Multiple Peak Reference Method for Polarized Fourier Transform Infrared–Attenuated Total Reflection Spectroscopy to Determine the Three-Dimensional Orientation of a Uniaxially Drawn Poly(trimethylene 2,6-naphthalate) Film

Authors: Liang, Yongri1; Choi, Ki Woon2; Lee, Han Sup2

Source: Applied Spectroscopy, Volume 62, Issue 12, Pages 324A-362A and 1285-1399 (December 2008) , pp. 1314-1321(8)

Publisher: Society for Applied Spectroscopy

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Abstract:

The polarized Fourier transform infrared–attenuated total reflection (FT-IR-ATR) technique is a very useful infrared spectroscopic method for characterizing the three-dimensional orientation of thick samples, to which the conventional transmission FT-IR method cannot easily be applied. To quantitatively analyze polarized FT-IR-ATR spectra, the dependence of the optical contact between the sample and the ATR crystal during the clamping and reclamping processes must be controlled. In this work, a new multiple peak reference (MPR) method is proposed and used to carry out a three-dimensional analysis of a poly(trimethylene 2,6-naphthalate) (PTN) polymer sample. The conventional single peak reference (SPR) analysis technique cannot be applied to such a sample due to the lack of an established reference peak. A new artificial reference band was generated by the MPR method using two different infrared bands, at 1602 cm−1 and 917 cm−1, in identical spectra with a combination constant of 0.95. The new artificial reference band was successfully used to calculate the three-dimensional orientation of various infrared bands of a uniaxially drawn PTN film, which has not previously been studied by three-dimensional orientation analyses using the polarized FT-IR-ATR method.

Keywords: ATTENUATED TOTAL REFLECTION; FOURIER TRANSFORM INFRARED SPECTROSCOPY; FT-IR-ATR; MULTIPLE PEAK METHOD; POLYMER ANALYSIS; THREE-DIMENSIONAL ORIENTATION

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370208786822241

Affiliations: 1: Department of Textile Engineering, INHA University, Incheon 402-751, Korea; Department of Chemistry, University of Montreal, PO Box 6128, Station Downtown, Montreal, QC, H3C 3J7, Canada 2: Department of Textile Engineering, INHA University, Incheon 402-751, Korea

Publication date: December 1, 2008

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