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Palladium Complexes Of Side‐chain Liquid Crystal Polymers With T‐shaped Two‐dimensional Mesogenic Units
Published 2002 · Materials Science
A series of liquid crystal polymers (LCPs) with T-shaped two-dimensional mesogenic units were synthesized via solution polycondensation. The LCPs were used as ligand polymers to coordinate with palladium dichloride, by which a series of polymeric palladium complexes were prepared. The liquid crystalline behaviors of the compounds were characterized using differential scanning calorimetry, polarized microscopy and X-ray diffraction. The entire palladium complexes went to liquid crystal phase when heated to their melting temperature (Tm), and a threaded texture was observed. The melting point of all the complexes changes regularly with the increase of the end alkoxy group length and the flexible spacer unit in the ligand polymer. It is worth noting that some of the complexes without end substituent groups in the ligand polymer were also found to show liquid crystal behaviors, which would be a subject for further investigation. Copyright © 2001 John Wiley & Sons, Ltd.