Engineering novel polyelectrolyte complex membranes with improved mechanical properties and separation performance

Wang, Xue-San; Ji, Yan-Li; Zheng, Pei-Yao; An, Quan‐Fu; Zhao, Qiang; Lee, Kueir‐Rarn; Qian, Jinwen; Gao, Congjie

doi:10.1039/c4ta06477a

Cited by 36 publications

(14 citation statements)

References 53 publications

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“…All free-standing PEC films exhibited a brittle fracture toward the middle of the films with a correspondingly low strain value of ~2%, and previous reports also suggested that PECs have a low strain at break of ~5%. 43 In general, our data are consistent with other reports that demonstrate increased mechanical properties after annealing, 44,66,67 and we attribute the increase in ultimate tensile stress to an increase in the concentration of ionic bonds in the material as well as a removal of stress-concentrating defects associated with the submicron clusters associated with the opacity of the untreated material.…”

Section: Resultssupporting

confidence: 92%

Bacteria-Resistant, Transparent, Free-Standing Films Prepared from Complex Coacervates

Kurtz

Sui

Hao

et al. 2019

ACS Appl. Bio Mater.

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We report the fabrication, properties, and bacteria-resistance of polyelectrolyte complex (PEC) coatings and free-standing films. Poly(4-styrenesulfonic acid), poly(diallyldimethyl-ammonium chloride), and salt were spin-coated into PEC films. After thermal annealing in a humid environment, highly transparent, mechanically strong, and chemically robust films were formed. Notably, we demonstrate that PEC coatings significantly reduce the attachment of Escherichia coli K12 without killing the micro-organisms. We suggest that forming bacteria-resistant surface coatings from commercially available polymers holds the potential for use across a wide range of applications including high-touch surfaces in medical settings.

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Section: Resultssupporting

confidence: 92%

Bacteria-Resistant, Transparent, Free-Standing Films Prepared from Complex Coacervates

Kurtz

Sui

Hao

et al. 2019

ACS Appl. Bio Mater.

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“…For instance, the superior pervaporation performances of membranes based on dextran sulfate/ chitosan sulfated saloplastics were recently attributed to their compact yet hydrated nature. 37,38 The formation of pores within polyelectrolyte materials can arise from several factors: an increase of the local osmotic pressure in the presence of a higher ionic strength, 28 a decrease in the material's cross-link density, or a mismatch between the number of positive and negative charges born by the polyelectrolyte chains. 39,40 In this work, the doping rate of COO − groups with Na + ions ( Figure S-8) did not correlate with the emergence of pores within the PMAA/PAH saloplastic, indicating that osmotic pressure was not a prominent factor.…”

Section: Resultsmentioning

confidence: 99%

pH-Responsive Saloplastics Based on Weak Polyelectrolytes: From Molecular Processes to Material Scale Properties

et al. 2018

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Compact polyelectrolyte complexes (COPECs), also named saloplastics, represent a new class of material with high fracture strain and self-healing properties. Here, COPECs based on poly-(methacrylic acid) (PMAA) and poly(allylamine hydrochloride) (PAH) were prepared by centrifugation at pH 7. The influence of postassembly pH changes was monitored chemically by ATR-FTIR, ICP, DSC, and TGA, morphologically by SEM, and mechanically by strain to break measurements. Postassembly pH stimuli misbalanced the charge ratio in COPECs, impacting their concentration in counterions, cross-link density, and polymer chain mobility. At the material level, changes were observed in the porosity, composition, water content, and mechanical properties of COPECs. The cross-link density was a prominent factor governing the saloplastic's composition and water content. However, the porosity and mechanical properties were driven by several factors including salt-induced plasticization and conformational changes of polyelectrolytes. This work illustrates how multiple-scale consequences arise from a single change in the environment of COPECs, providing insights for future design of stimuli-responsive materials.

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“…These methods can reduce the thickness of the effective PEC layer, while significantly improving the mechanical strength of the membrane. The formation of multilayer membranes of this type has been described in the literature [5,6]; however, a significantly large number of layer-by-layer depositions of anionic/cationic polyelectrolytes are often required to achieve high membrane selectivity. This is especially the case when the substrate membrane is microporous [7], as the presence of open pores on the membrane surface creates membrane defects that give rise to non-selectivity.…”

Section: Introductionmentioning

confidence: 99%

Two-Ply Composite Membranes with Separation Layers from Chitosan and Sulfoethylcellulose on a Microporous Support Based on Poly(diphenylsulfone-N-phenylphthalimide)

et al. 2017

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Two-ply composite membranes with separation layers from chitosan and sulfoethylcellulose were developed on a microporous support based on poly(diphenylsulfone-N-phenylphthalimide) and investigated by use of X-ray diffraction and scanning electron microscopy methods. The pervaporation properties of the membranes were studied for the separation of aqueous alcohol (ethanol, propan-2-ol) mixtures of different compositions. When the mixtures to be separated consist of less than 15 wt % water in propan-2-ol, the membranes composed of polyelectrolytes with the same molar fraction of ionogenic groups (-NH3+ for chitosan and -SO3− for sulfoethylcellulose) show high permselectivity (the water content in the permeate was 100%). Factors affecting the structure of a non-porous layer of the polyelectrolyte complex formed on the substrate surface and the contribution of that complex to changes in the transport properties of membranes are discussed. The results indicate significant prospects for the use of chitosan and sulfoethylcellulose for the formation of highly selective pervaporation membranes.

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Engineering novel polyelectrolyte complex membranes with improved mechanical properties and separation performance

Abstract: Polyelectrolyte complexes (PECs) commonly suffer from poor processability owing to their ionic crosslinking nature, a problem which spurs increasing interest in processable PECs.

Cited by 36 publications

References 53 publications

Bacteria-Resistant, Transparent, Free-Standing Films Prepared from Complex Coacervates

Bacteria-Resistant, Transparent, Free-Standing Films Prepared from Complex Coacervates

pH-Responsive Saloplastics Based on Weak Polyelectrolytes: From Molecular Processes to Material Scale Properties

Two-Ply Composite Membranes with Separation Layers from Chitosan and Sulfoethylcellulose on a Microporous Support Based on Poly(diphenylsulfone-N-phenylphthalimide)

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