Synthesis and characterization of a novel kind of thermotropic liquid crystalline poly(urea-ester)s based on bis(4′-hydroxyphenyl)-tolyene-2,4-diurea

✍ Scribed by Zhuwei Du; Teng Qiu; Qixiang Zhou; Xiaogong Wang; Deshan Liu

• Publisher: John Wiley and Sons
• Year: 2001
• Tongue: English
• Weight: 629 KB
• Volume: 82
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1885

✦ Synopsis

Abstract

A new diphenol monomer bis(4′‐hydroxy‐phenyl)‐tolyene‐2,4‐diurea was synthesized by reaction of 2,4‐toylene diisocyanate with p‐aminophenol in N,N‐dimethylformamide (DMF). The product was characterized by elemental analysis (EA), differential scanning calorimetry (DSC), and ^1^H‐NMR. And a novel kind of liquid crystalline poly(urea‐ester)s were obtained by using this monomer. By using a polarizing microscope with hot stage (POM), wide‐angle X‐ray diffraction (WAXD) and small‐angle X‐ray diffraction (SAXD) the polymers were proven to be nematic liquid crystal. The result of DSC showed that the effect of the monomer composition on the melting point of poly(urea‐ester)s was significant. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 82: 577–583, 2001