高等学校化学学报

高等学校化学学报 ›› 2003, Vol. 24 ›› Issue (9): 1704.

• 论文 • 上一篇    下一篇

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

张其震1, 刘建强1, 殷晓颖1, 张静智1, 赵晓光2, 李光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:2002-08-06 出版日期:2003-09-24 发布日期:2003-09-24
  • 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);中国科学院高分子化学和物理国家重点实验室基金

Studies on Carbosilane Liquid Crystalline Dendrimer of the Second Generation--Containing 36 4-Hexyloxyazobenzene Groups in Its Periphery

ZHANG Qi-Zhen1, LIU Jian-Qiang1, YIN Xiao-Ying1, ZHANG Jing-Zhi1, ZHAO Xiao-Guang2, LI 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:2002-08-06 Online:2003-09-24 Published:2003-09-24

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摘要： 用发散法合成周边含36个己氧基偶氮苯介晶基元(M3)端基的新的二代树状碳硅烷液晶(D2),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法进行表征.D2为向列相,与M3相同.D2液晶态相行为是K90N105I1l3N75K,D2熔点比M3降低2633℃,D2清亮点比M3降低315℃,D2液晶态温区比M3加宽1130℃.D2和一代树状物D1的相态由介晶基元相态决定.D2熔点比D1降低23℃.D2清亮点比D1降低1121℃,D2液晶态温区比D1减少819℃.

关键词: 树状化合物, 液晶, 向列相, 碳硅烷

Abstract: The divergent synthesis of a new carbosilane liquid crystalline(LC) dendrimer of the second generation(D2) was described. Thirty-six 4-hexyloxyazobenzene groups (M3) were used as mesogenic fragments and attached to its periphery. The structure and properties of D2 were characterized by elementary analysis, 1HNMR, MALDI-TOF-MS, IR, UV, polarizing optical micrograph, DSC and WAXD. It is argued that mesophase of nematic type is realized. It is shown that the mesophase type of the dendrimer D2 and D1 essentially depends on the chemical nature of the mesogenic groups and is the same as that of mesogenic unites. The phase behavior of D2 in LC state is K90N105H113N75K. The melting point of D2 decreases 26-33℃ than that of M3, the temperature at its clear point decreases 3-15℃ than that of M3 and its mesophase region is enlarged 11-30 ℃ than that of M3. The melting point of D2 decreases 2-3℃ than that of D1, the temperature at its clear point decreases 11-21℃ than that of D1 and its mesophase region decreases 8-19℃ than that of D1.

Key words: Dendrimer, Liquid crystal, Nematic phase, Carbosilane

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