New polymer syntheses. Part 7. New unsaturated polyurethanes: synthesis and characterization

✍ Scribed by Aly, Kamal I

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 416 KB
• Volume: 48
• Category: Article
• ISSN: 0959-8103
• DOI: 10.1002/(sici)1097-0126(199909)48:9<773::aid-pi213>3.0.co;2-7

✦ Synopsis

A novel series of polyurethanes was prepared via step-growth solution polymerization, by reaction of arylidene monomers, e g 2,5 bis(4-hydroxybenzylidene)cyclopentanone (I), 2,5-divanillylidenecyclopentanone (II), 2,6-bis(4-hydroxybenzylidene)cyclohexanone (III), 2,6-divanillylidenecyclohexanone (IV) or 2,7-bis(4-hydroxybenzylidene)cycloheptanone (V) with diisocyanates such as toluylene diisocyanate and methylene bis(4-phenylisocyanate). To characterize these polymers, the corresponding model compounds were prepared from monomers I±V and phenylisocyanate. The polymers were characterized by reduced viscosity measurements, IR spectroscopy, 1 H NMR, solubility and determination of their crystallinity. Characterization of the model compounds was accomplished by elemental analysis, IR and 1 H NMR spectroscopy. The thermal stabilities of the polymers were evaluated by thermogravimetric analysis. The morphology of one of these polymers was examined by scanning electron microscopy.