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4.
Analysis of the 6-m
5.
Analysis of a microsample consisting of a single fiber with a polymer
coating.
6.
Analysis of a three-component sample with layer thicknesses too thin for
cross-sectional analysis by FT-IR microscopy.
Application 1.
Automobile
paint finishes are processed in a baking oven that causes the cure chemistry to
progress to the desired point. The
spectra in Figure 19 show how the cure varies for different oven temperatures
and how paint samples can be tested to verify that the correct cure level is
reached. The spectra were measured
by continuous-scan FT-IR at 2.5 kHz and 8 cm-1 resolution.
Figure 19. Photoacoustic
spectra of a paint processed at five cure oven temperatures, (1) under
bake,
220°C, (2)
250°C, (3) 265°C,
(4) 285°C, and (5) over bake, 325°C.
The wavenumber
scale is not enumerated due to proprietary concerns.
Application 2.
In this study, wood from seven species of trees were analyzed to
distinguish between hardwoods and softwoods, and between different species.
Determinations were also made of hemicellulose, lignin, glucan, and
extractives in the woods. FT-IR PAS
can easily measure spectra of single slab specimens, but in order to get the
necessary