Rate Of Dye Uptake Research Articles

Nanocellulose prepared with γ-valerolactone pretreatment and its enhancement in colored paper

New techniques are always demanded to pursuit green and economical ways for nanocellulose preparation. We herein proposed to use γ-valerolactone (GVL) to facilitate the nanocellulose preparation from bleached bamboo pulp fibers as a green and sustainable pretreatment. The GVL pretreatment caused the bamboo fibers to destruct, resulting in an obviously increased fine fiber content, which was systematically studied to disclose the influence of different factors on the fiber changes. The optimum GVL pretreatment conditions were determined as reaction time of 4 h, reaction temperature of 140 °C and the ratio of GVL to water of 4:1. Notably, the GVL pretreatment caused negligible changes in the functional groups on cellulose, as well as its crystalline structure. The resultant nanocellulose (i.e. G-CNF) had a width of ca. 47 nm and it showed good adsorption capacity towards RR195 dye since an impressive dye uptake rate of 46.81 % was attained. The incorporation of G-CNF significantly improved the coloring performance and the ∆E (color difference) value reached up to 33.73. Improvements in the mechanical properties of RR195 dyed paper were also observed with the incorporation of G-CNF. This work sheds light on the nanocellulose preparation with GVL pretreatment and demonstrates a feasible way to apply the resultant nanocellulose in the colored paper manufacture.

Investigating the optimum conditions for azo dye (methyl orange and methyl red) decolorization from aqueous solution using oyster mushroom (Pleurotus ostreatus): a mycoremediation approach

Since conventional dye removal techniques require a substantial amount of energy and chemicals, this study evaluated the utilization of Pleurotus ostreatus, a species of fungus, in an environmentally beneficial mycoremediation approach to decolorize two azo dyes, methyl orange (MO) and methyl red (MR), in a liquid medium. Pleurotus ostreatus was utilized under standard circumstances in the solutions containing 0.05% (w/v) MO and 0.05% (w/v) MR, without undergoing any genetic modifications. By analyzing the effects of time (6, 12, and 18 days), temperature (15 °C to 40 °C), pH (4 to 7), and inoculum volume (1 to 25 mL) on the decolorization rate of P. ostreatus, the ideal environment for the decolorization of MO and MR was determined. The highest rate of decolorization was evident at 25 °C temperature, pH 7 within 18 days of incubation, P. ostreatus could decolorize 0.05 g MO up to 97% when added in 10 mL inoculum volume on the other hand 0.05 g MR up to 93% in 15 mL inoculum volume at pH 6. Furthermore, the dye uptake rate after 18 days for MO was 59.25% and MR was 53.97% which indicated that P. ostreatus had a better uptake efficiency for MO than MR. Based on its ability to decolorize both MO and MR under suitable circumstances, the study concludes that P. ostreatus offers an appreciable mycoremediation approach for removing dye pigments from industrial wastewater.

Multi-site sulfonation of lignin for the synthesis of a high-performance dye dispersant

Sulfonated lignin-based dye dispersants have intensively attracted attention due to their low cost, renewability and abundant sources. However, their utilization is limited by the low content of sulfonic groups and high content of hydroxyl groups in their complex lignin structure, which results in various problems such as high reducing rate of dye, severe staining of the fibers and uneven dyeing. Here, the multi-site sulfonated lignin-based dispersants were prepared with high sulfonic group content (2.20 mmol/g) and low hydroxyl content (2.43 mmol/g). When using it as the dispersant, the dye uptake rate was improved from 69.23 % to 98.55 %, the reducing rate was decreased from 20.82 % to 2.03 %, the K/S value was reduced from 0.69 to 0.02, and the particle sizes in dye system before and after high temperature treatment were stabilized below 0.5 μm. Besides, the dispersion effect was significantly improved because no obvious separation between dye and water was observed even if without the assistance of grinding process. In short, the multi-site sulfonation method proposed in this work could remarkably improve the performances of the lignin-based dye dispersants, which would facilitate the development of the dye dispersion and the high value utilization of lignin.

Adsorption, kinetics, and thermodynamic study of dyeing the Scutellaria Orientalis L as an eco-friendly natural colourant on cotton fabric

The adsorption isotherm, thermodynamic parameter, and kinetics study for dyeing without mordanting cotton fabric dyed with natural dye obtained from an aqueous extract of the Scutellaria Orientalis were investigated using, as optimal conditions, at pH of 5 a material to liquor ratio (MLR) of 1:100, an initial dye concentration of 1.0/l and contact time (20–90 min.). The effect of the temperature and dyeing time (from 20–90 min.) on dyeing was evaluated using three different temperatures (from 60, 80, and 90°C). Also, the adsorption isotherms have been analyzed by Langmuir and Freundlich models. It is revealed that the adsorption kinetics was found to follow the pseudo-first-order kinetic model, the obtained adsorption isotherm was found to be suitable for both Langmuir and Freunlich adsorption isotherm, and the dyeing process is exothermic. The rate of dye uptake and thermodynamic parameters have also been calculated and discussed.

Study on the dyeing properties of Chinese fir with Cinnamomum camphor pigment by premordant dyeing

ABSTRACT Wood staining can improve the quality of Chinese fir. In this study, Cinnamomum camphora natural plant pigment was used as a substitute for synthetic dyes to stain Chinese fir, and the staining performance was enhanced through pre-mordanting with alum. The dyeing effects of direct dyeing and mordant dyeing were compared, and the factors and levels influencing color difference, wash fastness, and light fastness were investigated through an orthogonal experimental design. The results showed that mordanting time had the greatest influence on color difference and lightfastness, while mordanting temperature had the greatest influence on washfastness. After pre-mordanting, the washfastness of Chinese fir improved to a level of 2–3, while the improvement in lightfastness was not significant. Pre-mordanting increased the dye uptake rate by 6.67%. Scanning electron microscopy revealed that NaOH pretreatment opened the wood pores and increased the flow channels for dye liquor. Infrared analysis indicated that O-H in wood fibers formed complexes with Al3+ in the mordant, resulting in a decrease in the characteristic peak intensity of O-H. X-ray diffraction analysis showed that the attractive effect of Al3+ vacant orbitals on O-H partially influenced the ordered arrangement structure in the crystalline region.

Natural deep eutectic solvent: A novel and green mordant for the natural dye

Applying natural dye is a green and available approach for the dyeing and simultaneous functionalizing of textiles. However, the commonly used mordant of metal ions to improve the dyeing effect results in massive toxic wastewater production, which decreases the environmentally friendly characteristics. In this work, the mordant and water substitute ability of choline chloride-ethylene glycol natural deep eutectic solvent (NADES), defined as the mixture of two or more primary metabolites at a particular composition becoming liquids via H-bond forces, was investigated during the dyeing process because it has been used as a green extraction and stability agent for the natural dye. To this end, the NADES and metal ion were used in three mordant dyeing wool and cotton processes of Platycodon Grandiflorus root dye, and the color and functionalization effect were compared to verify the method advance. The result indicated that natural deep eutectic solvent had a better effect as a mordant than the metal ion by enhancing the dye solubility, the dye uptake rate of fiber, and the dye polymerization trend via rich H-bonds among fiber, dye, and NADES. The dyed textile had an excellent functional performance, including UV resistance, antibacterial, antioxidation, and burning difficulty, with the preferable fastness. This method also showed good universality for other natural dyes and NADESs. Compared to the existing mordant dyeing technologies, the proposed technology had lower chemical reagent usage, cost, and energy consumption, whose residual solvent had good reusability for at least 10 times and better degradability. Overall, this paper supplied a potential and green approach using NADESs as alternatives to metal ions for the mordant dyeing textile using natural dye.

Preparing cationic dyeable polyamide 6 filaments by combining the masterbatch technique with melt copolymerization

Cationic dyeable polyamide 6 (CD-PA6) fiber, as a novel functional polyamide 6 (PA6) fiber, conforms to people's requirements for fashion clothing. However, due to the limitation of the hetero-end groups after caprolactam hydrolysis, it is difficult to introduce comonomers into the PA6 molecular chain to prepare PA6-based polymers with a certain molecular weight and maintain the original physical properties and spinnability. In this paper, through molecular design of PA6 segments, 5-sulfoisophthalic acid monosodium salt (5-SSIPA) was introduced into PA6 by copolymerization, and a CD-PA6 masterbatch with an addition amount of 10 wt% was prepared. CD-PA6 were prepared by blending with pure PA6 with masterbatch technology. The melt-spinning method was used to prepare CD-PA6 filaments, and they were woven into fabrics. The results show that the CD-PA6 masterbatch and PA6 have good blending compatibility. CD-PA6 filaments and fabrics maintain the excellent physical properties of PA6. When the addition amount of 5-SSIPA is 3%, the dye uptake rate of the cationic pigment exceeds 90%, and it has color affinity and excellent color fastness.

Influence of cross-section shape on structure and properties of Lyocell fibers

Three kinds of Lyocell fibers with different cross-sections including circular, H-shape, and Y-shape (abbreviated as O-, H-, and Y-Lyocell) were prepared by a dry-jet wet spinning method. The effects of cross-sectional shape on structure and properties of Lyocell fibers were evaluated. The results showed H-Lyocell and Y-Lyocell exhibited triangular and dumbbell cross-sections, respectively, due to die swell. Both non-roundness factor and crystallinity of different cross-sectional Lyocell fibers were in the order of H-Lyocell > Y-Lyocell > O-Lyocell. All cross-sectional Lyocell fibers showed similar values of fineness and tensile strength. The profiled Lyocell fibers were superior to circular Lyocell fibers in terms of luster, dyeing properties, and moisture regain. The dye uptake and fixation rate of Lyocell fibers were influenced by shape in the order H-Lyocell > Y-Lyocell > O-Lyocell; while for luster and moisture regain the order was Y-Lyocell > H-Lyocell > O-Lyocell. Profiled Lyocell fibers are expected to open broader prospects in different textile or composite fields due to their various advantages versus conventional circular Lyocell fibers.

Chitosan Deposited onto Fumed Silica Surface as Sustainable Hybrid Biosorbent for Acid Orange 8 Dye Capture: Effect of Temperature in Adsorption Equilibrium and Kinetics.

Chitosan was deposited on fumed silica without the addition of cross-linkers or activating agents. The chitosan surface layer has a high affinity toward organic molecules, e.g., Acid Orange 8 (AO8) dye, robust to a broad range of simulated conditions (variance with respect to temperature, time, and concentration of solute). Experimental equilibrium data were analyzed by the generalized Langmuir equation taking into consideration the energetic heterogeneity of the adsorption system. The effect of temperature on dye uptake and adsorption rate was studied. According to the calculated thermodynamic functions ΔG°, ΔH°, and ΔS° from the equilibrium data at different temperatures, the adsorption of AO8 onto chitosan–fumed silica composite is exothermic and spontaneous. The studies of temperature effect on adsorption equilibrium show that the maximum adsorption capacity (determined from the Langmuir–Freundlich equation) of synthesized composite toward AO8 is about one-third higher in the case of an isotherm measured at 5 °C than this value obtained for the isotherm measured at 45 °C. The quantitative binding of dye molecules to chitosan coating on the surface of silica was proved by 1H MAS NMR. The deep kinetics study through the application of various theoretical models—the first-order equation, pseudo-first-order equation, second-order equation, pseudo-second-order equation, mixed first, second-order equation, and multiexponential equation—was applied for getting inside the mechanism of AO8 binding to the chitosan coating. Structural characteristics of chitosan-coated silica were obtained from the low-temperature adsorption/desorption isotherms of nitrogen and imaging by scanning electron microscopy. The effects of a synthetic route for polymer coating on thermal stability and the ability to degrade were studied by differential scanning calorimetry.

Permeation of Molecules through Astroglial Connexin 43 Hemichannels Is Modulated by Cytokines with Parameters Depending on the Permeant Species.

Recent studies indicate that connexin hemichannels do not act as freely permeable non-selective pores, but they select permeants in an isoform-specific manner with cooperative, competitive and saturable kinetics. The aim of this study was to investigate whether the treatment with a mixture of IL-1β plus TNF-α, a well-known pro-inflammatory condition that activates astroglial connexin 43 (Cx43) hemichannels, could alter their permeability to molecules. We found that IL-1β plus TNF-α left-shifted the dye uptake rate vs. dye concentration relationship for Etd and 2-NBDG, but the opposite took place for DAPI or YO-PRO-1, whereas no alterations were observed for Prd. The latter modifications were accompanied of changes in Kd (Etd, DAPI, YO-PRO-1 or 2-NBDG) and Hill coefficients (Etd and YO-PRO-1), but not in alterations of Vmax. We speculate that IL-1β plus TNF-α may distinctively affect the binding sites to permeants in astroglial Cx43 hemichannels rather than their number in the cell surface. Alternatively, IL-1β plus TNF-α could induce the production of endogenous permeants that may favor or compete for in the pore-lining residues of Cx43 hemichannels. Future studies shall elucidate whether the differential ionic/molecule permeation of Cx43 hemichannels in astrocytes could impact their communication with neurons in the normal and inflamed nervous system.

Study the dyeing behavior of wool fabric using henna extract in decamethyl cyclopentasiloxane (D5) medium

In this study, an eco-friendly dyeing method of wool fabric was adopted using natural dye extracted from henna leaves in the Decamethyl Cyclopentasiloxane (D5) medium. D5 was used to reduce the consumption of the high amount of water and salt needed in traditional dyeing. Wool fabric dyed with different amounts of Henna extract/Decamethyl Cyclopentasiloxane at different dyeing temperatures (40 and Scanning electron microscopy (SEM) and Energy-dispersive X-ray spectroscopy (EDX) were used to study the effect of the D5 on the morphology and elemental composition of the fiber surface. The dyeing and fastness properties of the dyed fabric were also investigated. The results showed that the dye uptake, fixation rate, and color strength of the samples dyed in this system were higher than water-based dyed samples. The dye uptake rates of the samples dyed in this system were 77–83% as compared with 64–71% for the water-based dyed samples. SEM and EDX results illustrated that dyeing in the D5 medium did not show any adverse effect on the morphology and elemental composition of the fiber surface.

Study on a water-saving and salt-free reactive dyeing of cotton fabrics in non-aqueous medium of liquid paraffin system

Aiming at solving the problems existed in conventional cotton dyeing with reactive dyes, such as low dye-uptake, high salt-consumption, and large wastewater-emission, a water-saving and salt-free reactive dyeing of cotton fabrics in non-aqueous medium system was studied. The effect of pickup rate, alkali concentration and fixation temperature on color yield (K/S value) and levelness of dyed fabric was investigated, and the dyeing mechanism in non-aqueous medium system was preliminarily studied. The results showed that, the optimal dyeing process for Reactive Black KN-B in the non-aqueous medium of liquid paraffin system was as follows: pickup rate, 120%; Na2CO3 concn., 30 g/L; fixation at 75 °C for 30 min. And relatively higher Na2CO3 concn. of 50 g/L and stronger fixation conditions of 85 °C for 40 min were required for Reactive Orange K-7G. In the non-aqueous medium system, the exhaustion rate achieved almost 100% with the absence of salt and the total fixation rate reached about 90% for both Reactive Black KN-B and Reactive Orange K-7G under their optimal dyeing conditions, respectively. The high dye-uptake rate might be ascribed to ‘pushing’ force originated from the interfacial tension between hydrophilic dyes and hydrophobic paraffin oil, while the high fixation rate could be mainly due to much less hydrolysis of reactive dyes in the non-aqueous medium system. Compared to conventional reactive dyeing of cotton fabrics in the water medium, this novel dyeing technology can significantly reduce the consumption of water, chemicals and dyes, which is beneficial to lower the burden of dyeing wastewater treatment and achieve an eco-dyeing approaching.

Stimulation of the A2B Adenosine Receptor Subtype Enhances Connexin26 Hemichannel Activity in Small Airway Epithelial Cells.

Adenosine release and connexin (Cx) hemichannel activity are enhanced in the respiratory epithelium during pathophysiological events such as inflammation. We analysed the interplay between Cx channels and adenosine signalling in human respiratory airway epithelium using the Calu-3 cell line as a model. The Cx hemichannel activity in Calu-3 cells was evaluated by dye uptake assays. The expressed Cx isoforms and adenosine receptor subtypes were identified by PCR and western blot analysis. Pharmacological and molecular biological experiments were performed to analyse the involvement of the different adenosine receptor subtypes, the induced signalling pathways and the contribution of specific Cx isoforms to the hemichannel activity. The adenosine receptor agonist 5'-N-ethylcarboxamidoadenosine (NECA) increased the dye uptake rate in Calu-3 cells. The pannexon and Cx hemichannel inhibitor carbenoxolone (CBX) did not supress the dye uptake at pannexin-specific concentrations (100 µM). High CBX concentrations or the inhibitor La3+, both effective on Cx hemichannels, were needed to inhibit the dye uptake. The NECA-related increase of dye uptake depended on enhanced cAMP synthesis and subsequent activation of the protein kinase A (PKA) as shown by quantification of cAMP levels and pharmacological inhibition of the adenylyl cyclase and the PKA. Further pharmacological inhibition as well as knockdown experiments with specific siRNA showed that the A2B adenosine receptor was the subtype mainly responsible for the increased dye uptake. The NECA-related increase of the dye uptake rate correlated with a decrease of Cx43 mRNA and an increase of Cx26 mRNA content in the cells as well as Cx26 protein synthesis and was inhibited by Cx26 knockdown using Cx26 siRNA. Of note, a siRNA-induced knockdown of Cx43 increased the content of Cx26 mRNA and correspondingly the dye uptake rate. The Calu-3 cell model shows that stimulation of the A2B adenosine receptor subtype activates synthesis of cAMP. cAMP activates PKA and induces thereby an increase in Cx26 and a decrease in Cx43 mRNA levels. As a result, the synthesis of Cx26 is reinforced, leading to an enhanced Cx hemichannel activity. The report identifies a mechanism that integrates adenosine release and Cx hemichannel activity and shows how adenosine signalling and Cx channels may act together to promote persistent inflammation, which is observed in several chronic diseases of the respiratory airway.

Performance of activated carbon derived from Cymbopogon winterianus distillation waste for scavenging of aqueous toxic anionic dye Congo red: Comparison with commercial activated carbon

ABSTRACT Activated carbon derived from distillation waste of java citronella (Cymbopogon winterianus) by phosphoric acid activation along with commercial activated carbon was evaluated for their scavenging potential toward toxic anionic dye Congo red. Prepared activated carbon was characterized with Fourier transformation infrared spectroscopy, scanning electron microscope, and points zero charge (pHzp). Commercial activated carbon scavenged higher quantity of dye than prepared activated carbon; however, dye uptake rate was faster onto latter. Adsorption behavior is best represented by Freundlich equilibrium and pseudo-second-order kinetic model. Thermodynamics parameters indicate the exothermic nature of reaction. Desorption study allows the superior recycle performance of prepared activated carbon.

Interactions of modified Gemini surfactants: Interactions with direct dyes and dyeing properties in cotton fabrics

This study investigated dye–surfactant interactions between a series of modified Gemini surfactants and commercial direct dyes in aqueous solution and their corresponding effects on cotton fabric dyeing. A surface tension meter was also used to measure surface activities of compounds containing electrolyte under conditions similar to those in dyeing processes. The surface tension measurements showed lower than normal surface tension in surfactant solutions containing electrolyte. From the UV-Vis spectra, the isosbestic point indicated that dye–surfactant complexes had formed and existed as hydrophilic interaction between direct dyes and modified Gemini surfactants. When dyeing cotton fabric with red dye and orange dye, the presence of these surfactants decreased dye uptake rate but increased for blue dye because the dye–surfactant interaction had formed a hydrophilic complex.

A kinetic and thermodynamic study of lac dye adsorption on silk yarn coated with microcrystalline chitosan

The coating of silk yarn with microcrystalline chitosan (MCCh) was carried out using the ultrasonic‐assisted method at a pulsed wave frequency of 80 kHz, which only had a slight impact on the yarn as measured by changes in Young's modulus and percentage of elongation compared with untreated silk. A significant enhancement of lac dye uptake onto MCCh‐coated silk yarn compared with the untreated silk was observed. The rate of dye uptake at different temperatures onto silk yarn coated with MCCh was investigated. It was found that the adsorption rate constant and diffusion coefficient both increased with increasing temperature, as a result of a diffusion kinetically controlled process with a diffusion activation energy of 9.40 kJ mol−1. This suggests that dye adsorption on silk yarn coated with MCCh is a physisorption process. The free energy change (∆G○), enthalpy change (∆H○) and entropy change for dye adsorption were also determined, and the negative values of ∆G○ and ∆H○ obtained indicated that the lac dye adsorption process is both spontaneous and exothermic.

Removal of methyl orange from aqueous solutions by adsorption on cellulose hydrogel assisted with Fe2O3 nanoparticles

Cellulose hydrogel, fabricated from cellulose solution in an LiOH/urea aqueous system at low temperature, was successfully applied for in situ synthesis of Fe2O3 nanoparticles to obtain hybrid magnetic nanomaterials. The microporous structure of cellulose hydrogel at wet state provided reaction chambers to synthesize the Fe2O3 nanoparticles. The structure and properties of the magnetic cellulose/Fe2O3 hydrogels were characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, magnetic detection, thermal analysis, etc. The results revealed that the magnetic cellulose/Fe2O3 hydrogels exhibited efficient adsorption of methyl orange in the aqueous solution as a result of the microporous structure, large surface area, and affinity for organic dyes. The equilibrium process was described well by the Langmuir isotherm model, showing a monolayer adsorption. From kinetic experiments, the adsorption process followed the pseudo-second-order kinetic model, indicating that the overall rate of dye uptake could be controlled by external mass transfer at the beginning of adsorption, while intra-particle diffusion controlled the overall rate of adsorption at a later stage. This work provided an attractive adsorbent for removing hazardous materials from wastewater.

Effect of Nonionic Surfactant on the Micro‐Emulsifying Water in Silicone Media

AbstractReverse micro‐emulsion dyeing technology shows a high dye uptake and fixation rate, and effectively decreases the amount of waste water in the textile industry. However, the influence of surfactants and co‐surfactants on micro‐emulsifying water in reverse micro‐emulsions has not been investigated. In this study, the micro‐emulsifying mechanism in silicone media and the influence of nonionic surfactants and co‐surfactants on micro‐emulsifying water have been investigated. The results show that a large amount of water can be emulsified using alcohol‐polyoxyethylene ethers, especially under 3–5 ethylene oxide groups in molecular structure. As co‐surfactant, alcohol which contains 4–9 carbon chains could spontaneously form reverse micro‐emulsions in silicone media. The effects of solution pH and ionic strength on the amount of emulsified water were also evaluated. The results show that a large amount of water could be emulsified in silicone media at solution pH 2–9. Meanwhile, the amount of emulsified water decreased with increasing ionic strength. Thus, the optimum conditions for water emulsification are low ionic strength and pH between 2 and 9.

Study of hydrolytic kinetics of vinyl sulfone reactive dye in siloxane reverse micro-emulsion

Reactive dyes maintain a long reaction with fiber and show a high dye uptake and fixation rate, and effectively decrease the dyeing waste water in siloxane reverse micro-emulsion. However, little research has been carried out into the hydrolysis reaction of reactive dyes in reverse micro-emulsion. In this study, Reactive Blue 19 was selected as a model vinyl sulfone reactive dye to study its hydrolysis in siloxane reverse micro-emulsion. The hydrolysis reaction was analyzed using high performance liquid chromatography. The results show that the hydrolysis rate of vinyl sulfone dyes in siloxane reverse micro-emulsion was slower than that in a traditional bath. Influences due to the ratio of aqueous dye solution to siloxane, non-ionic surfactant, cellulose fiber, and temperature on the hydrolysis reaction of vinyl sulfone reactive dye were also researched. The results show that with more aqueous solution emulsified in the siloxane media, the hydrolysis reaction of vinyl sulfone dye is faster. Reactive dyes were emulsified into a water micro-environment with non-ionic surfactant, which formed reverse micro-emulsion, and decreased the content of free water; this further influenced the hydrolysis of reactive dye.

Investigation of stain-resistant cationic dyeable nylon 6 modified with sodium salt of 5-sulfoisophthalic acid and polyethylene glycol

Nylon 6 can be dyed with acid dyes and therefore it can also be stained by natural or artificial acid dyes existing in some foods and drinks when they are spilled on nylon fabrics. In this study, cationic dyeable polyamide (CD-PA6) was synthesized with sodium salt from 5-sulfoisophthalic acid (5-SSIPA) and easily cationic dyeable polyamide (ECD-PA6) was prepared with 5-SSIAP and polyethylene glycol (PEG). The influence of the chemical modification to CD-PA6 and ECD-PA6 on the resultant structures were characterized by wide angle X-ray diffraction (WAXD) and Fourier transform infrared spectroscopy (FT-IR), and their thermal properties were tested by differential scanning calorimetry (DSC) and thermogravimetric analysis (TG). The effects of varying 5-SSIPA content on the cationic dye uptake and acid dye resistance rate were also investigated, as well as mechanical properties of the modified PA6. Incorporating PEG not only destroyed the regularity of molecular chain arrangement and created more amorphous regions in the ECD-PA6 samples, but also changed the nylon 6 from α-form to γ-form. Results revealed a considerable improvement in cationic dye uptake and acid dye resistance rate in the modified fibers compared with unmodified fibers.