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Polyacetylenes Bearing Mesogenic Side Groups: Synthesis and Properties, 1. Mesogenic Substituents with a Short Flexible Spacer
Author(s) -
Stagnaro Paola,
Cavazza Barbara,
Trefiletti Vincenzo,
Costa Giovanna,
Gallot Bernard,
Valenti Barbara
Publication year - 2001
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 - 10.1002/1521-3935(20010601)202:10<2065::aid-macp2065>3.0.co;2-5
Subject(s) - mesogen , polymerization , monomer , polymer chemistry , polymer , side chain , biphenyl , metathesis , chemistry , ring opening metathesis polymerisation , materials science , organic chemistry , liquid crystalline
We report on the synthesis and polymerization of novel acetylenic monomers derived from 3‐butyn‐1‐ol and bearing different potentially mesogenic substituents. Polymerization is carried out in solution with typical metathesis catalysts based on Mo and W and yields polyacetylenes with fairly high molecular weight and soluble in common organic solvents. Polymers are fully characterized by the point of view of the molecular structure, by GPC, FT‐IR, NMR and UV/VIS techniques, and of the thermal and morphological behavior, by TGA, DSC, POM and X‐ray diffraction experiments. Polymers with different amounts of cis and trans units are obtained, depending upon polymerization conditions. Although the monomers do not show any liquid crystalline behavior, polymers P2 and P3 , containing in the side‐chain respectively biphenyl and benzoyloxy benzoate as mesogenic cores, exhibit an enantiotropic smectic phase.