Surface Reconstruction and Low-Temperature Dyeing Performances of a Poly(Lactic Acid) Filament Pretreated with a Choline Chloride and Oxalic Acid Deep Eutectic Solvent

Abstract

Poly(lactic acid) (PLA) is considered the best candidate biobased material alternative to petroleum-based polyethylene terephthalate due to its renewability and biodegradability. However, the crucial dyeing issue of PLA filament limits its applications in the textile industry. Herein, a green deep eutectic solvent (DES) consisting of choline chloride and oxalic acid was employed for the surface reconstruction of the PLA filament. Owing to the synergistic contribution effect of physical etching and chemical modification from the DES, the surface roughness and chemical activity of the PLA filament improved significantly, thereby conferring potent low-temperature dyeing performances. The DESmodified PLA filament can achieve K/S value and dye uptake at 90 °C commensurate to those of the PLA filament at 110 °C with no decay on the dry and wet rubbing fastness. This work demonstrates a promising approach for the low-temperature dyeing of PLA filaments, enabling the practical applications of PLA filaments.

Hydrophilic Modification of Polylactic Acid Fiber and the Usage of Natural Dye for Multi-Levered Improvement of the Fabric Staining Depth and the Stability Effect

“…This observation could be attributed to the disruption of chemical bonds within the extended polymer chain of PLA resulting from the modification process. The introduction of DES led to the breaking of the long chain of PLA-1 . In the plasma treatment, some surface bonds were broken and new ones were made on the surface of PLA.…”

“…(3) PLA exhibited a low melting point and was soluble in alkaline conditions, rendering it unsuitable for staining at elevated temperatures or under alkaline conditions. 7 (4) Various factors, such as temperature, acidity, and dye structure, could significantly influence the outcome of the staining process. 8,9 The staining of PLA could be carried out on fibers, yarns, or fabrics, but direct staining at the fiber stage was not a widely practiced method.…”

A novel and eco‐friendly approach for dyeing polyester fabrics by liquid disperse dyes treated with deep eutectic solvent

“…Herein, conventional disperse blue 79 and disperse red 343 are denoted by C‐Blue 79 and C‐Red 343, respectively. The same reductive alkali washing treatment was performed on the dyed polyester fabrics, that is, the dyed samples were washed and immersed in cold water, then stirred in a reduction cleaning solution (2 g/L sodium hydroxide and sodium bisulphite with a bath ratio of 1:100) at 80°C for 15 minutes 15 . Finally, the obtained samples were washed in hot and cold water, respectively, and then dried for testing.…”

“…Zhang et al modified polyethylene terephthalate (PET) fabrics by choline chloride‐oxalic acid DES to convert the surface of PET fabrics from hydrophobic to hydrophilic without changing their crystal structure and mechanical properties 14 . In our early studies, DES was applied to reconstruct the surface of Polylactic acid (PLA) fibres with excellent dyeing properties, demonstrating the role of DES in facilitating the dyeing process of fibres 15 . In addition to its application in the surface modification of fibres, DES can also be used for the dispersion and modification of dyes and inorganic substances.…”

“…14 In our early studies, DES was applied to reconstruct the surface of Polylactic acid (PLA) fibres with excellent dyeing properties, demonstrating the role of DES in facilitating the dyeing process of fibres. 15 In addition to its application in the surface modification of fibres, DES can also be used for the dispersion and modification of dyes and inorganic substances. When rhodamine B was dissolved by DES of capric acid/ tetrabutyl ammonium chloride, the particle size distribution of the dye changed.…”