Metallo‐supramolecular Crosslinked Polyurethanes
Abstract
The effects of incorporating metal‐binding ligands as chain extenders in polyurethane elastomers were investigated. Segmented polyurethanes based on 2 kDa poly(tetramethylene oxide) (PTMO) and 4,4‐methylenebis(cyclohexyl isocyanate) were polymerized using a two‐step process in which 2,6‐bis(1‐ethyl‐5‐(methoxymethyl)‐1H‐benzo[d]imidazol‐2‐yl)pyridine was added as a chain extender. The resulting polyurethanes were then metallated using stoichiometric amounts of Zn(II) metal salts with different counterions. The resulting metallopolymers have substantially improved Young's moduli, increased failure stress, and improved thermomechanical behavior. The materials were microphase‐separated into anisotropic hard domains within a PTMO matrix. Simultaneous small‐angle X‐ray scattering and tensile testing revealed the minority hard segment domains remain relatively intact during elongation, likely due to the strength of the metal–ligand complex. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2019, 57, 1744–1757
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Nov 29, 2019
- Source ID
- 10.1002/polb.24909
Entities
People
- Alice M. Savage
- Brian Morgan
- Frederick L Beyer
- Robert H Lambeth
Organizations
- Argonne National Laboratory
- National Science Foundation
- Northwestern University
- United States Army Research Laboratory
- United States Department of Energy