期刊文献+

含乙烯基末端的液晶二聚体的合成与液晶行为研究

Synthesis and Mesomorphism of Liquid Crystalline Dimers with Vinyl-Terminals
下载PDF
导出
摘要 合成了一种新型的末端含不饱和双键的席夫碱类液晶化合物,分子结构中含有刚性酯类液晶基元及亚胺间隔基结构,并通过扫描量热(DSC)和偏光显微镜(POM)对其介晶相转变行为进行了表征。结果表明该二聚体与单体表现出不同的液晶行为,二聚体不仅具有向列相(N)液晶结构(120~139℃),且在低温区间显示出层状的近晶C型(SmC)液晶结构(91~120℃),液晶稳定性明显高于单体(单体液晶相温度范围为45~64℃)。实验结果为合成稳定的液晶化合物提供了实验依据。 A novel Schiff-base type liquid crystal compound with reactive vinyl terminals and flexible spacer was synthesized. The structure of this dimeric compound was characterized by FT-IR, 1H-NMR, 13C-NMR, ESI-MS. The liquid crystalline behavior of the compound characterized by differential scanning calorimetry (DSC) and polarizing optical microscopy (POM) is different from that of monomer. For the liquid crystal dimer, typical nematic phase texture can be observed between 120℃ and 139℃. Moreover, smectic C phase was also found between 91℃ and 120℃. The dimeric compound exhibits wider mesophase temperature ranges than that of monomer, which indicates higher mesomorphic stability. This result is available for the synthesis of liquid crystal compounds with high mesophase stability.
出处 《高校化学工程学报》 EI CAS CSCD 北大核心 2014年第1期59-64,共6页 Journal of Chemical Engineering of Chinese Universities
关键词 液晶二聚体 席夫碱 乙烯基末端 近晶型 向列型 liquid crystal dimer Schiff base vinyl-terminal nematic phase smectic phase
  • 相关文献

参考文献21

  • 1Donaldson T, Staesche H, Lu Z B, et al. Symmetric and non-symmetric chiral liquid crystal dimers [J]. Liquid Crystals, 2010, 37(8):1097-1110.
  • 2Fletcher I D, Luckhurst G R. The synthesis and characterization of novel nonsysmmetrical dimers with rod-like mesogenic units [J].Liquid Crystals, 1995, 18(2): 175-183.
  • 3Jakli A, Lischka C, Weissflog W, et al. Helical filamentary growth in liquid crystals consisting of banana-shaped molecules [J].Liquid Crystals, 2000, 27(11): 1405-1409.
  • 4Imrie C T, Henderson P A. Liquid crystal dimers and oligomers [J]. Current Opinion in Colloid & Interface Science, 2002, 7(5-6):298-311.
  • 5Imrie C T, Henderson P A. Liquid crystal dimers and higher oligomers: between monomers and polymers [J]. Chemical SocietyReviews, 2007, 36(12): 2096-124.
  • 6Do E D, Kim K N, Kwon Y W, et al. Dimesogenic liquid crystal consisting of cholesterol and Schiff base moieties: dependence ofLC properties on the spacer length and fluorination of the alkoxy tails [J]. Liquid Crystals, 2006, 33(5): 511-519.
  • 7Rault J, Liebert L, Strzelecki L. Synthesis of dimeric mesogenes [J]. Bulletin De La Societe Chimique De France Partie Ii-ChimieMoleculaire Organique Et Biologique, 1975(5-6): 1175-1178.
  • 8Kant I, Vorl-nder K. Kants Weltanschauung aus seinen Werken [M]. Charleston, South Carolina: BiblioBazaar, 2010.
  • 9Griffin A C, Britt T R. Effect of molecular-structure on mesomorphism .12. Flexible-Center siamese-twin liquid-crystalline diesters -a prepolymer model [J]. Journal of the American Chemical Society, 1981, 103(16): 4957-4959.
  • 10白炳莲,于智莘,王海涛,李敏.液晶二聚体[J].有机化学,2008,28(11):1857-1863. 被引量:3

二级参考文献86

共引文献4

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部