期刊文献+

端基含36个4-硝基偶氮苯介晶基元的二代树状碳硅烷的液晶性研究 被引量:3

Studies on Liquid Crystalline of Carbosilane Dendrimer of the Second Generation Containing Thirty-six 4-Nitroazobenzene Mesogenic Groups in Its Periphery
下载PDF
导出
摘要 Liquid crystalline of a new carbosilane dendrimer of the second generation(D2) containing thirty-six 4-nitroazobenzene groups in its periphery was characterized by means of polarizing optical micrograph, DSC and WAXD. Mesogenic compound M5 exhibits threaded, schlieren and inversion lines texture of the nematic phase on the cooling from isotropic phase to solidified temperature. Dendrimer D2 shows the focal conic fan-shaped texture of the smectic A phase on the heating course from 69 to 187 ℃ and on the cooling course from 183 to 64 ℃. After cooling, the smectic E(S E) phase with a texture of the focal conic fan-shape with stripes and concentric arcs appears from smectic A(S A) phase. Phase behavior of dendrimer D2 in liquid crystalline state was K69S A187I182S A57S E47K. The isotropic-smectic A transition enthalpy, smectic A-smectic E transition enthalpy and isotropic-smectic A transition entropy were 1.8, 4.5 and 4.0 J/(K·mol), respectively, and were in agreement with or close to those of small molecular liquid crystal. Liquid crystalline of a new carbosilane dendrimer of the second generation(D2) containing thirty-six 4-nitroazobenzene groups in its periphery was characterized by means of polarizing optical micrograph, DSC and WAXD. Mesogenic compound M5 exhibits threaded, schlieren and inversion lines texture of the nematic phase on the cooling from isotropic phase to solidified temperature. Dendrimer D2 shows the focal conic fan-shaped texture of the smectic A phase on the heating course from 69 to 187 ℃ and on the cooling course from 183 to 64 ℃. After cooling, the smectic E(S E) phase with a texture of the focal conic fan-shape with stripes and concentric arcs appears from smectic A(S A) phase. Phase behavior of dendrimer D2 in liquid crystalline state was K69S A187I182S A57S E47K. The isotropic-smectic A transition enthalpy, smectic A-smectic E transition enthalpy and isotropic-smectic A transition entropy were 1.8, 4.5 and 4.0 J/(K·mol), respectively, and were in agreement with or close to those of small molecular liquid crystal.
出处 《高等学校化学学报》 SCIE EI CAS CSCD 北大核心 2004年第5期988-990,共3页 Chemical Journal of Chinese Universities
基金 国家自然科学基金(批准号 :2 98740 2 0 5 95 73 0 2 9) 山东省自然科学基金(批准号 :Y95 B0 72 0 ) 中国科学院长春应用化学研究所高分子物理重点实验室基金资助
关键词 4-硝基偶氮苯 碳硅烷 液晶行为 树状化合物 Dendrimer Smectic E and A liquid crystal Nitroazobenzene Carbosilane
  • 相关文献

参考文献5

  • 1Marzotko D., Demus D.. Liq. Cryst. Proc. Int. Conf.[C], Bangalore, Oxford: Pergamon Press, 1973: 189-199
  • 2Gray G. W., Goodby J. W. G.. Smectic Liquid Crystals[M], Goasgow and London: Legonard Hill, 1984: 82-93
  • 3Wunderlich B., Moller M., Grebowicz J. et al.. Adv. Polym. Sci.[J], 1988, 87(1): 1-20
  • 4张其震,刘建强,殷晓颖,张静智,赵晓光,李光,季怡萍.二代树状碳硅烷液晶研究——端基含36个己氧基偶氮苯介晶基元[J].高等学校化学学报,2003,24(9):1704-1707. 被引量:8
  • 5SHENGXin(盛昕).[D].Chemistry Department of Shandong Universty,1998.

二级参考文献9

  • 1Percec V. , Chu P., Ungar G. et al. J. Am. Chem. Soc. [J], 1995, 117(46): 11441--11454.
  • 2Ponomareno S. A. , Rebrov E. A. , Bobrovsky A. Yu et al.. Liquid Crystals[J], 1996, 21(1): 1--12.
  • 3Lorenz K. , Hoeher D. , Stuehn B, et al., Adv. Mater. [J], 1996, 8(5): 414--416.
  • 4殷晓颖.Master Dissertation[D].Chem.Dept.Shandong Univ.1999.
  • 5Wooley K.L..Hawker C.J..Pochan J.M.et al.Macromolecules[J].1993.26(7):1514—1519.
  • 6殷晓颖.[D].Chem. Dept. Shandong Univ.,1999.
  • 7张其震,孙继润,崔利,潘景喜.硅碳烷树枝状液晶的研究[J].高等学校化学学报,1997,18(1):158-159. 被引量:20
  • 8张其震,孙继润,王大庆,盛昕,殷晓颍,赵晓光,李光.有机金属钯硅碳烷树状分子液晶配合物研究[J].高等学校化学学报,1998,19(5):827-829. 被引量:19
  • 9张其震,孙继润,王大庆,王艳,李光.含SC相硅碳烷树枝状分子液晶[J].高等学校化学学报,1998,19(7):1175-1177. 被引量:15

共引文献8

同被引文献86

引证文献3

二级引证文献14

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