Two-Dimensional/ATR Infrared Correlation Spectroscopic Study on Water Diffusion in a Poly(-caprolactone) Matrix
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- 作者：Yun Peng ; Peiyi Wu ; and H. W. Siesler
- 刊名：Biomacromolecules
- 出版年：2003
- 出版时间：July 2003
- 年：2003
- 卷：4
- 期：4
- 页码：1041 - 1044
- 全文大小：84K
- 年卷期：v.4,no.4(July 2003)
- ISSN：1526-4602
文摘
In the present contribution, two-dimensional ATR-FTIR spectroscopy was used to study the diffusion ofwater in poly(
hars/epsilon.gif" BORDER=0 >-caprolactone) (PCL). In the spectral region of the hars/nu.gif" BORDER=0 >(OH) stretching vibration of water, fourabsorption bands (3635, 3560, 3411, and 3220 cm-1) can be identified. The higher wavenumber band pairat 3635 and 3560 cm-1 is assigned to the antisymmetric and symmetric OH stretching vibrations, respectively,of water which is partially hydrogen-bonded to the carbonyl groups of PCL, whereas the lower frequencyband pair at 3411 (antisymmetric) and 3220 cm-1 (symmetric) is attributed to the OH stretching vibrationsof bulk water which is fully hydrogen-bonded to other water molecules. From the asynchronous map of a2D correlation analysis of spectra recorded during the diffusion of water into PCL, it was concluded thatduring the diffusion process the water molecules first penetrate into the free volume (microvoids) of thePCL matrix or are molecularly dispersed in the polymer matrix and then form hydrogen bonds with theC=O groups of the polymer.
hars/epsilon.gif" BORDER=0 >-caprolactone) (PCL). In the spectral region of the hars/nu.gif" BORDER=0 >(OH) stretching vibration of water, fourabsorption bands (3635, 3560, 3411, and 3220 cm-1) can be identified. The higher wavenumber band pairat 3635 and 3560 cm-1 is assigned to the antisymmetric and symmetric OH stretching vibrations, respectively,of water which is partially hydrogen-bonded to the carbonyl groups of PCL, whereas the lower frequencyband pair at 3411 (antisymmetric) and 3220 cm-1 (symmetric) is attributed to the OH stretching vibrationsof bulk water which is fully hydrogen-bonded to other water molecules. From the asynchronous map of a2D correlation analysis of spectra recorded during the diffusion of water into PCL, it was concluded thatduring the diffusion process the water molecules first penetrate into the free volume (microvoids) of thePCL matrix or are molecularly dispersed in the polymer matrix and then form hydrogen bonds with theC=O groups of the polymer.