Variable-Temperature Fourier Transform Near-Infrared (FT-NIR) Imaging Spectroscopy of the Diffusion Process of Butanol(OD) into Polyamide 11

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Abstract:

Time-resolved Fourier transform near-infrared (FT-NIR) spectroscopic imaging was applied to the diffusion process of butanol(OD) into polyamide 11 (PA11) with a novel sheet-structured variable-temperature-controlled sample holder in order to demonstrate the significant differences of diffusion rate below and above the glass transition temperature of PA11. The diffusant butanol(OD) was chosen for two reasons: (1) it allows the diffusion front to be monitored by the intensity decrease of a NH-specific absorption band of PA11 due to the NH/ND isotope exchange and (2) under the measurement conditions the diffusion of butanol(OD) into PA11 takes place in an experimentally manageable time frame. Apart from the in situ visualization of the diffusion front in the time-resolved FT-NIR images, the type of diffusion and the diffusion coefficient of butanol(OD) into PA11 have been determined.

Keywords: BUTANOL(OD); DIFFUSION; FOURIER TRANSFORM NEAR-INFRARED SPECTROSCOPY; POLYAMIDE 11; VARIABLE-TEMPERATURE FT-NIR IMAGING

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/11-06309

Affiliations: 1: School of Science & Technology, Kwansei Gakuin University, Sanda 669-1337, Japan. MiriamUnger@gmx.de 2: School of Science & Technology, Kwansei Gakuin University, Sanda 669-1337, Japan 3: Department of Physical Chemistry, University of Duisburg-Essen, Schuetzenbahn 70, D 45117 Essen, Germany

Publication date: September 1, 2011

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