By W Ingamells
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Extra resources for Colour for Textiles: A User's Handbook
Each positively charged hydrogen ion is accompanied by a H3N+ Cl– COOH negative wool number of positive and negative COOH charges in the solution are balanced. 7 The formation of salt linkages between a dye and a wool fibre: NaD represents the sodium salt of a large dye molecule acidic. 6). Other acids, such as ethanoic acid (acetic acid, CH3COOH), only partially dissociate in water and therefore are said to be weak acids. e. –log(10–7) = 7. 3, overleaf. In solutions where the pH is greater than 7, the concentration of hydrogen ions is less than Contents in neutral water.
Moreover, in aromatic rings the excitation of an electron is further aided by the enhanced delocalisation of the π electrons. Examples of such dyes and other dyes based on different chromophores (see below) of general commercial interest are given in Appendix 1. One of the most widespread functional groups in coloured organic compounds is the azo group (—N=N—) mentioned earlier. It will react with other aromatic molecules to form the azo compounds that are widely distributed in several different classes of dye.
6 wool NH3+ + Cl– positive charges are equal. This pH is called the isoelectric point of the protein. Fibre structure and elasticity As well as the chemical differences between wool and cotton, there are also differences in the ways in which the constituent polymer chains are arranged in the fibre. These have a profound effect on their physical properties. Wool garments will easily stretch and recover during use, but their cotton counterparts have very little ‘give’. The difference is largely due to the degree of alignment of the polymer chains along the fibre axis.
Colour for Textiles: A User's Handbook by W Ingamells