Extruded Superparamagnetic Saloplastic Polyelectrolyte Nanocomposites

Fu, Jingcheng; Wang, Qifeng; Schlenoff, Joseph B.

doi:10.1021/am5074694

Cited by 22 publications

(30 citation statements)

References 48 publications

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“…Compacting PECs with added solids by ultracentrifugation is not ideal, since the high centrifugal fields will concentrate denser additives towards the bottom of the sample. Super‐paramagnetic iron oxide nanoparticles (IONs), 12 nm in diameter, were co‐precipitated with PDADMA/PSS PECs and extruded into fibers . The bulk exPEC retained the magnetic properties of the ION additive, which permitted remote heating of the exPEC by radiofrequency fields.…”

Section: (Nano)compositesmentioning

confidence: 99%

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Saloplastics: Processing Compact Polyelectrolyte Complexes

2015

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Polyelectrolyte complexes (PECs) are prepared by mixing solutions of oppositely charged polyelectrolytes. These diffuse, amorphous precipitates may be compacted into dense materials, CoPECs, by ultracentrifugation (ucPECs) or extrusion (exPECs). The presence of salt water is essential in plasticizing PECs to allow them to be reformed and fused. When hydrated, CoPECs are versatile, rugged, biocompatible, elastic materials with applications including bioinspired materials, supports for enzymes and (nano)composites. In this review, various methods for making CoPECs are described, as well as fundamental responses of CoPEC mechanical properties to salt concentration. Possible applications as synthetic cartilage, enzymatically active biocomposites, self-healing materials, and magnetic nanocomposites are presented.

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Section: (Nano)compositesmentioning

confidence: 99%

“…0.5 wt% (—), 2.1% (– –) and 4.5% ION (–·), at 300 K. B) Temperature versus time for ION–PEC fibers containing: a) 0.0%; b) 0.5%; c) 2.1%; and d) 4.5 wt% ION exposed to a 1 kW radio‐frequency (rf) field. Reproduced with permission . Copyright 2014, American Chemical Society.…”

Section: (Nano)compositesmentioning

confidence: 99%

Saloplastics: Processing Compact Polyelectrolyte Complexes

2015

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“…Similar results were reported for COPECs based on PSS/PDADMAC, suggesting that such materials are suitable for performing extrusion processes, which typically require temperatures lower than 300°C. 2,14 Interestingly, PMAA/PAH COPECs outperformed the thermal stability of PAH up to 370°C. Such stabilization of the polymer blend was previously reported for PAA/PAH multilayer films Thermogravimetric analysis of the corresponding dry COPECs (black line) and its components PAH (red line) and PMAA (blue line) from room temperature to 500°C under argon at a rate of 10°C /min.…”

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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“…Additionally, incorporation of PECs with other kinds of materials, such as nanoparticles, is also demonstrated indicating it is possible to have materials with even more advanced functions. 221 − 224 Moreover, PECs are plasticized and then processed after being exposed to saline aqueous solutions without using toxic organic solvents suggesting saloplastic materials can be prepared in a sustainable manner. The introduction of saloplastics to the literature signaled that PEC films can be obtained in many ways and these films can have numerous functions, which will be particularly useful for membrane applications.…”

Section: Polyelectrolytes and Polyelectrolyte Complexes As Free-standing Membranesmentioning

confidence: 99%

Polyelectrolytes as Building Blocks for Next-Generation Membranes with Advanced Functionalities

Durmaz

Şahin

Virga

et al. 2021

ACS Appl. Polym. Mater.

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The global society is in a transition, where dealing with climate change and water scarcity are important challenges. More efficient separations of chemical species are essential to reduce energy consumption and to provide more reliable access to clean water. Here, membranes with advanced functionalities that go beyond standard separation properties can play a key role. This includes relevant functionalities, such as stimuli-responsiveness, fouling control, stability, specific selectivity, sustainability, and antimicrobial activity. Polyelectrolytes and their complexes are an especially promising system to provide advanced membrane functionalities. Here, we have reviewed recent work where advanced membrane properties stem directly from the material properties provided by polyelectrolytes. This work highlights the versatility of polyelectrolyte-based membrane modifications, where polyelectrolytes are not only applied as single layers, including brushes, but also as more complex polyelectrolyte multilayers on both porous membrane supports and dense membranes. Moreover, free-standing membranes can also be produced completely from aqueous polyelectrolyte solutions allowing much more sustainable approaches to membrane fabrication. The Review demonstrates the promise that polyelectrolytes and their complexes hold for next-generation membranes with advanced properties, while it also provides a clear outlook on the future of this promising field.

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Extruded Superparamagnetic Saloplastic Polyelectrolyte Nanocomposites

Cited by 22 publications

References 48 publications

Saloplastics: Processing Compact Polyelectrolyte Complexes

Saloplastics: Processing Compact Polyelectrolyte Complexes

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

Polyelectrolytes as Building Blocks for Next-Generation Membranes with Advanced Functionalities

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