Authors: Claybourn, M.¹; Colombel, P.¹; Chalmers, J.²

Source: Applied Spectroscopy, Volume 45, Issue 2, Pages 143-315 (February 1991) , pp. 279-286(8)

Publisher: Society for Applied Spectroscopy

Abstract:

Carbon-filled polymers, due to their opacity, are normally difficult to characterize by IR spectroscopy. We describe a method for obtaining spectra based on a specular reflectance measurement at normal incidence using the IR microscope. Peaks in the specular reflectance spectrum have a derivative-like shape due to refractive index dispersion. After application of the Kramers-Kronig transformation, an absorption index spectrum is obtained; this has a more conventional appearance and is thus much easier to interpret. The technique was found to be applicable so long as certain criteria were met, such as optical flatness and no contributing reflectance effects from the subsurface. Various polymeric materials were examined which contained carbon in the range 2 to 25% w/w. This approach was found unsuitable for carbon-fiber/polymer composites which show predominantly diffuse reflectance due to scattering at the surface features.

Keywords: Infrared spectroscopy; Specular reflectance; Infrared microscope; Carbon-filled polymers; Kramers-Kronig transform

Document Type: Research article

DOI: http://dx.doi.org/10.1366/0003702914337669

Affiliations: 1: ICI Paints, Research Department, Slough SL2 5DS, UK 2: ICI Materials Research Centre, Wilton, Middlesbrough, TS6 8JE, UK

Publication date: 1991-02-01

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