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以4,4-′(α,ω己二酰氧)二苯甲酰氯(M1)、2,5-二(对辛氧基苯甲酰氧基)氢醌(M2)和反式4,4′-双(4羟基苯基偶氮)二苯并18冠6(M3)为单体,通过溶液共缩聚反应,合成了一系列含X型二维液晶基元和反式4,4′双(4羟基苯基偶氮)二苯并18冠6冠醚环的主链型液晶共聚酯.共聚酯的分子量不高,[η]在0.37～0.25dL g之间.单体的化学结构通过IR、UV、H NMR、MS和元素分析等方法确证.共聚酯的外观为黄色粉状固体,除CP9外,室温下不溶于CHCl3和THF溶剂.共聚酯的性质采用GPC、[η]、DSC、TG、WAXD和POM等方法进行了研究.发现所有的共聚酯加热到各自的熔融温度以上都能形成液晶态,在液晶态可以观察到近晶相的镶嵌织构或焦锥织构或破扇型织构和向列相的球粒织构或丝状织构或纹影织构.共聚酯的熔融温度(Tm)和各向同性温度(Ti)随共聚酯分子中反式4,4′双(4-羟基苯基偶氮)二苯并18冠6用量的改变呈规律性变化.WAXD研究进一步证实了共聚酯的液晶性.
(4,4’-bis (p-octoxybenzoyloxy) hydroquinone (M2) and trans-4,4 ’- bis (4 - hydroxyphenylazo) dibenzyl 18 crown 6 (M3) as monomers, a series of X - containing two - dimensional liquid crystal motifs and trans 4,4’ (4-hydroxyphenylazo) dibenzo-18-crown-6 crown ether ring copolyester.The copolyester has a low molecular weight [η] between 0.37 and 0.25 dL g, monomer chemistry The structure was confirmed by IR, UV, H NMR, MS and elemental analysis. The appearance of the copolyester was yellow powdery solid, except CP9, insoluble in CHCl3 and THF solvent at room temperature. The properties of the copolyester were determined by GPC, η], DSC, TG, WAXD and POM, etc. All of the copolyesters were found to be liquid crystalline when heated to above their respective melting temperatures and inlaid textures Conical texture or broken fan-like texture and nematic phase of pellet texture or filamentous texture or textured texture copolyester melting temperature (Tm) and isotropic temperature (Ti) with the copolyester Molecular changes in the trans-4,4 ’bis (4-hydroxyphenylazo) dibenzo 18 crown 6 dosage was changed Regular changes. WAXD study further confirmed the liquid crystallinity of the copolyester.