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Tailoring the Phase Behavior in Thermotropic Copolyesters
Author(s) -
MartínezGómez Aránzazu,
Pérez Ernesto,
Bello Antonio
Publication year - 2011
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201100141
Subject(s) - thermotropic crystal , copolymer , materials science , copolyester , phase (matter) , amorphous solid , crystallography , isotropy , polymer chemistry , chemical engineering , liquid crystalline , polymer , polyester , chemistry , organic chemistry , composite material , optics , physics , engineering
The phase behavior of copolyesters from TEB and TEN is studied by DSC and real‐time synchrotron XRD. Results show that the phase behavior can be tailored by an appropriate selection of the composition. The sequence of phases isotropic‐SmA‐SmC is observed in copolymers with TEN content below ≈10 mol%, while only isotropic‐SmA phases are found for TEN content between 10 and 30 mol%. The copolymer P(TEB ‐co‐ 30 TEN) can be easily quenched into the amorphous phase or annealed to generate the liquid crystalline structure. At a TEN content >30 mol% the liquid‐crystalline phase is kinetically disfavored and is not observed. The PTEN homopolymer exhibits three‐dimensio3l crystalline structures. Mesophases in the copolymers are stable without transformation into 3D crystalline structures.