Color Change of Disperse Dyes on Nylon 6 Films with Dye Concentration

Abstract

Spectral changes of disperse dyes on nylon 6 film are investigated with decreasing dye concentration ( C_f ). The visible absorption maxima (λ_max) of most azo disperse dyes shift to longer wavelengths with decreasing C_f. The shift is significant for dyes with dipole structures caused by the intramolecular charge transfer. The spectral change is analyzed in detail for CI Disperse Orange 3 and 5, practical disperse dyes, in terms of McRae's equation and a factor analysis. The λ_max values for these dyes on film in the range of low Cf are much longer wavelengths than those estimated by McRae's equation and shift to shorter wavelengths with increasing temperature. The results of the factor analysis indicate that the visible absorption spectra of dyed films with decreasing Cf can be described as the sum of two distinct spectra, designated as species I and II. Species I has λ_max at longer wavelengths than species II. The ratio of [species I]/[species II] increases with decreasing C_f, causing a red shift of λ_max with decreasing C_f. This result is consistent with the sorption behavior of these dyes by nylon 6 film from water, where the dyes are sorbed by the polymer as two distinct species: L—species—dye taken up by the polymer through the Langmuir sorption mechanism, and P—species—dye taken up by Nemst-type partitioning. For both dyes, the relations between C_f and the concentrations of species I and II are very similar to the relations between Cf and the concentrations of the L- and P-species. We estimate that species I and II in this study correspond to L- and P-species in sorption studies, respectively.

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References

Aspland, J.R. , The Application of Nonionic Dyes to Fibers: Nonionics and Their Sorption by Man-Made Fibers, Textile Chem. Color. 24(10), 36-40 (1992).

Bamford, C.H. , Boulton, J. , Hanby , W.E. , and Ward, J.S. , The Dyeing of Synthetic Polypeptides, Farady Soc. Disc. 16, 222-229 (1954).

Brandrup, J. , and Immergut, E. H. , Eds., "Polymer Handbook," 3rd ed., John Wiley & Sons, NY, 1989, pp. V-109, V-115.

Coates, E. , Aggregation of Dyes in Aqueous Solutions, J. Soc. Dyers Colour . 85, 355-368 (1969).

Irick, G. Jr., and Pacifici, J.G. , Solvent and Substituent on the Ultraviolet-Visible Absorption Spectra of Azo Dyes, Textile Res. J. 42, 391-397 (1972).

Malinowski, E.R. , Obtaining the Key Set of Typical Vectors by Factor Analysis and Subsequent Isolation of Component Spectra, Anal. Chim. Acta 134, 129-137 (1982).

McDowell, W. , and Weingarten, R. , New Experimental Evidence about the Dyeing of Polyester Materials with Disperse Dyes, J. Soc. Dyers Colour. 85, 589-597 (1969).

McRae, E.G. , Theory of Solvent Effects on Molecular Electronic Spectra, Frequency Shifts , J. Phys. Chem. 61, 562-572 ( 1957).

Nakamura, T. , Ohwaki, S. , and Shibusawa, T. , Dyeing Properties of Polyester Microfibers, Textile Res. J. 65, 113-118 (1995).

10.

Ozeki, T. , Morikawa, H. , and Kihara, H. , Estimation of the Preferential Tautomer Structure of the Phenolphthalein in Solution by a Chemometrical Analysis of Its UV/Visible Absorption Spectra , Bunseki Kagaku 42, 887-894 (1993).

11.

Peters. R.H. , Textile Chemistry, vol. 3, in "Physical Chemistry of Dyeing," Elsevior Scientific Publishing Co., Amsterdam, 1975, p. 70.

12.

Ralston, A. , "A First Course in Numerical Analysis," International Student Edition, Kogakusha Company, Tokyo, 1965, pp. 487-492.

13.

Reichardt, C. , "Solvents and Solvent Effects in Organic Chemistry ," 2nd ed., VCH, NY, 1990, p. 296.

14.

Riddic, J.A. , and Bunger, W.B. , "Organic Solvents, Physical Properties and Method of Purification," 3rd ed., Wiley-Interscience, NY, 1970.

15.

Shibusawa, T. , and Chigira, Y. Dual-Mode Sorption of Nonionic Azo Dyes by Nylon 6, J. Polym. Sci. Part B Poly. Phys. 30, 563-568 (1992).

16.

Shibusawa, T. , Diffusion of Nonionic Azo Dyes in Nylon 6 , J. Polym. Sci. Part B Poly. Phys. 31, 29-31 (1993).

17.

Shibusawa, T. , and Nakamura, T. , Multimodal Sorption of Nonionic Dyes with Two Amino Groups by Various Polymers from Water, J. Polym. Sci. Part B Poly. Phys. 33, 159-165 ( 1995).

18.

Shibusawa, T. , Sorption of Azo Disperse Dyes by Nylon 6 from Water, Textile Res. J. 66, 37-44 (1996).

19.

Štrop, P. , Mikeš, F. , and Kálal. J. , On the Microenvironment of Polymers in Solution, I: Properties of Pyridinium Type Polarity Reporters in Synthetic Polymers , J. Phys. Chem. 80, 694-701 (1976).

20.

Suda, Y. , Absorption Spectra of 1,4-Diaminoanthraquinone in Mixed Solvents of Carbon Tetrachloride and Ethyl Alcohol, Bull. Chem. Soc. Jpn. 32, 1384-1385 (1959).

21.

Wegmann, J. , Some Fundamental Aspects in the Dyeing of Synthetic Fibres with Disperse Dyes, Can. Textile Res. J. 79, 37-51 (1962).