A series of novel optical active shish-kebab type liquid-crystalline copolymers was synthesized via solution polycondensation of terephthaloyl chloride with 2
5-bis\[4-(S)-2-methyl butoxy) benzoyloxy\] hydroquinone and hexandiol.The copolymers were characterized by GPC、DSC、TG、WAXD、polarizing microscope and rotational analysis instrument.It was found that all the copolymers change to liquid crystal phase when heated to their Tm.The broken focal-conics texture or sanded texture can be observed. Temperature-variable X-ray diffraction realized that they are chiral smetic C(S*C) phase. Both melting temperatures (Tm) and isotropization temperatures (Ti) change regularly with varying the hexandiol content in the copolymers. It was found that the rotation was maintained during the synthesis process and all the chiral copolymers were optically highyl active.
SYNTHESIS AND CHARACTERIZATION OF LIQUID CRYSTALLINE COPOLYESTERS WITH X-SHAPED TWO-DIMENSIONAL MESOGENIC UNITS AND CROWN ETHER CYCLE OF cis-4,4′-BIS(4-HYDROXY PHENYLAZO)DIBENZO-18-CROWN-6
SYNTHESIS AND CHARACTERIZATION OF POLYBENZO-BISOXAZOLES CONTAINING SOFT SEGMENTS
SYNTHESIS AND CHARACTERIZATION OF LIQUID CRYSTALLINE COPOLYESTERS WITH X-SHAPED TWO-DIMENSIONAL MESOGENIC UNITS AND CROWNETHER CYCLES OF trans-4,4′-BIS(4-HYDROXY-PHENYLAZO)DIBENZO-18-CROWN-6
SYNTHESIS AND CHARACTERIZATION OF LIQUID CRYSTALLINE COPOLYESTERS WITH X-SHAPED TWO-DIMENSIONAL MESOGENIC UNITS AND CROWNETHER CYCLE OF cis-4,4′-BIS(4-HYDROXY PHE- NYLAZO)DIBENZO-14-CROWN-4
SYNTHESIS AND CHARACTERIZATION OF SCHIFF BASE TYPE LIQUID CRYSTALLINE POLYMERS WITH CROWN ETHER CYCLE