Molecular surface area based predictive models for the adsorption and diffusion of disperse dyes in polylactic acid matrix

Xu, Sha; Chen, Jiangang; Wang, Bijia; Yang, Yiqi

doi:10.1016/j.jcis.2015.07.028

Cited by 9 publications

(7 citation statements)

References 54 publications

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“…Overall, Figure reflects the findings that disperse dyes with different solubility in the same solvent could display different isotherms . Increasing the proportion and particle size of dyes in aggregated form resulted in a non‐linear isotherm.…”

Section: Resultssupporting

confidence: 64%

“…Figure also shows the pseudo isotherm of CI Disperse Blue 79 with relatively high solubility in liquid paraffin at 130 °C . The sorption of dye increased linearly up to saturation as the pseudo dye equilibrium concentration increased.…”

Section: Resultsmentioning

confidence: 94%

“…Difference between pseudo isotherms of dyes with different solubility in the same solvent Figure 8 shows the pseudo isotherm of CI Disperse Blue 56 with relatively low solubility in liquid paraffin at 130°C [30]. The isotherm could be well fitted with the Langmuir model.…”

Section: Microencapsulated Disperse Dyes With Larger Uptake Than Un-mmentioning

confidence: 91%

“…The reason that the slope decreased is that the proportion and size of dye in its aggregated form increased as the pseudo-equilibrium concentration exceeded solubility, therefore these aggregates temporarily block the channel, preventing other dyes from entering the channel. Figure 8 also shows the pseudo isotherm of CI Disperse Blue 79 with relatively high solubility in liquid paraffin at 130°C [30]. The sorption of dye increased linearly up to saturation as the pseudo dye equilibrium concentration increased.…”

Section: Microencapsulated Disperse Dyes With Larger Uptake Than Un-mmentioning

confidence: 98%

“…These single molecules of dyes in the sorption channel will lead to an accumulation of dyes and this accumulation makes some single molecules transform into stable crystals (Figure 9), as shown in the lower side of Figure 10b. Because of the larger size, low diffusion rate, and resistance to transforming into other forms (Figure 9), these stable crystals are likely to temporarily block the channel, preventing other dyes from moving out from the [30] sorbent channel into the liquid phase. Therefore, the dye uptake with metastable crystals is temporarily higher than that with stable crystals.…”

Section: Microencapsulated Disperse Dyes With Larger Uptake Than Un-mmentioning

confidence: 99%

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Improved mechanism of polyester dyeing with disperse dyes in finite dyebath

Yang

2017

Coloration Technology

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A new sorption mechanism of polyester dyeing with disperse dyes in water is proposed. It is considered dye aggregates could not be sorbed unless they turn into single molecules. However, this theory could not explain numerous sorption phenomena: sorption continues when equilibrium dye concentration exceeds its solubility; dyeing at long liquor ratio, using microencapsulated or crystal‐modified dyes do not change concentration of single dye molecules or dye solubility, but increase sorption rate and quantity in a fixed time. We demonstrate that both single and aggregated dye molecules could be sorbed using CI Disperse Blue 56. Because of the large size and low diffusion rate, dye aggregates could temporarily block sorption channel and prevent entry of other dyes. Therefore, only using extra more dyes could get a dark colour. Series of approaches could be proposed to reduce or eliminate the sorption problems caused by aggregates using the new sorption mechanism.

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Section: Resultssupporting

confidence: 64%

Section: Resultsmentioning

confidence: 94%

Section: Microencapsulated Disperse Dyes With Larger Uptake Than Un-mmentioning

confidence: 91%

Section: Microencapsulated Disperse Dyes With Larger Uptake Than Un-mmentioning

confidence: 98%

Section: Microencapsulated Disperse Dyes With Larger Uptake Than Un-mmentioning

confidence: 99%

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