Abstract

The attenuated total reflectance Fourier transform infrared (ATR/FTIR) method in the near-infrared region was found to provide a novel opportunity for nondestructive analysis of ethylene-propylene (EP) blend polymer. The absorption due to the overtone of the C-H stretching vibration at ∼5900 cm⁻¹ was utilized to determine the ratio of two monomer units, the ethylene and propylene units, of the blend polymer, since the overlapping of CH₃− and −CH₂− is not so prohibitive as in the case of the fundamental C-H stretching vibration at ∼2900 cm⁻¹. The well-known disadvantage of the weak intensity of the overtone absorption, however, was overcome by the choice of the high-sensitivity FT-IR technique.

Recent applications of FT-IR spectroscopy to polymer systems

J. L. Koenig and M. K. Antoon
Appl. Opt. 17(9) 1374-1385 (1978)

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R. C. Lord and Putcha Venkateswarlu
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Absorption and scattering in low-loss polymer optical waveguides

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J. Opt. Soc. Am. B 18(7) 908-912 (2001)

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Jeanette G. Grasselli and Lynn E. Wolfram
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Homogeneous polymer blend microparticles with a tunable refractive index

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