Microphase Separation in Ion Containing Polyurethanes
Abstract
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 15, 2001
- Accession Number
- ADA390976
Entities
People
- Sachin S Velankar
- Stuart L. Cooper
Organizations
- University of Delaware