The SEM technique was used to investigate the change in the
surface morphology of the dyed cationized cotton fabric with both
the CH and US dyeing methods. The results obtained are shown in
Fig. 10. It is obvious that the fibres dyed with the CH method (a) are
smooth and distinct. In contrast, the fibres dyed with US method
(b) are no longer smooth and become rough. These results may
be due to the creation of voids in the fibre structure, lead to a physical
loosening of the microstructure of the dyed fibre with an
increasing more possibility for the penetration of the dye molecules
into the fibres. On the other hand, the US dyeing method is
associated with cavitation effects, which would lead to [11,21]:
dispersion, degassing and diffusion (accelerating the rate of dye
diffusion inside the fibre by piercing the insulating layer covering
the fibre and accelerating the chemical reaction between dye and
fibre).
The SEM technique was used to investigate the change in the
surface morphology of the dyed cationized cotton fabric with both
the CH and US dyeing methods. The results obtained are shown in
Fig. 10. It is obvious that the fibres dyed with the CH method (a) are
smooth and distinct. In contrast, the fibres dyed with US method
(b) are no longer smooth and become rough. These results may
be due to the creation of voids in the fibre structure, lead to a physical
loosening of the microstructure of the dyed fibre with an
increasing more possibility for the penetration of the dye molecules
into the fibres. On the other hand, the US dyeing method is
associated with cavitation effects, which would lead to [11,21]:
dispersion, degassing and diffusion (accelerating the rate of dye
diffusion inside the fibre by piercing the insulating layer covering
the fibre and accelerating the chemical reaction between dye and
fibre).
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