Microphase Separation in Ion Containing Polyurethanes
Final progress rept. 1 Sep 1996-31 MAr 2001
DELAWARE UNIV NEWARK DEPT OF CHEMICAL ENGINEERING
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We have studied the-viscoelastic behavior of polyurethane melts to obtain a greater fundamental understanding of phase separation in multiblock polyurethane copolymers with coulombic and coordination interactions. Two series of non-crystallizable aliphatic polyurethanes and its cationmers that flow at relatively low temperatures and are more thermally stable than commercial materials were synthesized. The effects of three principal parameters block length N, block incompatibility chi, and composition on microstructure and rheological properties of polyurethane elastomers were examined. A separate part of this report involves synthesis and characterization of polyurethanes with monodisperse, hydrophobic soft segments. We have prepared and evaluated the mechanical and solvent sorption properties of a series of polyurethane elastomers based on three different types of soft segments with five different molecular weights. Both mechanical and solvent sorption properties are found to be dependent on hard segment content. hard segment chemistry, properties of the polyol, and the order of the hydrogenation and polymerization reactions.
- Polymer Chemistry