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Aqueous dispersion of polyurethanes containing ionic and nonionic hydrophilic segments
Author(s) -
Kim Byung Kyu,
Lee Young Min
Publication year - 1994
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.1994.070541204
Subject(s) - isophorone diisocyanate , ultimate tensile strength , materials science , emulsion , polyurethane , polyethylene glycol , polypropylene glycol , polymer chemistry , peg ratio , diol , aqueous solution , chemical engineering , particle size , dispersion (optics) , ionomer , composite material , copolymer , organic chemistry , chemistry , polymer , physics , finance , optics , engineering , economics
Aqueous polyurethane (PU) dispersions were prepared from isophorone diisocyanate (IPDI), polytetramethylene glycol (PTMG), polypropylene glycol (PPG), polyethylene glycol (PEG), and dimethylol propionic acid (DMPA) as anionic center. The effects of the PEG/PTAd mixing ratio, type of polyether polyols, and hard segment content on the state of dispersion, surface, dynamic, and tensile properties of emulsion‐cast film were determined. With more incorporation of nonionic hydrophilic PEG, particle size of the emulsion and tensile strength of the emulsion‐cast film decreased, while the emulsion viscosity and elongation at break increased. Among ether type polyols, PTMG‐based PU generally showed superior mechanical properties. With increasing hard segment content, particle size, storage modulus ( E′ ), and tensile strength increased. At the lowest hard segment content (36 wt %) tested in this experiment, soft segments crystallized and water swell decreased. © 1994 John Wiley & Sons, Inc.