Accession Number:

ADA390976

Title:

Microphase Separation in Ion Containing Polyurethanes

Descriptive Note:

Final progress rept. 1 Sep 1996-31 MAr 2001

Corporate Author:

DELAWARE UNIV NEWARK DEPT OF CHEMICAL ENGINEERING

Personal Author(s):

Report Date:

2001-04-15

Pagination or Media Count:

16.0

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.

Subject Categories:

  • Polymer Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE