CHAIN-EXTENDED POLYURETHANE ANIONOMERS USING IONIC DIOLS OF VARYING METHYLENE SPACERS

Ionic diols with varying methylene spacers were prepared from maleic a nhydride and linear diols. Reaction across the unsaturated site by aqu eous sodium bisulphite was used to prepare the ionic diols. Chain exte nded polyurethane ionomers were prepared by the reaction of prepolymer based on different polyols and diisocyanates with the ionic diols. Th e polyurethane anionomers were characterized by FT-IR and FT-NMR spect roscopy. The differential scanning calorimetric results show that T-g of the anionomers shifted towards low values as the ionic content in t he polyurethane increases and as the length of the ionic diol increase s. (C) 1996 John Wiley & Sons, Inc.