LI Zifa, ZHANG Zheng, NING Chaofeng, ZHENG Shijun, ZHANG Shuyuan, ZHOU Qifeng, XIE Ren, ZHANG Dong. SYNTHESIS AND CHARACTERIZATION OF SEMETIC C PHASE LIQUID CYSTAL POLYMERS WITH MESOGENIC LATERALLY FIXED ONTO THE MAIN CHAIN[J]. Acta Polymerica Sinica, 1998,(4):412-418.
LI Zifa, ZHANG Zheng, NING Chaofeng, ZHENG Shijun, ZHANG Shuyuan, ZHOU Qifeng, XIE Ren, ZHANG Dong. SYNTHESIS AND CHARACTERIZATION OF SEMETIC C PHASE LIQUID CYSTAL POLYMERS WITH MESOGENIC LATERALLY FIXED ONTO THE MAIN CHAIN[J]. Acta Polymerica Sinica, 1998,(4):412-418.DOI:
A new series of semetic C phase liquid crystal polymers with mesogens laterally fixed onto the main chain was synthesized via low temperature solution polycondensation from 2
5 bis(p alkoxyl benzoloxy) hydroquinone and aliphatdiyl chloride with different structure.The low molecular weight compounds were analyzed by elemental analysis IR 1H-NMR and MS.The polymers were characterized by GPC DSC TG WAXD and polarizing microscope with heating stage.It was found that all the polymers went to liquid crystal phase when heated to their Tm.The Schlieren textyre or focal-conic texture can be observed.Temperature-variable X-ray diffraction realized that they are smectic c phase.Both Tm and Ti of all the polymers decreased with the increase of the end alkoxy group length and the flexible spacer unit in the polymers gets longer
the temperature range of the liquid crystal phase of the polymers becomes narrow.