【摘要】 以基于季戊四醇的二代硅碳烷树状氯化物PCSi-2G-Cl为脚手架、4-硝基-4’-羟己氧基偶氮苯(M-NO2)为介晶基元,合成了以季戊四醇为核、端基含36个硝基偶氮苯的新型硅碳烷液晶树状物PCSi-2G-NO2。利用红外光谱(IR)、核磁共振(1H NMR)、元素分析(EA)、偏光显微镜(POM)和差示扫描量热法(DSC)进行了表征,PCSi-2G-NO2显示近晶相,其液晶相行为是K57SE76SA111I110SA75SE56K。而对应的介晶基元M-NO2则为向列相,树状物与修饰单元在熔点、清亮点和液晶态温度区间等方面也存在较大差异。更多还原

【Abstract】 The second generation terminal Si-Cl functional carbosilane dendrimer PCSi-2G-Cl based on pentaerythritol was used as dendritic scaffold and was subsequently functionalized with 4-nitroazobenzene（M-NO₂） mesogenic groups,A novel carbosilane liquid crystalline dendrimer PCSi-2G-NO₂ containing 36 4-nitroazobenzene mesogens on the periphery was prepared.Characterized by elemental analysis,FTIR,1H NMR,polarizing optical micrograph,and DSC.PCSi-2G-NO₂ is smectic liquid crystal,different from the corresponding mesogenic group M-NO₂,which shows nematic phase units.Between the dendrimer and the modifying unit,there are some differences in terms of not only the phase behavior,but also the melting temperature,the clearing temperature,and the temperature region of mesogenic phase.更多还原