期刊
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
卷 405, 期 29, 页码 9411-9418出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s00216-013-7400-5
关键词
Tacticity; Poly(N-isopropylacrylamide); Solution; Fluffy solid; Thin film; Gold surface; Infrared spectroscopy
资金
- Japan Society for the Promotion of Science [23350031]
- Ministry of Education, Science, Sports, Culture, and Technology, Japan [23106710]
- Collaborative Research Program of the Institute for Chemical Research, Kyoto University [2012-38]
- Grants-in-Aid for Scientific Research [23350031] Funding Source: KAKEN
Poly(N-isopropylacrylamide) (PNiPAM) compounds with various diad tacticities were prepared, and the molecular interaction properties in a thin film deposited on a gold surface were analyzed using infrared spectroscopy. The intramolecular and intermolecular interactions were found to depend on the tacticity, and only atactic (diad ratio 46 %) PNiPAM exhibits poor molecular interaction even in the bulk sample. On the other hand, the same series of compounds dissolved in an acetone solution were spread on a gold surface to form a thin film. In the dissolution process, the polymer molecules are relaxed via solvation, and they are bound to the gold surface by a molecular interaction to form a submonolayer thin film. In the thin film, the molecular interaction with the gold surface via the N-H group was monitored in the infrared spectra only for a nearly isotactic (m = 90) PNiPAM by an apparent shift of the N-H stretching vibration band. This shift was confirmed by changing the degree of hydrophilicity of the gold surface: a larger shift is found on a gold surface with stronger hydrophilicity. As a result, the conformation of a nearly isotactic molecule is found to be extended by the interaction with the gold surface, which works to immobilize the molecule.
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