Fourier Transform NIR Study of Liquid Diffusion Processes in Nylon 11 Films: Comparison of Water with Alcohols

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• 作者：P. Wu and H. W. Siesler
• 刊名：Chemistry of Materials
• 出版年：2003
• 出版时间：July 15, 2003
• 年：2003
• 卷：15
• 期：14
• 页码：2752 - 2756
• 全文大小：107K
• 年卷期：v.15,no.14(July 15, 2003)
• ISSN：1520-5002

文摘

The diffusion of different deuterium-labeled (OD) low-molecular-weight alcohols and D₂Oin Nylon 11 has been investigated by monitoring the NH/ND exchange in the polymer byFourier transform near-infrared (FTNIR) spectroscopy. The results demonstrate that thediffusion process of the different penetrants is strongly controlled by their molecular structureand geometry. To characterize this phenomenon quantitatively, the diffusion coefficientsfor the different deuteration agents have been determined for Nylon 11. The rate of thediffusion was found to decrease with increasing size of alcohol. Furthermore, it could beshown that with this technique the less ordered regions of the polymer can be separatedspectroscopically from the crystalline domains, which are not accessible for the isotopicallylabeled diffusants.