高等学校化学学报

高等学校化学学报 ›› 2003, Vol. 24 ›› Issue (10): 1887.

• 论文 • 上一篇    下一篇

端基含12个己氧基偶氮苯介晶基元的树状碳硅烷液晶的合成

张其震1, 刘建强1, 殷晓颖1, 张静智1, 李光2, 赵晓光2, 季怡萍2   

  1. 1. 山东大学化学化工学院, 济南 250100;
    2. 中国科学院长春应用化学研究所, 长春 130022
  • 收稿日期:2002-07-09 出版日期:2003-10-24 发布日期:2003-10-24
  • 通讯作者: 张其震(1937年出生),男,教授,主要从事液晶高分子研究.E-mail:qzzhang@sdu.edu.cn E-mail:qzzhang@sdu.edu.cn
  • 基金资助:

    国家自然科学基金(批准号:29874020,59573029)资助

Carbosilane Liquid Crystalline Dendrimer Containing Twelve 4-Hexyloxyazobenzene Mesogenic Groups

ZHANG Qi-Zhen1, LIU Jian-Qiang1, YIN Xiao-Ying1, ZHANG Jing-Zhi1, LI Guang2, ZHAO Xiao-Guang2, JI Yi-Ping2   

  1. 1. School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China;
    2. Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
  • Received:2002-07-09 Online:2003-10-24 Published:2003-10-24

PDF (PC)

被引次数

14

摘要： 用发散法合成了周边含12个己氧基偶氮苯介晶基元(M3)端基的树状碳硅烷(D1),并用元素分析、氢谱、激光质谱、红外光谱、紫外-可见光谱、偏光显微镜、DSC和WAXD对产物进行表征.结果表明,D1为向列相,与M3相同,树状物相态由介晶基元相态决定,D1的液晶态相行为:K92N126I124N78K,D1熔点比M3降低了24～30℃,D1清亮点比M3提高了6～8℃,D1液晶态温区比M3加宽30～38℃,在树状物中观察到S=+2的高强向错.

关键词: 树状化合物, 液晶, 向列相, 高强向错, 碳硅烷

Abstract: The divergent synthesis of a new carbosilane liquid-crystalline(LC) dendrimer(D1) was described.Twelve4-hexyloxyazobenzene groups (M3) were used as mesogenic fragments and attached to its periphery.Structure and properties of D1 were characterized by means of elemental analysis, 1H NMR, IR, UV, MALDI-TOF-MS, polarizing optical micrograph, DSC and WAXD.D1 is a nematic liquid crystal, which is the same as M3.The mesomorphic behaviour of the dendrimer depends on that of the mesogenic units.Phase behavior of D1 is K92N126I124N78K.m.p.of D1 is 24-30 ℃ lower than that of M3, its clearing temperature is 6-8 ℃ higher than that of M3 and its mesophase region is 30～38 ℃ wider than that of M3.The clearing enthalpy of D1 accords with the value that is commonly found for n-i phase transition in LCand LCpolymers.This may be due to the deformation of branched dendrimer D1 which can be change to fit into the anisotropic LC phase structure.Eight extinguished brushes emanating from a stationary point are observed, corresponding to the high-strength disclination of S=+2 of dendrimer.

Key words: Dendrimer, Liquid crystal, Nematic phase, High-strength disclination, Carbosilane

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