Page 53 - Handbook of Properties of Textile and Technical Fibres

34 Handbook of Properties of Textile and Technical Fibres

KF-I
KF-II

Transmittance/%

C=O
4000 3500 3000 2500 2000 1500 1000
Wavenumber/cm –1
Figure 2.7 Comparison of Fourier transform infrared (FTIR) spectrum of pristine (KF-I) and
aireplasma treated (KF-II) Kevlar fabrics from Guo et al. (2009). From FTIR analysis the
authors demonstrated that aireplasma treatment enables the removal of both sizing agent and
oxidation at the fiber surface.

Fig. 2.8. In each case the fibers are mounted on the surface of a crystal, usually KBr,
and the infrared beam glances off the surface of the fiber where it is then collected and
analyzed. The glancing limits the depth of analysis to a few micrometers.
As illustrated in Fig. 2.7, Fourier transform infrared analysis enables subtle
physicalechemical modifications of the outer fiber surface induced by process steps,

Specimen

In from source Out to detector

ATR, attenuated total reflection

Specimen

In from source Out to detector

MIR, multiple internal reflection
Figure 2.8 Internal reflection techniques in infrared spectroscopy: ATR, attenuated total
reflection; MIR, multiple internal reflection.