Rodlike mesogenic molecules consisting of two diacetylenic groups: mesomorphic behavior and photoimaging
Rodlike mesogenic molecules consisting of two diacetylenic groups: mesomorphic behavior and photoimaging
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DOI：
10.1039/b300743j
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发表时间：
2003-04
影响因子：
--
通讯作者：
H. Cho;Kyungja Seo;Cheol Ju Lee;H. Yun;J. Chang
中科院分区：
文献类型：
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作者：
H. Cho;Kyungja Seo;Cheol Ju Lee;H. Yun;J. Chang
合成了一系列含两个二炔基的介晶化合物。二乙炔基团通过酯键连接到苯环上，成为刚性棒的一部分。研究了化合物的热行为及其聚合反应。具有长烷基尾的化合物7、8、9和10显示出双相中间相。它们在高于200 °C的各向同性状态下热聚合。在液晶状态下通过退火发生部分聚合。当化合物在液晶状态下暴露于UV光时，聚合在30分钟内完成，得到无定形聚二乙炔。在UV-Vis光谱中，聚合物的吸收发生在高达约600 nm处，这归因于短的共轭聚丁二炔主链。将具有辛基尾的化合物9制成薄膜，并通过液晶态的光掩模进行光聚合，得到图案化图像。
A series of mesogenic compounds with two diacetylenic groups were synthesized. The diacetylene groups were connected to a benzene ring via ester linkages, becoming a part of a rigid rod. The thermal behavior of the compounds and their polymerization were investigated. Compounds 7, 8, 9 and 10 having long alkyl tails showed nematic mesophases. They were thermally polymerized in the isotropic state above 200 °C. Partial polymerization occurred by annealing in the liquid crystalline state. When the compounds were exposed to UV light in the liquid crystalline state, the polymerization was completed within 30 min to give amorphous polydiacetylenes. In the UV-Vis spectra, absorption of the polymers occurred up to about 600 nm, attributable to the short conjugated polydiacetylene backbones. Compound 9 with an octyl tail was fabricated into a thin film and the photopolymerization was carried out through a photomask in the liquid crystalline state resulting in a patterned image.