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Liquid‐crystalline main‐chain polymers with a poly( p ‐phenylene terephthalate) backbone, 8. Synthesis and characterization of polyesters with 3‐ethoxypropoxy and 6‐(pentyloxy)hexyloxy side chains
Author(s) -
Mercx Frans P. M.,
Tinnemans Alois H. A.,
Damman Sebastiaan B.
Publication year - 1994
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.1994.021950415
Subject(s) - side chain , mesophase , alkoxy group , polyester , differential scanning calorimetry , polymer , polymer chemistry , phenylene , liquid crystal , materials science , methylene , glass transition , condensation polymer , chemistry , crystallography , organic chemistry , composite material , alkyl , optoelectronics , physics , thermodynamics
The influence of replacing a methylene group in the middle of the side chain of alkoxy‐substituted poly( p ‐phenylene terephthalate)s by an oxygen atom was investigated by differential scanning calorimetry (DSC), rheological measurements and X‐ray diffraction. Due to the presence of the oxygen atom the side chains of the polymer with long side chains (PTA12(O)HQ) lose their ability to crystallize. Except for this difference and a shift of the transition temperatures to lower temperatures, this polymer shows a similar phase behaviour compared to the corresponding alkoxy‐substituted polyester PTA12HQ. The polymer with short side chains, PTA6(O)HQ, shows a similar behaviour as the corresponding polymer without an extra oxygen atom, PTA6HQ. Only the transition to the nematic mesophase is shifted to lower temperatures.