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Thermodynamics of Leather Dyeing
Author(s) -
Coward M. P.,
Nursten H. E.
Publication year - 1964
Publication title -
journal of the society of dyers and colourists
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 0037-9859
DOI - 10.1111/j.1478-4408.1964.tb02602.x
Subject(s) - dyeing , chemistry , orange (colour) , mole , titration , acid dye , enthalpy , affinities , entropy (arrow of time) , thermodynamics , nuclear chemistry , stereochemistry , organic chemistry , food science , physics
The interaction of a specially purified hide powder, the preparation of which is described, and a series of pure dye acids has been investigated by determining the distribution of the colouring matters at equilibrium, usually at ten points on the titration curve. Reciprocal plots gave a mean saturation value of 1·00 milliequiv/g collagen. The following affinities (kcal/mole) were obtained at 25°C: C.I. Acid Orange 7–10·6 ± 0·3, C.I. Acid Orange 8 ‐11·0 ±0·3, C.I. Acid Red 88 –11·7 ±0·2, C.I. Acid Red 13 –16·5 ±0·6, and C.I. Acid Red 27 –21·2 ± 0·6. At 45°C the affinity of the first dye acid was –10·9 ± 0·4 kcal/mole, leading to a heat of dyeing of – 6 kcal mole and an entropy of 15 cal/deg.