A contrastive study of adsorption behaviors on polyurethane fiber with diester/diurethane tethered and non-tethered azo disperse dyes
| Autor: | Ling-Ling Hu, Yan-Chun Liu, Gang Bai, Hong-Fei Qian, Gaofeng Feng |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Process Chemistry and Technology General Chemical Engineering Crystal growth 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences chemistry.chemical_compound Adsorption chemistry Chemical engineering Polymer chemistry Fiber Dyeing 0210 nano-technology Polyurethane |
| Zdroj: | Dyes and Pigments. 145:301-306 |
| ISSN: | 0143-7208 |
| DOI: | 10.1016/j.dyepig.2017.06.013 |
| Popis: | To look for a way to improve the fastness properties of disperse dyes on PU fibers, six diurethane/diester tethered azo disperse dyes were prepared and applied to the dyeing of polyurethane fibers. Their detailed adsorption behaviors including the dyeing rate, build-up properties, surface-adsorbed state of dyes and colorimetric properties were investigated as well as compared with those of non-tethered azo dyes. The results showed that there were great differences in adsorption properties between the two types of dyes. The excellent build-up performance of the non-tethered dyes was caused by the crystal growth on the surface of polyurethane fibers, and the serious aggregation of dyes on the surface of fibers would alter the color shade, decrease the chroma and produce poor colorfastness properties. When the tethered dyes were applied to polyurethane fibers, owing to their larger molecular sizes, a higher temperature (120 °C) was needed to finish the dyeing process within a conventional time of 30–40 min, and the crystal growth on the surface of polyurethane fibers was obviously restricted, so that the color of dyed PU fibers became bright and the colorfastness was notably improved. With additional dye concentration, a medium color depth was obtained. It was further demonstrated that the tethering modification of azo disperse dyes to enhance the colorfastness on polyurethane fibers was feasible. |
| Databáze: | OpenAIRE |
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