuehai
Publication year - 1998
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/(sici)1097-4628(19981121)70:8<1621::aid-app20>3.0.co;2-o
Subject(s) - prepolymer , polyurethane , isocyanate , polyol , hexamethylene diisocyanate , polymer chemistry , materials science , emulsion , aqueous solution , isophorone diisocyanate , amine gas treating , dispersion (optics) , polyurea , chemical engineering , chemistry , organic chemistry , composite material , physics , optics , engineering
Based on aromatic diisocyanate [e.g., 2,4‐tolylene diisocyanate (TDI)], a novel synthetic strategy to waterborne polyurethanes was introduced. Ionized polyoxyethylated amine (NPEO) played an important role in the preparation process as both a polyether soft segment and an internal emulsifier. First, a segmented surfactant prepolymer was synthesized. Second, the prepolymer was charged to a water dispersion of a hydrophobic polyol [e.g., polytetrahydrofuran (PTMO)] directly to obtain a stable emulsion. Third, a chain‐extension procedure was performed directly in water with PTMO to achieve a stable aqueous polyurethane dispersion. Neither aliphatic diisocyanate nor excess isocyanate group fraction was added. An extra end‐capping reaction or external emulsifier was also unnecessary. Films cast from emulsions exhibited reasonable mechanical properties. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 70: 1621–1626, 1998