Thermochromism and Structural Change in Polydiacetylenes Including Carboxy and 4-Carboxyphenyl Groups as the Intermolecular Hydrogen Bond Linkages in the Side Chain
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- 作者：Chiaki Tanioku ; Kimihiro Matsukawa ; Akikazu Matsumoto
- 刊名：ACS Applied Materials & Interfaces
- 出版年：2013
- 出版时间：February 13, 2013
- 年：2013
- 卷：5
- 期：3
- 页码：940-948
- 全文大小：624K
- 年卷期：v.5,no.3(February 13, 2013)
- ISSN：1944-8252
文摘
We investigated the thermochromic behavior of polydiacetylenes including the carboxy and 4-carboxyphenyl groups as the side-chain substituents adjacent to the conjugated main chain, and then, the thermal stability and the thermochromism reversibility of the polymers were related to changes in the polymer conformations monitored by IR and Raman spectroscopies and powder X-ray diffractions. The polydiacetylenes with no or a phenylene spacer between the main chain and the carboxylic acid moiety were revealed to exhibit a thermal resistance for maintaining reversible thermochromism in a high temperature range, rather than polydiacetylenes with a conventional structure with a flexible alkylene spacer. The molecular stacking structures of the diacetylenes and the corresponding polymers in the crystals were discussed based on the results of an X-ray single-crystal structure analysis as well as the powder X-ray diffraction measurements.