Epoxypropyltrimethylammonium Chloride Research Articles

Preparation and application of self-emulsifying curing agent for CO2 high-pressure corrosion-resistant resin cement

In order to solve the problem that oily epoxy resin is not easy to disperse in a cement slurry system and its application is limited due to low stability, a new self-emulsifying curing agent ETB for oilfield cement slurry was prepared by using bisphenol F-type glycidyl ether (BPF), tetraethylenepentamine (TEP) and epoxypropyl trimethyl ammonium chloride (EPTAC) in three steps. The optimized synthesis conditions are n (TEP): n (BPF)= 2.6:1, 65 ℃ addition reaction for 4 h, n (EPTAC): n (TEP)= 1:1, and 75 ℃ for 2 h end-capping reaction. Finally, 20% glacial acetic acid is added for 30 min salt reaction to obtain the self-emulsifying curing agent ETB. The target product was obtained through Fourier transform infrared spectroscopy and nuclear magnetic resonance analysis. The stability shows that BPF resin lotion is uniform and stable compared to other lotions, with an average particle size of 580.9 nm. The application study of ETB emulsified BPF resin lotion shows that when the dosage is 6.0%, the fluidity index n of the resin cement slurry system is 0.887, the consistency coefficient K is 0.178 Pa.sn, the rheological property is good, the high-temperature and high-pressure water loss can be controlled within 50 mL, and the 48 h compressive strength increases by 36.05% compared with the blank cement paste. The high-pressure CO2 corrosion experiment shows that the penetration growth rate of resin cement stone is − 0.168%, which is much lower than the 455.6% of blank cement stone. Before and after corrosion, the compressive strength decline rate of blank cement stone is 25.07%, while the decline rate of resin cement stone is only 2.18%, indicating that resin cement stone has good corrosion resistance. TG-DTG and SEM were used to analyze the corrosion resistance mechanism: the BPF resin lotion was crosslinked and solidified in the cement slurry to form a film, and was tightly filled inside to form a three-dimensional network structure, thus improving the corrosion resistance.

Synthesis of iron oxide nanoparticles, characterization, uses as nanozyme and future prospects

Iron oxide nanoparticles (IONPs) have recently attracted wider attention because of their unique properties, such as superparamagnetism, larger surface area, surface-to-volume ratio and simple manufacturing process. Several chemical, physical and biological techniques have been employed to synthesize nanoparticles (NPs) with acceptable surface chemistry. This paper summarizes the approaches for producing IONPs, managing their shape and size and tailoring their properties for bioengineering, pharmaceutical and modern applications. Iron oxides have significant potential in biology, climate change mitigation and horticulture, among several fields. Surface coatings with organic or inorganic particles are one of a kind. The surface coatings of IONPs are critical to their performance because they prevent NP aggregation, reduce the risk of immunogenicity and limit non-specific cellular uptake. Chitosan is a biodegradable polymer that is applied on IONPs to coat them. Chitosan derivatives such as O-(2-hydroxyl)propyl-3-trimethyl ammonium chitosan chloride (O-HTCC; an ammonium quaternary chitosan derivative) have a long-lasting positive charge that allows them to work in different pH ranges, allowing them to interact with cell layers at physiological pH. By reacting epoxypropyltrimethylammonium chloride with chitosan, the hydro-solvent HTCC is formed. For hyperthermic treatment of patients, NPs can also be coordinated to an organ, tissue or tumor through an external attractive field. Given the increasing interest in iron NPs, the purpose of this review is to present data on IONPs, particularly chitosan-capped iron NPs, for different biomedical fields.

Quaternary ammonium salt-modified isabgol scaffold as an antibacterial dressing to improve wound healing

Chronic wounds require suitable treatment and management strategies for proper healing. Among other causes, infection delays the healing of wounds and increases the risk of wound-related complications. In this study, an inherently antibacterial and biocompatible wound dressing is developed to enhance the healing. Chemical modification of a natural polysaccharide, Isabgol with epoxypropyltrimethylammonium chloride, renders antibacterial activity to the material. This is the first report of such chemical modification of this polymer for biomedical applications. The modified material is freeze-dried to obtain porous scaffolds. 13C NMR and FTIR analysis confirmed the modification of the Isabgol polymer chains with EPTMAC. SEM analysis confirmed the porous structure of the scaffold that would allow the exchange of gases and nutrients through the matrix. The material can swell up to 17 times its initial weight, allowing it to absorb wound exudates and maintain a moist environment at the wound site. Thermogravimetric analysis and compression testing showed that the scaffold has suitable thermal and mechanical properties. The material is antibacterial and can potentially prevent infections at the wound site. In vitro studies have confirmed that these scaffolds are cytocompatible and hemocompatible. These properties indicate that the EPTMAC-modified Isabgol scaffolds would be suitable for wound dressing applications.

GRAFTING OF BORON-NITROGEN-DOPED CARBON QUANTUM DOTS ON COTTON FABRIC FOR IMPARTING ANTI-ULTRAVIOLET PROPERTIES

"In order to improve the anti-ultraviolet property and laundering durability of cotton fabrics, the cotton fabrics were cationized with epoxy propyl trimethylammonium chloride, and then boron-nitrogen-doped carbon quantum dots (BN-CQDs) were grafted onto the cationized cotton fabrics by the chemical reaction between the quaternary ammonium cation on the cotton fabrics and the carboxyl functional group on the surface of BN-CQDs. The structure, the ultraviolet protection performance and washing durability of the cotton fabrics grafted with BN-CQDs were characterized and tested. The results showed that the resultant cotton fabrics modified with BN-CQDs exhibited a very high ultraviolet protection factor (UPF). Even after 20 consecutive washings, the UPF value was still as high as 75.3, suggesting the promising potential of the modified fabrics as UV protective materials and their excellent laundering durability."

Surface functionalization and size modulate the formation of reactive oxygen species and genotoxic effects of cellulose nanofibrils

BackgroundCellulose nanofibrils (CNFs) have emerged as a sustainable and environmentally friendly option for a broad range of applications. The fibrous nature and high biopersistence of CNFs call for a thorough toxicity assessment, but it is presently unclear which physico-chemical properties could play a role in determining the potential toxic response to CNF. Here, we assessed whether surface composition and size could modulate the genotoxicity of CNFs in human bronchial epithelial BEAS-2B cells. We examined three size fractions (fine, medium and coarse) of four CNFs with different surface chemistry: unmodified (U-CNF) and functionalized with 2,2,6,6-tetramethyl-piperidin-1-oxyl (TEMPO) (T-CNF), carboxymethyl (C-CNF) and epoxypropyltrimethylammonium chloride (EPTMAC) (E-CNF). In addition, the source fibre was also evaluated as a non-nanosized material.ResultsThe presence of the surface charged groups in the functionalized CNF samples resulted in higher amounts of individual nanofibrils and less aggregation compared with the U-CNF. T-CNF was the most homogenous, in agreement with its high surface group density. However, the colloidal stability of all the CNF samples dropped when dispersed in cell culture medium, especially in the case of T-CNF. CNF was internalized by a minority of BEAS-2B cells. No remarkable cytotoxic effects were induced by any of the cellulosic materials. All cellulosic materials, except the medium fraction of U-CNF, induced a dose-dependent intracellular formation of reactive oxygen species (ROS). The fine fraction of E-CNF, which induced DNA damage (measured by the comet assay) and chromosome damage (measured by the micronucleus assay), and the coarse fraction of C-CNF, which produced chromosome damage, also showed the most effective induction of ROS in their respective size fractions.ConclusionsSurface chemistry and size modulate the in vitro intracellular ROS formation and the induction of genotoxic effects by fibrillated celluloses. One cationic (fine E-CNF) and one anionic (coarse C-CNF) CNF showed primary genotoxic effects, possibly partly through ROS generation. However, the conclusions cannot be generalized to all types of CNFs, as the synthesis process and the dispersion method used for testing affect their physico-chemical properties and, hence, their toxic effects.

Synthesis, Characterization, and Antifungal Activity of Pyridine-Based Triple Quaternized Chitosan Derivatives.

In this study, a series of triple quaternized chitosan derivatives, including 6-O-[(2-hydroxy-3-trimethylammonium)propyl]-2-N-(1-pyridylmethyl-2-ylmethyl)-N,N-dimethyl chitosan chloride (7), 6-O-[(2-hydroxy-3-trimethylammonium)propyl]-2-N-(1-pyridylmethyl-3-yl- methyl)-N,N-dimethyl chitosan chloride (8), and 6-O-[(2-hydroxy-3-trimethylammonium)propyl]- 2-N-(1-pyridylmethyl-4-ylmethyl)-N,N-dimethyl chitosan chloride (9) were successfully designed and synthesized via reacting epoxypropyl trimethylammonium chloride with the N-pyridinium double quaternized chitosan derivatives. Detailed structural characterization was carried out using FT-IR and 1H-NMR spectroscopy, and elemental analysis. Besides, the activity of the triple quaternized chitosan derivatives against three common plant pathogenic fungi, Watermelon fusarium, Fusarium oxysporum, and Phomopsis asparagi, was investigated in vitro. The results indicated that the triple quaternized chitosan derivatives had enhanced antifungal activity when compared to double quaternized chitosan derivatives and chitosan, especially at 1.0 mg/mL, which confirmed the theory that the higher density of positive charge contributed to the antifungal activity. Moreover, 8 with an almost 99% inhibitory index showed the better antifungal activity against Watermelon fusarium. Moreover, the cytotoxicity of the products was also evaluated in vitro on 3T3-L1 cells and all the triple quaternized chitosan derivatives exhibited low cytotoxicity. These results suggested that triple quaternized chitosan derivatives may be used as good antifungal biomaterials.

Hydrolysis kinetics of epoxypropyltrimethylammonium chloride in ethanol/water solution system

NaOH-based hydrolysis of epoxypropyltrimethylammonium chloride (ETA) was carried out in a batch reactor using ethanol/water system. The analytic technique, headspace-gas chromatography, was employed in order to follow the time evolution of ETA aqueous solution. Various effects on hydrolysis degree, such as, molar ratio of ethanol/water, NaOH concentration, reaction temperature, and dosage of hydrolysis product (2,3-dihydroxypropyl trimethylammonium chloride) were investigated. And then the kinetic model of the hydrolysis of ETA was developed and the possible mechanism of nucleophilic ring opening reaction was proposed. Furthermore, the model parameters of the process were also determined by data fitting. The results show that ETA hydrolysis follows the pseudo-first order law and kinetic model agrees well with the experimental results. Therefore, based on this kinetic model we could control the hydrolysis degree of ETA during ETA-involved cationic etherification of natural polymer in order to improve the etherification efficiency.

Antibacterial membranes based on chitosan and quaternary ammonium salts modified nanocrystalline cellulose

Etherification of nanocrystalline cellulose (NCC) with three kinds of quaternary ammonium salts epoxypropyltrimethylammonium chloride, N,N‐dimethyl‐N‐dodecyl‐N‐(1,2‐epoxypropyl) ammonium chloride (DMDEPAC), and N,N‐dimethyl‐N‐octadecyl‐N‐(1,2‐epoxypropyl) ammonium chloride (DMOEPAC) was successfully performed via a nucleophilic addition reaction. The synthesized DMDEPAC and DMOEPAC were characterized by nuclear magnetic resonance. The modified NCC particles, NCC epoxypropyltrimethylammonium chloride, NCC‐DMDEPAC, and NCC‐DMOEPAC, were characterized by energy dispersive spectrometer. Nanocomposite films based on chitosan (CS) containing quaternary ammonium salts modified NCC were prepared with nanoparticle loadings of 5.0, 7.5, and 10.0%, respectively. The effect of nanoparticle content on the tensile strength of composite films was studied. The results indicated that the films with 5.0% nanoparticle loading exhibited the biggest increase in tensile strength. Surface morphology, smoothness, and antibacterial properties of composite films containing 5% modified NCC were also studied. CS/NCC‐DMDEPAC‐5.0 and CS/NCC‐DMOEPAC‐5.0 displayed excellent biocidal abilities against both Gram‐positive Staphylococcus aureus (ATCC 6538) and Gram‐negative Escherichia coli O157:H7 (ATCC 43895). The bio‐based nanocomposite films with increased mechanical strength and excellent antibacterial properties show great potential as food packaging materials. Copyright © 2017 John Wiley & Sons, Ltd.

Simultaneous Cationization and Antimicrobial Treatment of Cotton Khadi Fabric with Poly-Hydroxy Methyl Amino Sillicone (PHAMS) and Poly Ethylene Glycol (PEG)

Cotton Khadi fabric is treated with eco-friendly anti- microbial agents like Polyethylene Glycol (PEG -200), Poly-Hydroxyl Amino Methyl Silicone (PHAMS) and Citric Acid (CA) individually and in their blends as compared to treatment with epoxy-propyl-trimethyl-ammonium chloride (EPTAC) in presence of MgCl2 as mild acidic catalyst by low tensioned padding and drying at 100°C for 10 min. followed by curing at 120°C for 4 min. to investigate the effect of such treatment on important textile related properties and microbial resistance and dye-ability with reactive dye. For presence of –OH group, PEG, PHAMS and EPTAC have ability to react with –OH groups of cellulose under acidic catalyst to bound to cellulose macromolecules forming ether linkage and can produce a modified cationized cotton attaching –NR3+ groups of EPTAC and –NHR2+or –NH3+groups of PHAMS. Highest Antimicrobial and salt free dyeing with reactive dye was achieved by combined treatment of PEG and PHAMS (in 3:1 ratio) in presence of 1/5th of magnesium chloride. FTIR, XPS and TGA studies have been carried out to understand the nature of reaction and modification occur to support reaction mechanism discussed. The effectiveness of the antimicrobial properties have been assessed by measuring the loss of tensile strength by soil burial test and also by testing as per AATCC-100 and AATCC-147.

Synthesis of Hydrophobic Cationic Chitosan Flocculant and Its Sludge Dewatering Property

ABSTRACTThe hydrophobic cationic chitosan (HTCC) flocculant was synthesized by reacting chitosan with epoxy propyl trimethyl ammonium chloride (EPTAC) and (2,3-epoxy propyl) dodecyl dimethyl ammonium chloride (EDC), to improve its waste sludge dewaterability. By FTIR and 1H NMR analysis, EPTAC and EDC were confirmed to be grafted onto the molecular chains of chitosan (CTS) successfully. With the increase of EDC content, G′ of HTCC aqueous solution with 1:1.5:1.5 mole ratio of CTS:EPTAC:EDC consistently showed higher values than G″ over the entire frequency range explored, indicating the formation of a physically cross-linked network. The crystallization ability of HTCC decreased compared with pristine CTS. The long alkyl chains on the EDC molecules enhanced the hydrophobicity of HTCC, and better dewaterability of the waste sludge was achieved through the promoted bridging action of HTCC.

Nanocellulose from green algae modulates the in vitro inflammatory response of monocytes/macrophages

The response of monocytes and macrophages to functionalized Cladophora nanocellulose (CC) films was evaluated. Carboxyl-CC and hydroxypropyltrimethylammonium-CC [referred to as anionic-CC (a-CC) and cationic-CC (c-CC), respectively] were synthesized by TEMPO-mediated oxidation and epoxypropyltrimethylammonium chloride condensation of unmodified CC (u-CC). The cell response to u-CC, a-CC and c-CC of untreated and phorbol 12-myristate-13 acetate treated THP-1 cells, i.e. monocytes and macrophages, in the presence and absence of lipopolysaccharide (LPS) was studied. u-CC impairs the viability of THP-1 monocytes and macrophages most probably due to the presence of impurities. In the absence of LPS, the functionalized materials behave as inert materials in terms of the inflammatory response of both monocytes and differentiated macrophages. Under pro-inflammatory stimuli the functionalized CC films suppressed the inflammatory response induced by LPS. The a-CC material with its aggregated, aligned fibre structure caused a more pronounced reduction of TNF-α levels compared to the c-CC film that exhibited non-aggregated, randomly oriented fibres. These results push forward the option of using functionalized CC materials in the biomedical field.

Synthesis and characterization of chitosan quaternary ammonium salt and its application as drug carrier for ribavirin

N-(2-hydroxyl) propyl-3-trimethyl ammonium chitosan chloride (HTCC) is hydro-soluble chitosan (CS) derivative, which can be obtained by the reaction between epoxypropyl trimethyl ammonium chloride (ETA) and CS. The preparation parameters for the synthesis of HTCC were optimized by orthogonal experimental design. ETA was successfully grafted into the free amino group of CS. Grafting of ETA with CS had great effect on the crystal structure of HTCC, which was confirmed by the XRD results. HTCC displayed higher capability to form nanoparticles by crosslinking with negatively charged sodium tripolyphosphate (TPP). Ribavrin- (RIV-) loaded HTCC nanoparticles were positively charged and were spherical in shape with average particle size of 200 nm. More efficient drug encapsulation efficiency and loading capacity were obtained for HTCC in comparison with CS, however, HTCC nanoparticles displayed faster release rate due to its hydro-soluble properties. The results suggest that HTCC is a promising CS derivative for the encapsulation of hydrophilic drugs in obtaining sustained release of drugs.

Preparation and Characterization of High-Substituted Cationic Starches in Aqueous Solutions

In the presence of alkaline catalyst NaOH,the cationic corn starches bearing quaternary amino group with high degree of substitution are prepared by the reaction of the starch with 2, 3- epoxy propyl trimethylammonium chloride (ETA) in aqueous solutions.Under the conditions of molar ratio anhydroglucose/ETA/alkali =1: 4.0: 0.2025, reaction temperature 60°C and reaction time 6h, degree of substitution of the product is 1.0959. Structure of the product is characterized by FTIR and 13C NMR spectroscopy.X-ray diffraction indicates that the crystal structure of the native starch is destroyed and disordered structure of cationic starch is formed.

Modification of SMA Using Epoxypropyl Trimethyl Ammonium Chloride for Carbon Black Dispersing

Poly (styrene-alt-maleic anhydride) (SMA) was modified with epoxypropyl trimethyl ammonium chloride (ETA) through interfacial reaction to prepare an amphoteric dispersant SMG for carbon black dispering. Fourier transforms infrared spectroscopy (FTIR) indicated that the epoxy groups had reacted with anhydride groups. 30.96% anhydride groups in SMA was taken part in the reaction when molar ratio of ETA and SMA was 1.3, mass ratio of p-toluene sulfonic acid and SMA was 14%, and the reaction temperature was 78°C for 6 h. SMG showed an excellent dispersing ability for carbon black when modification degree was higher than 14%, the mass ratio of SMG and carbon black was 7%, and pH value was 9. The change rate of particle size of was only about 3.6% when prepared carbon black dispersion was treated at 60°C for 24 h. The zeta potentials of carbon black dispersion showed amphoteric properties.

N-(2-hydroxyl) propyl-3-trimethyl ammonium chitosan chloride nanoparticle as a novel delivery system for Parathyroid Hormone-Related Protein 1–34

Chitosan (CS) and epoxy propyl trimethyl ammonium chloride (EPTAC) were used to prepare the water-soluble N-(2-hydroxyl) propyl-3-trimethyl ammonium chitosan chloride (HTCC). HTCC and sodium tripolyphosphate (TPP) were mixed to form HTCC nanoparticles based on ionic gelation. Parathyroid Hormone-Related Protein 1–34 (PTHrP1–34) was incorporated into the HTCC nanoparticles. The particle size and morphology of nanoparticles were determined by transmission electron microscopy (TEM). HTCC/PTHrP1–34 nanoparticles were 100–180 nm in size and their encapsulation efficiency and loading capacity were related to HTCC concentration, TPP concentration and initial concentration of PTHrP1–34. Relatively optimum encapsulation efficiency (78.4%) and loading capacity (13.7%) of PTHrP1–34 is achieved, and the in vitro release profile of PTHrP1–34 from nanoparticles has an initial burst, which is followed up by a slow release phase. These studies showed that HTCC/PTHrP1–34 nanoparticles are suitable for the treatment of osteoporosis, because of their slow-continuous-release properties, and the relevant in vivo experiments and clinical trials should be further studied.

Stipa tenacessima L cationized fibers as adsorbent of anionic dyes

AbstractThe extraction of Stipa tenacessima L Alfa fibers was performed using alkaline procedure to remove noncellulosic substances such as pectin, lignin, and hemicellulose. The degree of polymerization of extracted and purified Alfa fibers was determined using viscosimetric method and extracted fibers were used as a cationic ion‐exchange material by treating alkali‐cellulose of Alfa with EpoxyPropylTriMethylAmmonium Chloride (EPTMAC). Evidence of grafting was monitored using IR spectroscopy and thermogravimetry analysis. Two EPTMAC‐Alfa fibers with different %N were prepared and tested as adsorbent of four acid dyes: Acid Blue 25 (AB 25), Acid Yellow 99 (AY 99), Reactive Yellow 23 (RY 23), and Acid Blue 74 (AB 74). The modeling of the adsorption isotherms using Langmuir, Freundlich, and Jossens allowed the determination of isotherm constants leading to characterize the different adsorbent/adsorbate systems prepared. Thermodynamic parameters such as change in free energy (ΔG), the enthalpy (ΔH), and the entropy (ΔS) were also evaluated. Additionally, regeneration of adsorbent solid supports by desorption process in fixed bed column was reported. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010

Cationic surface functionalization of cellulose nanocrystals

The surface of cellulose nanocrystals, prepared by sulfuric acid hydrolysis of cotton, was rendered cationic through a reaction with epoxypropyltrimethylammonium chloride. The resultant nanocrystal suspensions were characterized by ζ-potential, conductometric titration and polarized light microscopy. Atomic force microscopy (AFM) showed no change in the size or shape of the nanocrystals, but the functionalization process reversed the surface charge and led to a reduction of the total surface charge density. These modifications led to stable aqueous suspensions of nanocrystalline cellulose with unexpected gelling and rheological properties. Shear birefringence was observed, but no liquid crystalline chiral nematic phase separation was detected.

Preparation and characterization of sugarcane bagasse hemicellulosic derivatives containing quaternary ammonium groups in various media

AbstractTo increase the solubility and produce cationic or ampholytic polymers as beater additives in papermaking from native hemicelluloses, quaternization of hemicelluloses were performed by reacting hemicelluloses with 3-chloro-2- hydroxypropyltrimethylammonium chloride (CHMAC) and preferably with 2,3- epoxypropyltrimethylammonium chloride (ETA) in aqueous sodium hydroxide, homogenously in dimethyl sulfoxide (DMSO), and completely heterogeneously in ethanol/water, respectively. The extent of modification was measured by degree of substitution (DS), and its value of up to 0.55 can be controlled by adjusting the molar ratio of reagent to hydroxyl functionality in hemicelluloses and the concentration of sodium hydroxide. The characterization of hemicellulosic derivatives was performed by elemental analysis, GPC, FT-IR and 13C NMR spectroscopy as well as thermal analysis. It was found that hemicellulosic polymer was significantly degraded in aqueous sodium hydroxide solution compared with in dimethyl sulfoxide and in ethanol/water systems under the conditions given. The thermal stability of modified hemicelluloses decreased after chemical modification, corresponding to the decreasing Mw of hemicelluloses derivatives.

Antibacterial activity of quaternary ammonium salt grafted cotton

Cotton having good antibacterial activity can be obtained without the need for a binding chemical as a cross linker or the need for chemically pre-treated antibacterial agent. The procedure of synthesis consists in grafting an alkali-cellulose fibre by a quaternary ammonium salt: Epoxy propyltrimethylammonium chloride (EPTMAC). The characterization of grafted cotton (EPTMAC-Cotton) has been targeted on the nitrogen and the methyl group in the ammonium graft structure, by using some analytical techniques, such as infrared, NMR spectroscopy, and volumetric measurement. The antibacterial activity of EPTMAC-Cotton has been studied using four kinds of bacterial stains (Escherichia coli 25922, Pseudomonas aeruginosa 27853, Staphylococcus aureus 259223 and Salmonella LT2DT104 typhimirium). An optimization of conditions of culture medium has been carried out for the bacterial strain for which the modified cotton presents the best antibacterial activity. This optimization is achieved while varying the most important parameters influencing the bacterial growth. We have chosen the pH and the sodium chloride concentration as variable parameters, and we have applied an experiment plant, in order to consider all possible combinations of experiments, and therefore, to estimate the effect of each factor, as well as the effect of their interaction. It has been noticed that a quaternary ammonium salt (EPTMAC) is an efficient antibacterial agent, especially against salmonella in alkaline medium slightly concentrated in salt, and its action depends, in some manner, on the whitening procedure of cotton.

Cationized nylon as adsorbent for anionic residual dyes

AbstractFor use as an ion exchanger, a cationized nylon (EPTMAC–nylon) was prepared by reacting nylon‐6,6 with epoxy propyl trimethyl ammonium chloride (EPTMAC), using anhydrous tin chloride (SnCl2) as catalyst in a nonaqueous medium. Evidence of grafting was provided by atomic force microscopy and the exchange capacity of EPTMAC–nylon was evaluated by potentiometric titration. The adsorption of four dyes (Acid Blue 25, Acid Yellow 99, Reactive Yellow 23, and Acid Blue 74) from aqueous solutions using a batch process was studied according to the adsorption capacity of the cationized support. The effect of experimental parameters such as dye concentration and adsorption temperature were analyzed. The adsorption isotherms were determined at different temperatures and modeled using Langmuir, Freundlich, and Jossens equations. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 91: 2513–2522, 2004