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Functional liquid‐crystalline polyesters based on twin nonamethylene spaced p ‐oxybenzoate dyads and dithiols
Author(s) -
Angeloni A. S.,
Chiellini E.,
Galli G.,
Laus M.,
Torquati G.
Publication year - 1989
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19890240131
Subject(s) - thermotropic crystal , mesogen , liquid crystal , methylene , polyester , materials science , polymer , phase (matter) , dithiol , phase transition , crystallography , polymer chemistry , liquid crystalline , chemistry , organic chemistry , composite material , thermodynamics , physics , optoelectronics
A new series of thermotropic liquid‐crystalline poly‐(ester‐β‐sulphide)s 9Sn was prepared by reacting the mesogenic nona‐methylene bis[4‐(4‐acryloyloxybenzoyloxy)benzoate] 1 with α,ω‐alka‐nedithiols of varying length. The polymers exhibit nematic and smectic mesophases, which are enantiotropic or monotropic in character, depending on the number n of methylene units in the dithiol precursor (n = 2–10). The phase transition parameters were determined and compared with those of closely related poly(ester‐β‐sulphide)s 6Sn. It is suggested that these systems may be suitable model polymers to test current theory of the existence of highly anisotropic or weakly anisotropic mesophases in polymers.