以硝基为端基的香蕉形液晶的合成与性能  

Synthesis and properties of banana-shaped liquid crystalline compounds with terminal nitryl groups

作　　者：姚丹姝[1] 王娜[1] 何晓智[1] 张宝砚[1] 

机构地区：[1]东北大学理学院,辽宁沈阳110004

出　　处：《功能材料》2012年第13期1774-1777,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(51174055);中央高校基本科研业务专项资金资助项目(N110705001);辽宁省博士启动基金资助项目(20101033)

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(1 H NMR)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%热失重温度均在285℃以上。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.

关 键 词：香蕉形液晶 刚性 织构 合成 

分 类 号：TB34[一般工业技术—材料科学与工程] TB383