Influence of charge density and ionic strength on diallyldimethylammonium chloride (DADMAC)-based polyelectrolyte multilayer membrane formation

Scheepers, Daniëlle; Chatillon, Benjamin; Borneman, Zandrie; Nijmeijer, Kitty

doi:10.1016/j.memsci.2020.118619

Cited by 42 publications

(43 citation statements)

References 45 publications

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“…Another strength of the LbL method is the wide variety of possibilities to tune the properties of these membranes by varying the PE layer chemistry and/or coating parameters. Among others, these parameters are the type of PEs, their charge densities, the number of BLs, the terminating layer, and the salt concentration of the coating solution 8,18,23–30 …”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the salt concentration (ionic strength) of the PE coating solution impacts the formation of the PE layers tremendously 8,18,23,29,30 . Normally, the PC charges are ionically linked to the PA charges, called intrinsic charge compensation.…”

Section: Introductionmentioning

confidence: 99%

“…One of the most frequently used PE couples for the partial desalination of water streams is the combination of polydiallyl dimethylammonium chloride (PDADMAC) and poly(sodium 4‐styrene sulfonate) (PSS) 8,33–36 . The terminating layer of the membrane (PDADMAC or PSS) affects the membrane performance, in literature referred to as the odd‐even effect 8,23,37,38 . This odd‐even effect is caused by the higher swelling degree of PDADMAC compared to PSS, which can be up to a four‐fold more at high ionic strengths 38 .…”

Section: Introductionmentioning

confidence: 99%

“…To do so, we use polyacrylamide‐co‐diallyl dimethylammonium chloride (P(AM‐co‐DADMAC)), a copolymer of PDADMAC, as PC 23 . Where PDADMAC has a charge density of 100%, its copolymer P(AM‐co‐DADMAC) has a charge density of only 32% (percentage of charged monomer units to the total amount of monomer units present in the PE).…”

Section: Introductionmentioning

confidence: 99%

“…Where PDADMAC has a charge density of 100%, its copolymer P(AM‐co‐DADMAC) has a charge density of only 32% (percentage of charged monomer units to the total amount of monomer units present in the PE). It is hypothesized that this will decreases the amount of available positive charges at the membrane surface and with that, the permeation and retention behavior can be tuned 23 . The use of an asymmetric layer build‐up is necessary because membranes coated with solely P(AM‐co‐DADMAC)/PSS layers are limited in their layer build‐up.…”

Section: Introductionmentioning

confidence: 99%

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Asymmetric layer‐by‐layer polyelectrolyte nanofiltration membranes with tunable retention

Scheepers

Chatillon

Nijmeijer

et al. 2021

Journal of Polymer Science

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Nanofiltration (NF) membrane processes are attractive to remove multivalent ions. As ion retention in NF membranes is determined by both size and charge exclusion, negatively charged membranes are required to reject negatively charged ions. Layer‐by‐layer assembly of alternating polycation (PC) and polyanion layers on top of a support is a versatile method to produce membranes. Especially the polyelectrolyte (PE) couple polydiallyldimethylammoniumchloride and poly(sodium‐4‐styrenesulfonate) (PDADMAC/PSS) is extensively investigated. This PE couple cannot form highly negatively charged membrane surfaces, due to interdiffusion and charge overcompensation of PDADMAC into the PSS layers, which limits the operational window to tailor membrane properties. We propose the use of asymmetric layer formation and show how combining two charge densities of one PC can produce negatively charged NF membranes. Starting from hollow fiber ultrafiltration supports coated with base layers of PDADMAC/PSS, they are coated with PDADMAC/PSS or poly(acrylamide‐co‐diallyldimethylammoniumchloride), P(AM‐co‐DADMAC)/PSS layers. P(AM‐co‐DADMAC) has a charge density of only 32% compared to 100% for PDADMAC. The particular novel membranes coated with P(AM‐co‐DADMAC) have a highly negatively charged surface and high permeabilities (7–19 L/[m2hbar]), with high retentions for Na2SO4 of up to 95%. These values position the developed membranes in the top range compared to commercial and other layer‐by‐layer membranes.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Asymmetric layer‐by‐layer polyelectrolyte nanofiltration membranes with tunable retention

Scheepers

Chatillon

Nijmeijer

et al. 2021

Journal of Polymer Science

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Mussel‐inspired Self‐assembly into Polymer Coatings of Different Molecular Weight Electrolytes for Enhanced Self‐healing and Corrosion Properties

Zhang

Sheng

et al. 2023

Chemistry An Asian Journal

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Self‐healing coatings offer tremendous application prospects in the field of preventing metal corrosion because of their superior functionality. The coordination of barrier performance and self‐healing ability, however, continues to be difficult. Herein, a polymer coating based on polyethyleneimine (PEI) and polyacrylic acid (PAA) with self‐repairing and barrier ability was designed. Introducing the catechol group into the anti‐corrosion coating increases the adhesion and self‐healing efficiency of the coating, providing a guarantee for the long‐term stable bonding between the anti‐corrosion coating and the metal substrate. Small molecular weight PAA polymers are added to polymer coatings to increase their self‐healing capabilities and corrosion resistance. Because layer‐by‐layer assembly creates reversible hydrogen bonds and electrostatic bonds that help the coating repair itself when it is damaged, and because the traction of small molecular weight polyacrylic acid speeds up this process. When polyacrylic acid (PAA) with a molecular weight of 2000 was present in the coating at a concentration of 1.5 mg/mL. The PEI‐C/PAA45W‐PAA2000 coating has the fastest self‐healing, and the corrosion resistance efficiency (Pe) was as high as 90.1%. The polarization resistance (Rp) was maintained at 7.67×104 Ω∙cm2 after immersion for more than 240 h. It was better than other samples in this work.

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Potentiometric back titration as a robust and simple method for specific surface area estimation of lignocellulosic fibers

et al. 2021

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The specific surface area (SSA) of cellulosic or lignocellulosic fibers is seldom reported in the recent literature on papermaking, despite its close relation with the degree of refining and other key pulp properties. Amidst outdated assays (Pulmac permeability test) and methods that, while accurate, are of doubtful usefulness for papermaking purposes (N2 adsorption–desorption), we suggest a methodology based on the cationic demand. A commonly used cationic polyelectrolyte, poly(diallyldimethylammonium chloride) (PDADMAC), became adsorbed onto thermomechanical pulp samples. Then, a potentiometric back titration with an anionic polyelectrolyte measured the cationic demand, expressed as microequivalents of PDADMAC per gram of pulp. Multiplying this value by the surface area of a microequivalent of polymer, considering rod-like conformation in the case of minimum ionic strength, yielded the SSA of the lignocellulosic pulp. Our system assumes that the quaternary ammonium groups were anchored through electrostatic and ion–dipole interactions. Measuring the carboxyl content allowed for discriminating between both kinds of forces. Finally, the model could be validated by plotting the estimated SSA values against the Schopper-Riegler degree, attaining high correlation coefficients (R2 ~ 0.98). Owing to the high molecular weight of the polyelectrolyte of choice (107 kDa), and more particularly in the case of fine-free pulps, SSA values estimated from the cationic demand were consistently lower than those from dye (Congo red) sorption. Instead of being a drawback, the limited diffusion of PDADMAC through fibers can enable papermakers to attain a more helpful quantification of the available surfaces in operations with low residence times.

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Influence of charge density and ionic strength on diallyldimethylammonium chloride (DADMAC)-based polyelectrolyte multilayer membrane formation

Cited by 42 publications

References 45 publications

Asymmetric layer‐by‐layer polyelectrolyte nanofiltration membranes with tunable retention

Asymmetric layer‐by‐layer polyelectrolyte nanofiltration membranes with tunable retention

Mussel‐inspired Self‐assembly into Polymer Coatings of Different Molecular Weight Electrolytes for Enhanced Self‐healing and Corrosion Properties

Potentiometric back titration as a robust and simple method for specific surface area estimation of lignocellulosic fibers

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