|The Physical Object|
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A quantitative relation between the shade depth of PLA and PET based on their dye sorption was developed. Disperse dyes examined had lower washing and crocking fastness on PLA than on PET. Voltammetric reduction on a hanging mercury electrode in aprotic and anhydrous medium was performed for a series of azobenzene dyes. The effects of substituent s on both the aromatic rings . These dyes were originally synthesised for the dyeing of cellulose acetate fibres and subsequently found to be suitable for the dyeing of a large number of synthetic fibres, particularly polyester Author: Mohan Gulrajani. Coal tar, which is a distillate obtained in the coking of coal (Section ), is a source of an amazing number of aromatic compounds. Some of these are listed in Table , which includes nitrogen, oxygen, and sulfur compounds, as well as hydrocarbons.
Wool fibres consist of a complex mixture of approximately different proteins (Zahn and Kusch, ), which are composed of 20 amino acids (Rippon, a).Table shows 18 amino acids because asparagine and glutamine are hydrolyzed to the corresponding acids during dissolution of the fibre. Of the values for aspartic and glutamic acid in Table , approximately 60% of the amount shown Cited by: Step 1 is the conversion of an aromatic amine to a diazo compound (i.e. Ar-NH2 → Ar-N2+), a process known as diazotization, and step 2 is the reaction of the diazo compound with a phenol, naphthol, aromatic amine, or a compound that has an active methylene group, to produce the corresponding azo dye, a process known as diazo coupling (e.g. Ar-File Size: KB. Prolonged storage or exposure to acidic fumes in the atmosphere converts the sodium sulphonate (SO 3 Na) group to the SO 3H group, which results in a loss of solubility of the dyes. During dissolution of the dye, therefore, addition of sodium carbonate is required to obtain the sodium salt of the sulphonic acid . The reaction of thiol-choline with the VS disperse dyes to give a water-soluble cationic dye. Download: Download full-size image; Proposed dyeing mechanism when dyeing cationic reactive dyes on polyamide fibres under alkaline conditions. Download: Download full-size image; Absorption and reaction of choline-thioether-ethylsulphone.
The isothermal sorption of a series of thiadiazolyl azo dyes to be used as disperse dyes for polyester fibres has been carried out using supercritical CO2 as the dyeing medium. The main problems of acute toxicity with textile dyes are skin irritation and skin sensitisation, caused mainly by reactive dyes for cotton and viscose, a few acid dyes on polyamide fibres and disperse dyes for polyester, polyamide and acetate by: When dealing with aromatic compounds, you often need to predict the acidities and the basicities of double bond–containing rings, including aromatic rings. For example, you may need to determine which one of two double bond–containing rings is more acidic, such as the molecules shown here. Cyclopentadiene and cycloheptatriene—which is more acidic? dyes are resistant to degradation due to their fused aromatic ring structure). Some disperse dyes have good ability to bioaccumulation, an d the azo and nitro compounds are reduced in.