✦ LIBER ✦

Synthesis and characterization of poly(urethane-co-imidine)s having pendent phenyl and benzylidene groups using bisphthalides, bislactones and blocked polyurethane prepolymers

✍ Scribed by N Padmanabha Iyer; A Sultan Nasar; T Philip Gnanarajan; Ganga Radhakrishnan

Publisher: John Wiley and Sons
Year: 2001
Tongue: English
Weight: 135 KB
Volume: 50
Category: Article
ISSN: 0959-8103
DOI: 10.1002/pi.685

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✦ Synopsis

Abstract

Poly(urethane‐co‐imidine)s were prepared using amine blocked polyurethane (PU) prepolymer. The PU prepolymer was prepared by the reaction of poly(propylene glycol) (PPG~2000~) and 2,4‐tolylene diisocyanate (TDI) and end capped with N‐methyl aniline. The PU prepolymer was then reacted with __bis__phthalides and __bis__lactones, until the evolution of carbon dioxide ceased. Polymerization reactions with __bis__pthalides and __bis__lactone took more time than with dianhydrides. Polymers were characterized by FTIR, GPC, TG and DSC analyses. Molecular weights of the poly(urethane‐co‐imidine)s were found to be lower than that of poly(urethane‐co‐imide)s. Compared to poly(urethane‐co‐imide)s all poly(urethane‐co‐imidine)s showed high glass transition temperature and crystallization peak in DSC. The thermal stability of the polyurethanes was found to increase with the introduction of imidine component.