Synthesis,Design and Liquid Crystal Behavior Characterization of a New Bowlic Liquid Crystal of CTV Derivative

[中文文摘]碗状的CTV(cyclotriveratrylene)系衍生物主要由三聚法合成,即以香兰素为原料,先制备所需结构的单体衍生物,再进行三聚关环的方法,但该方法无法合成具有较大外围基团的CTV衍生物.新设计了先关环后衍生化的合成路线,成功地合成了一种含较长脂肪链外围基团的新CTV衍生物-CTV-Ⅲ.产物的化学结构经1H-NMR1、3C-NMR、质谱以及元素分析表征验证.通过差示扫描量热法、热台偏光显微镜和小角激光光散射的研究表明,CTV-Ⅲ具有热致液晶性,在其液晶温区内呈现向列相,称为碗状液晶向列相(BN相).CTV-Ⅲ的升温相变序为:G 70℃Cr 87℃BN100℃I.[英文文摘]Normally the bowlic cyclot riverat rylene (CTV) derivatives were synthesized via a multistep sequence from vanillin. This typical method is termed trimerization. But it is difficult to prepare the CTV derivatives with large peripheral groups via this method.An alternative synthesis route ,i. e. derivation af ter ring closure reaction ,was designed to obtain the new CTV derivative2CTV2 Ⅲ. The chemical structure of the product was characterized by means of 1 H-NMR ,13 C-NMR ,mass spectrometry and element analysis. The behaviour of thermotropic liquid crystal of CTV-Ⅲ was observed by differential scanning calorimetry, hot stage coupled polarized optical microscopy and small angle laser light scattering. The mesophase of CTV-Ⅲ was nematic,named bowlic nematic phase (BN ). Its phase transition series of heating were determined to be G 70 ℃Cr 87 ℃BN 100 ℃ I.国家自然科学基金(20774077); 福建省自然科学基金(E0510003); 厦门市科技计划项目(3502Z20055013)

The Self-assemble Behavior of Benzoyl Chitosan and Amino Acids in Selective Solvents

[中文文摘]研究了苯甲酰化壳聚糖(DBC)和天然生物分子氨基酸在选择性溶剂N,N-二甲苯甲酰胺(DMF)和水中的自组装行为.在超声波作用下,透明的混合溶液出现蓝白色乳光,同时紫外-可见光谱呈现透光率的突变,体系完成了自组装.自组装是通过两组分之间的氢键作用产生的.用动态光散射(DLS)和透射电镜(TEM)分别研究了自组装粒子的尺寸和形态.实验结果表明,苯甲酰化壳聚糖和氨基酸可以形成纳米尺寸或亚微米尺寸的自组装微粒,形成的微粒为球形或椭球形,微粒的尺寸为60~720 nm.粒子的尺寸显著受pH值和氨基酸种类的影响,因而可以利用pH值和氨基酸的种类控制自组装粒子的尺寸.[英文文摘]Self-assemble of two kinds of natural biodegradable substances,i.e.benzoylchitosan and amino acids in selective solvents DMF and water was studied.Under ultrasonic treatment,mixed solution which is transparent gradually presented blue-white opalescence.At the same time,uv-vis spectra presented mutation of transmittance.The self-assemble of this system was finished.The behavior of self-assemble is induced by hydrogen bonding.The morphology and the size of the particles were characterized by dynamic light scattering (DLS) and t ransmission elect ron microscope ( TEM) . The results showed that benzoylchitosan and amino acids can self-assemble to form nanoparticles or submicron particles. The shape of the particles was spheroid or sphere ,the size of the particles was 60～720 nm. The size of the self2assembly particles can be influenced both by the p H of solution and the species of amino acids.Therefore ,we can adjust p H and the species of amino acids to control the size of self-assemble particles.国家自然科学基金(20774077); 福建省自然科学基金(E0510003); 厦门市科技计划项目(3502Z20055013)