Polyurethanes crosslinked by metals and their complexes with crown ether

✍ Scribed by L. F. Kosyanchuk; T. E. Lipatova; V. A. Vilensky; Y. S. Lipatov; V. I. Shtompel

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 201 KB
• Volume: 36
• Category: Article
• ISSN: 0887-624X
• DOI: 10.1002/(sici)1099-0518(19980715)36:9<1379::aid-pola5>3.0.co;2-o

✦ Synopsis

Two types of crosslinked polyurethanes (PU) have been synthesized: (a) PU crosslinked by metal ions (Cu 2/ and Co 2/ ), 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.