Infrared Spectroscopic Study of Molecular Interaction of Tacticity-Controlled Poly(N-isopropylacrylamide) in a Cast Film Deposited on a Solid Substrate
Analytical results of a series of poly(N-isopropylxacrylamide) (PNiPA) with different tacticities using infrared spectroscopy are presented for studying the influence of the solvation and molecular interactions between the polymeric chains. Infrared spectra of solid matters of the compounds exhibit a systematic band intensity change for three band components at 1680, 1659 and 1628 cm-1 involved in the amide I band. The three components correspond to the free, half and full hydrogen bondings of the secondary amide group, which reflect the molecular configuration depending on the tacticity. When cast films of the compounds prepared on a solid surface are analyzed by infrared transmission spectrometry, another factor of solvent used for the film preparation is found to play an important role to determine the molecular architecture in the films. This molecular imprint mechanism after the solvation is confirmed by measuring infrared multiple-angle incidence resolution (MAIR) spectra of annealed films. The molecular interactions in the polymeric matter have been revealed by the use of infrared spectroscopy and the tacticity-controlled samples.
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