Abstract
Two types of urethane ionomers (cationomers and anionomers) were prepared and their structure - properties relationships examined. The mechanical properties and glass transition temperatures (Tg) of urethane cationomers increased with decreasing molecular weight of the polyols, and increasing concentrations of quaternary ammonium ions and degree of quatemization. The mechanical properties and Tg's of the cationomers decreased when isophorone diisocyanate (1PDI) was substituted by 4,4'-methylene bis(phenylisocyanate) (MDI). Comparing a series of N-alkyldiethanolamine chain extenders in urethane cationomers, N-methyldiethanolamine (N-MDEA) based - cationomers exhibited the best properties.
Both mechanical properties and Tg's of urethane anionomers increased with increasing ionic potential (φ) or charge-to-distance ratio (q/a) in non-transition mono-and divalent metals based anionomers. However, no relationship between φ or q/a and mechanical properties or Tg's could be established in the transition divalent metals - based anionomers.
Some interesting applications of urethane ionomers in foams and coatings were investigated which show many potential applications of urethane ionomers in various industries.
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