Effect of heat setting on dimensional stability and dyeing properties of poly(lactic acid) fibres

Abstract

A study has been conducted into the effect of heat setting on the dimensional stability and dyeing properties of spun and false‐twist texturised poly(lactic acid) yarn. It has been shown that acceptable levels of dimensional stability can be achieved after heat setting for 30–45 s at 130 °C, false‐twist texturised yarn exhibiting greater shrinkage than spun yarn. The exhaustion level and visual colour yield of a number of disperse dyes have been evaluated on each type of poly(lactic acid) yarn and shown to be essentially independent of the time of heat setting.

Effect of disperse dye structure on dye sorption onto PLA fiber

“…Among 11 dyes that have been found to have less than 70% sorption on PLA, 11 have solubility parameters greater than 25.0 (J/cm) 0.5 , but one dye has a solubility parameter above this value. Six dyes that have been reported to have greater than 70% sorption on PLA have a solubility parameter less than 25.0 (J/cm) 0.5 , which is close to that of PLA, 20.2 (J/cm) 0.5 [4]. However, a linear regression of the percentage sorption against the solubility parameters of the dyes gives an R 2 of only 0.228, and the calculated solubility parameters of the dyes therefore have poor agreement with their percentage sorption on PLA.…”

“…PLA fiber is most commonly dyed with disperse dyes. One major concern with PLA is that only a limited number of disperse dyes have been found to have good sorption on PLA at the appropriate dyeing temperature [1][2][3][4][5][6][7]. PLA filaments with higher melting points have yielded greater dye sorption in the cross section of the filaments than have PLA filaments with lower melting points [8].…”

“…Because high percentage dye sorption on PLA is important, the sorption of disperse dyes onto PLA at 100 and 110 • C has been explained in an earlier study using the solubility parameter calculated according to the group contribution method [4]. The solubility parameter of a chemical characterizes the interactions between its molecules due to dispersion forces, polar forces, and hydrogen bonding, and two chemicals tend to be mutually soluble if their solubility parameters are approximately equal [10,11].…”

Dyeing and Fastness Properties of Disperse Dyes on Poly(Lactic Acid) Fiber

“…The dyeing properties of PLA have been investigated, especially in comparison with PET fiber. The dyeing of 100% PLA fiber has been intensively studied (Scheyer & Chiweshe, 1999;Nakamura et al, 2001;Phillips et al, 2003Phillips et al, , 2004aPhillips et al, , 2004bPhillips et al, , 2004c. Owing to its relatively hydrophobic nature like PET, PLA can normally be dyed with disperse dyes.…”

Poly(lactic acid)/Organoclay Nanocomposite Fibers: Preparation, Characterization and Curcumin Natural Dyeing

“…However, PLA fiber is most commonly dyed with disperse dyes. One major concern with PLA is that only a limited number of disperse dyes have been found to have good sorption on PLA at the appropriate dyeing temperature [13][14][15][16][17].…”