Multivariate Curve Resolution Analysis on the Multi-Component Water Sorption Process into a Poly(2-methoxyethyl acrylate) Film

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Abstract:

In our previous study, sorption process of water into a biocompatible polymer film, poly(2-methoxyethyl acrylate) (PMEA) was monitored by time-resolved in situ attenuated total reflection infrared (ATR-IR) spectroscopy [S. Morita, et al., Langmuir 23, 3750 (2007)]. In the present study, noisy and heavily overlapped O–H stretching vibrational bands of diffusing water have been analyzed from the series spectra where the spectral shapes change irregularly with time. In spite of these complications, a powerful spectral analysis technique, multivariate curve resolution (MCR) by means of alternating least squares (ALS), yielded smooth and meaningful pure component spectra and detailed kinetic sorption profiles of each component, excluding noise. Ordinary smoothing techniques and Gaussian curve fitting would not achieve these significant results. The quantification of the kinetic parameters such as amplitudes (a) and relaxation time constants (τ) is significant for the systematic development of biocompatible materials and also for revealing the mechanisms of biocompatibility of a material. Moreover, the ratios of coefficients of each component at saturation corresponded well to the values obtained by Tanaka et al. measured by gravimetric analysis. This study is the first to report the detailed concentration profile of each water component whose sorption kinetics is discussed comprehensively.

Keywords: ATR-IR; ATTENUATED TOTAL REFLECTION INFRARED SPECTROSCOPY; BIOCOMPATIBLE POLYMER FILM; IN SITU TIME-RESOLVED SERIES SPECTRA; MCR; MULTIVARIATE CURVE RESOLUTION; PMEA; POLY(2-METHOXYETHYL ACRYLATE); WATER SORPTION PROCESS

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370208783412555

Affiliations: 1: Department of Chemistry, School of Science and Technology, Kwansei Gakuin University, Sanda 669-1337, Japan 2: Division of Energy Science, EcoTopia Science Institute, Nagoya University, Nagoya 464-8603, Japan 3: Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan

Publication date: January 1, 2008

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