Effects of molecular structure on dyeing performance and colour fastness of yellow dyestuffs applied to polypropylene fibres in supercritical carbon dioxide

Abstract

Thirteen dyestuffs of four chemical classes (quinophthalone, anthraquinone, isothiazole‐fused anthrone and pyridone azo) were applied for the dyeing of unmodified polypropylene fibres in supercritical carbon dioxide. From these 13 dyestuffs, three dyestuffs that have a pure yellow hue and good dyeability for polypropylene fibres were found. The results of a dyeability test using the 13 dyestuffs suggested that the affinity for polypropylene fibres requires, in the structural character of the dyestuff molecule, not only extreme hydrophobicity but also high aliphaticity. The isothiazole‐fused anthrone nonanamide dyestuff and two types of N‐butyl substituted pyridone azo dyestuffs were examined for build‐up and colour fastness properties. The light fastness of the dyed fabric was not so good. The ratings of fastness to washing, perspiration and rubbing ranged from excellent to fairly good with the increase of the depth of shade. From the relationship between the build‐up curve and the colour fastness, it was found that the dyestuff of the isothiazole‐fused anthrone nonanamide is suitable for polypropylene dyeing in a pale or medium shade, and that the two types of N‐butyl substituted pyridone azo dyestuffs are suitable in a deep shade.

Drug loading of polymer implants by supercritical CO 2 assisted impregnation: A review

“…Natu et al have shown that timolol maleate which is a hydrophilic drug is more impregnated in poly(ε-caprolactone) PCL blended with poly(oxyethylene-b-oxypropylene-b-oxyethylene) (PCL/POE) copolymer than in PCL blended with poly(ethylene-co-vinyl acetate) (PCL/ PEVA) copolymer because of the higher hydrophilicity of the first copolymer [44]. On the contrary is noticed for hydrophobic compounds that prefer polymers with long alkyl-chains and presenting a strong hydrophobicity [36,85,86]. For example, hydrophobic extracts from juca fruits were found to be more loaded into N-carboxybutyl chitosan than into two other commercial dressings due to its higher hydrophobicity and to favorable interactions, thus increasing the partitioning coefficient of the molecules in this matrix [36].…”

Effect of Supercritical Carbon Dioxide on Dyeability and Physical Properties of Ultra-High-Molecular-Weight Polyethylene Fiber

“…This result is probably due to overdyeing, in which the dye molecules accumulate on the fiber surface. The accumulated dye was easily eliminated by rubbing and sublimation, resulting in the lower grade [48].…”

Eco-Friendly Disperse Dyeing and Functional Finishing of Nylon 6 Using Supercritical Carbon Dioxide

“…As a consequence in the last few decades, various researchers focused their efforts on the synthesis of new dyes for these fibers [7][8][9][10][11][12]. The success of dyeing synthetic textiles, particularly polyester [13][14][15][16][17][18][19][20][21][22][23], with disperse dyes in scCO2 prompted research application of this technique to other synthetic fibers such as polypropylene [24], and aramid fibers [25] or alternative natural fabrics like cotton [26][27][28].…”