Polyurethanes crosslinked by metals and their complexes with crown ether

• Published in: Journal of polymer science. Part A, Polymer chemistry Vol. 36; no. 9; pp. 1379 - 1386
• Main Authors: Kosyanchuk, L. F., Lipatova, T. E., Vilensky, V. A., Lipatov, Y. S., Shtompel, V. I.
• Format: Journal Article
• Language: English
• Published: New York John Wiley & Sons, Inc 15-07-1998; Wiley
• Subjects: Applied sciences; crown ether; Exact sciences and technology; Inorganic and organomineral polymers; metal complexes; Physicochemistry of polymers; polyrethanes; Preparation; X-ray scattering; Ionomer; Molecular structure; Organometallic copolymer; Crown compound; Crosslinking; Experimental study; Urethane copolymer; Polyaddition; Dielectric relaxation; Copper II Complexes; Preparation; Supramolecular structure; Cobalt II Complexes; Carboxylate copolymer
• ISSN: 0887-624X; 1099-0518
• DOI: 10.1002/(SICI)1099-0518(19980715)36:9<1379::AID-POLA5>3.0.CO;2-O

Two types of crosslinked polyurethanes (PU) have been synthesized: (a) PU crosslinked by metal ions (Cu2+ and Co2+), and (b) PU crosslinked by the complexes of metals with crown ether. Using X‐ray scattering under small and wide angles the peculiarities of the structure of networks have been investigated. It was found that PU crosslinked by the metal crown ether complexes have a looser structure because of the bulky crosslink and diminished molecular mobility of the chains between two crosslinks, as was proven by the dielectric spectroscopy method. The X‐ray and IR data have allowed proposing a scheme of the structure of the crosslinked PU with various types of crosslinks. The structures discovered may be considered as similar to metal catenandes. © 1998 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 36: 1379–1386, 1998