Download Chemical Principles of Synthetic Fibre Dyeing by S.M. Burkinshaw PDF

By S.M. Burkinshaw

Synthetic fibres are established for lots of functions, with their color being of significant advertisement significance. This generally referenced booklet presents a entire account of the actual chemistry of the dyeing of man-made fibres and microfibres.

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Support for this view was furnished by the findings of Ingamells et at. [126, 206, 208] that plasticisation of PET fibres is dominated by dispersion forces with polar forces playing a small part in the process. 9 Adsorption isotherm of o-phenylphenol on PET fibre at 98°C [197] chi oro benzenes and concluded that only van der Waals' forces were operative. However, although relatively little work has attended the nature of the forces of interaction that contribute towards carrier-fibre substantivity, it seems reasonable to suggest that the substantivity of carriers towards PET and other hydrophobic fibres accrues from the various forces of interaction that have been proposed to account for the substantivity of disperse dyes towards such fibres (as discussed previously).

It was demonstrated [196] that although the presence of o-phenylphenol and also trichlorobenzene increased the water imbibition of PET, the increase furnished by the presence of trichlorobenzene was only very slightly lower than that secured using the more hydrophilic o-phenylphenol and, consequently, these workers concluded that their results did not support the theory of increased water imbibition as the basis of carrier action. 5. Fibre swelling. Waters [8] was the first of many workers [68, 72, 74, 75, 218, 229] to propose that carriers swell PET fibre, as a result 46 CHEMICAL PRINCIPLES OF SYNTHETIC FIBRE DYEING of which, the rate of dye diffusion and thus dyeing rate are increased.

Such deposition can be reduced by discharging the HT dyebath without prior cooling and Skelly [161] suggests that certain carriers may aid the solubility or dispersion of the trimer from the fibre surface thereby reducing recrystallisation on the fibre or dyeing vessel during cooling of HT dyebaths. The liberation of oligomers during dyeing can be minimised by lowering the dyeing temperature from 130 to 120°C and by using the shortest possible dyeing time; non-ionic levelling agents are considered to minimise redeposition of oligomers produced during HT dyeing.

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