【摘要】 合成了周边含 4个丁氧基偶氮苯介晶基元 (M 5 )端基新的零代光致变色液晶树状物 (D0 ) ,并用元素分析、核磁共振、基质辅助激光解吸飞行时间质谱、红外、紫外、偏光显微镜、差示扫描量热 (DSC)和广角X射线衍射法 (WAXD)表征 .D0显示向列相 ,与M 5相同 ,树状物相态由介晶基元相态所决定 ,D0的相行为 :K13 8N14 7I14 5N118K .对零代 (D0 )、一代 (D1)、二代 (D2 )和三代 (D3 )液晶树状物的清亮焓、清亮熵、熔化焓和熔化熵进行了比较更多还原

【Abstract】 The synthesis of a new photochromic liquid crystalline (LC) dendrimer of the zero generation (D0) is described. Four 4-butoxyazobenzene groups were used as mesogenic fragments and attached in its periphery. Structure and properties of D0 were characterized by elemental analysis, 1H NMR, MALDI-TOF-MS, IR, UV, polarizing optical micrograph, DSC and WAXD. Similar to M5, D0 is nematic liquid crystal. The mesomorphic state of dendrimer D0 depends on that of mesogenic units. Phase behavior of D0 in LC state is K138N147I145N118K. The isotropic enthalpy, isotropic entropy, melting enthalpy and melting entropy of the dendrimers of the zero, first, second and third generations were compared.更多还原