ZHANG, Shuyuan, DENG Gang, LI Zifa, ZHENG Shijun. SYNTHESIS AND CHARACTERIZATION OF A SERIES OF THE LIGANDS OF LIQUID CRYSTAL POLYEMERS WITH T-SHAPED TOW-DIMENSIONAL MESOGENIC UNITS[J]. Acta Polymerica Sinica, 1999,(3):266-273.
ZHANG, Shuyuan, DENG Gang, LI Zifa, ZHENG Shijun. SYNTHESIS AND CHARACTERIZATION OF A SERIES OF THE LIGANDS OF LIQUID CRYSTAL POLYEMERS WITH T-SHAPED TOW-DIMENSIONAL MESOGENIC UNITS[J]. Acta Polymerica Sinica, 1999,(3):266-273.DOI:
A new series of the ligands of liquid crystal polymers with T-shaped two-dimensionl mesogens was synthesied by solution condensation polymerization by using 4
4'-(
-alkylenedioyloxy)-dibenzol dichlorids with 2
4-dihydroxy-4]'-alkoxyl azobenzene as the monomers. The low molecular weight compounds were analyzed by elementary analysis
IR
1H-NMR and MS. The ligands were characterized by GPC
DSC
TG
WAXD and polarizing microscopy with a heating stage. It was found that all the ligand of polymers went to liquid crystal phase when heated to their Tm
the threaded texture ands schlieren texture can be observed.Both Tmand Ti of all the ligands change regulary with the increase of the end alkoxy group length and when the flexible spacer unit in the ligand gets longer.It is worth specially being noted that some of the ligands having no end substituent groups were also found to show liquid crystal behaviors
which would be a new subject for further research on the formation mechanism and the texture of such kind of the ligands.