Novel luminescent liquid crystalline polyazomethines. Synthesis and study of thermotropic and photoluminescent properties
Novel luminescent liquid crystalline polyazomethines. Synthesis and study of thermotropic and photoluminescent properties
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DOI：
10.1080/02678292.2013.852258
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发表时间：
2014-01
期刊：
影响因子：
2.2
通讯作者：
A. Zabulica;E. Perju;M. Brumǎ;L. Marin
中科院分区：
文献类型：
--
作者：
A. Zabulica;E. Perju;M. Brumǎ;L. Marin
采用柔性双醛与含芴、蒽醌、嘧啶、偶氮苯和二苯甲酮的中间体二胺缩合反应，合成了含显色基团的新型半柔性聚亚氮亚胺。通过差示扫描量热法、偏振光显微镜和混相关系的研究评估了所得聚亚胺的热致性。纯聚偶氮亚胺表现出难以归属的双折射粘性织构，但与液晶二聚体混合后，观察到清晰的纹影或大理石纹织构，表明其为向列中间相。聚合物表现出紫色、蓝色或黄色的光发射。
Novel semiflexible polyazomethines containing chromophoric units into azomethine mesogenic core have been synthesised by condensation of a flexible dialdehyde with mesogenic diamines containing fluorene, antraquinone, pyrimidine, azobenzene and benzophenone. The thermotropic behaviour of the resulting polyazomethines was assessed by differential scanning calorimetry, polarised light microscopy and investigations of the miscibility relations. While the pure polyazomethines showed a birefringent viscous texture difficult to be ascribed, by mixing with a liquid crystal dimer, clear Schlieren or marbled textures were observed, indicating a nematic mesophase. The polymers exhibited violet, blue or yellow light emission.