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A series of liquid crystalline polymers with T-shaped two-dimensional mesogenic unitswere synthesized via low temperature solution polycondensation of 2-(4'-alkoxy-phenyl)hydroquinone with various diacyl dichlorides. The polymers were found to be nematic andshown thermotropic liquid crystalline behaviors through observations using DSC, polarizedmicroscopy and X-ray diffraction. The melting temperature T_m and the isotropizationtemperature T_i of the polymers change regularly with varying of the monomer structures. 相似文献
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通过改变与6FDA共缩聚的两种二胺单体的比例,在分子主链中引入具有庞大侧基的9,9-二苯基芴单元,然后和金属钌配合物进行配位,得剑了三个含金属钌配合物的三元聚酰哑胺BFPI-1-Ru,BFPI-2-Ru和BFPI-3-Ru.用元素分析、GPC、FT-IR、TG和UV-Vis等对其分子量、结构及性质进行了表征.结果表明,随9,9-二苯基芴单元含量的增加,含金属聚合物在低沸点溶剂CHCl_3和THF中的溶解性提高.所合成的含金属聚酰亚胺具有良好的热稳定性,在350~800nm较宽的紫外可见光区有良好的光吸收性质. 相似文献
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