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Synthesis and characterization of a novel kind of thermotropic liquid crystalline poly(urea‐ester)s based on bis(4′‐hydroxyphenyl)‐tolyene‐2,4‐diurea
Author(s) -
Du Zhuwei,
Qiu Teng,
Zhou Qixiang,
Wang Xiaogong,
Liu Deshan
Publication year - 2001
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1885
Subject(s) - thermotropic crystal , differential scanning calorimetry , monomer , liquid crystal , polymer chemistry , melting point , materials science , urea , dimethylformamide , condensation polymer , polymer , crystallography , organic chemistry , chemistry , liquid crystalline , composite material , physics , optoelectronics , solvent , thermodynamics
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