中文摘要：

合成了4种以间苯二甲酸、间苯二酚为中心，硝基为端基的芳香酯类香蕉形液晶（M1～M4）。利用红外光谱（IR）、核磁共振谱（1HNMR）及元素分析对其分子结构进行了表征，通过差示扫描量热（DSC）、偏光显微分析（POM）、热重分析（TG）对其介晶性能、相行为及热稳定性进行了研究。结果表明，所合成的香蕉形化合物（M1～M4）均有液晶性，呈现树叶、马赛克、扇形、球粒及纹影织构；升、降温时的液晶区间分别为32．9～57．2℃（M1除外）与28．4～96．5℃；随着分子刚性增加，它们的tm、ti、tic值明显提高；该类物质热稳定性良好。5％热失亏温唐均在285℃以上．

英文摘要：

A series of novel banana-shaped liquid crystals M1-M4 based on isophthalic acid or resorcinal as a core and nitryl as terminal groups was synthesized by aromatic esterification. Their chemical structures were con- firmed by FT-IR, 1H NMR and elemental analysis, their mesomorphic properties and phase behavior were in- vestigated by differential scanning calorimetry （DSC）, polarizing optical microscopy （POM） and thermograrim- etric analyzer （TG） measurements. The results showed that M1-M4 were thermotropic liquid crystals. In meso- morphic state, they displayed dendritic, mosaic, fan-shaped, droplet and schlieren texture severally. The me- sophase range was 32.9-57.2℃ （except M1 ） during heating, while it was 28.4-96.5℃ during cooling. With in- creasing rigidity of M1-M4, their tm ,ti ,tic improved obviously. The temperatures when 5% weight loss occurred were higher than 285℃, which revealed that the synthesized banana-shaped liquid crystals M1-M4 had a high thermal stability.