摘要
以基于季戊四醇-四烯丙基醚的硅氢化产物PCSi-1G-Cl为脚手架、4-己氧基-4′-羟己氧基偶氮苯(M-C6)为介晶基元,合成了季戊四醇为核、端基含12个己氧基偶氮苯的新型硅碳烷液晶树状物PCSi-1G-C6。利用元素分析、傅立叶变换红外光谱(FT-IR)、核磁共振(NMR)、偏光显微镜(POM)和差示扫描量热(DSC)进行了表征。PCSi-1G-C6与M-C6同为相列相,树状物相态由介晶基元相态决定。PCSi-1G-C6的熔点比M-C6低50℃,清亮点比M-C6低16℃,液晶态温区比M-C6宽34℃。
A terminal Si-Cl functional carbosilane PCSi-1G-Cl based on pentaerythritol was used as dendritic scaffold and was subsequently functionalized with 4-[4-(6-hydroxyhexyloxy) phenylazo] hexaoxybenzene (M-C6) as mesogenic groups. A novel carbosilane liquid crystalline dendrimer PCSi-1G-C6 containing 12 hexaoxyazobenzene mesogens on the periphery was prepared. Characterized by the elemental analysis, FT-IR, 1H NMR, polarizing optical micrograph and DSC, PCSi-1G-C6, similar to M-C6, is nematic liquid crystal, which shows that the mesogenic state depends on that of mesogenic units. The melting point of PCSi-1G-C6 is 50°C lower than that of M-C6. The clearing point of PCSi-1G-C6 is 16°C lower than that of M-C6. The mesophase region of PCSi-1G-C6 is 34°C wider than that of M-C6.
出处
《现代化工》
EI
CAS
CSCD
北大核心
2004年第5期31-33,共3页
Modern Chemical Industry
基金
国家自然科学基金资助项目(29874020
59573049)
关键词
硅碳烷液晶树状物
季戊四醇
已氧基偶氮苯
介品甚元
carbosilane liquid crystalline dendrimer
pentaerythritol
hexaoxyazobenzene
mesogenic unit
