Novel macroporous amphoteric gels: Preparation and characterization

Kudaibergenov, Sarkyt E.; Adilov, Zh.; Berillo, Dmitriy; Tatykhanova, Gulnur S.; Садакбаева, Ж.К.; Абдуллин, Х.А.; Galaev, Igor Yu.

doi:10.3144/expresspolymlett.2012.38

Cited by 23 publications

(16 citation statements)

References 25 publications

(27 reference statements)

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“…Thus, polyelectrolytes are sometimes called polysalts ( Figure 12). However, theoretical approaches [75][76][77] to describing the statistical properties of these charged macromolecules differ profoundly from those of both their electrically neutral and synthetic counterparts [78], while technological and industrial fields exploit their unique properties for a wide range of applications. As illustrated in Figure 12, PSS is a 'strong' polyelectrolyte (fully charged in solution), whereas PAA is a 'weak' polyelectrolyte (partially charged).…”

Section: Polymeric Ionic Liquids (Pils)mentioning

confidence: 99%

Spectroscopic Characterization of Multilayered Functional Protective Polymers via Surface Modification with Organic Polymers against Highly Toxic Chemicals

Ndibewu¹,

Ngobeni²,

Lefakane³

et al. 2016

Recent Advances in Biopolymers

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Recent advances in biopolymers, including functional biomaterials for the manufacture of personal protective garments (PPGs) or equipment (PPE) have dramatically improved their efficiency and performance. Good and acceptable permeation characteristics, mechanical strength and durability are common attributes of these materials simultaneously without compromise for their cost-effectiveness and manufacturability. The comprehensive characterization of these materials and specimens' three-dimensionality with the endeavor to obtain the highest resistance to highly toxic agents such as nuclear, chemical and biological warfare agents is the must fulfilling aim in today's global interest in continuous development in this area. Because energy absorption component seems to be important in considering quality the requirements related to the application of most protective materials (e.g. clothing), spectroscopy would seem to be the cornerstone to be considered for most analytical purposes to supplement the qualitative and quantitative assessment of polymeric materials. The major techniques worth mentioning include: scanning electron microscopy coupled to Xray dispersive spectroscopy (SEM/EDS), atomic force microscopy (AFM), scattering-type near-field optical microscopy, scanning tunneling microscopy (STM), attenuated total reflectance Fourier transform spectroscopy (ATR-FT-IR), infrared spectroscopic ellipsometry, nano-FTIR absorption spectroscopy, near-field optical microscopy, and infrared vibrational nano-spectrosocopy. This chapter will discuss the importance of a particularly important natural polymer (cellulose) containing acetyl groups to form modifiable biopolymers (e.g. cellulose acetate polymers), doped to yield multi-layered functional protective materials (MFPMs) or composites (MFPCs). The ultimate aim seeks to provide critical insights into understanding the enhancement of their permeation characteristics against exposure to toxic industrial chemicals, including chlorine which is currently being used as a chemical warfare agent of choice in the Syrian conflict. MFPMs or MFPCs are a group of materials made from a combination of fiber or polymers together with varying amounts of additives possessing tailored physical and mechanical properties. Many of these materials should not only be durable but also must provide cost-competi

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Section: Polymeric Ionic Liquids (Pils)mentioning

confidence: 99%

Spectroscopic Characterization of Multilayered Functional Protective Polymers via Surface Modification with Organic Polymers against Highly Toxic Chemicals

Ndibewu¹,

Ngobeni²,

Lefakane³

et al. 2016

Recent Advances in Biopolymers

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“…In spite of advances in studying of nonionic, anionic and cationic nanogel, microgel, and macrogel to our knowledge there is very limited information on macroporous amphoteric gels themselves and their complexation with various low‐ and high‐molecular weight compounds.…”

Section: Introductionmentioning

confidence: 99%

Complexation of macroporous amphoteric cryogels based on N,N‐dimethylaminoethyl methacrylate and methacrylic acid with dyes, surfactant, and protein

Kudaibergenov

Tatykhanova

Klivenko

2016

J of Applied Polymer Sci

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Macroporous amphoteric cryogels based on N,N-dimethylaminoethylmethacrylate and methacrylic acid p(DMAEM-co-MAA) crosslinked by N,N 0 -methylenebisacrylamide (MBAA) were synthesized by radical copolymerization of monomer mixtures in cryoconditions. The structure and morphology of cryogels were evaluated by FTIR and SEM. Cryogels exhibited interconnected porous structure with pore size ranging from 40 to 80 mm, which depended on their crosslinking degree. The value of the isoelectric point (IEP) of equimolar amphoteric cryogel determined from the water flux was equal to 4.4, while the IEP of cryogel with the excess of DMAEM units was equal to 7.1. The mechanical strength of equimolar amphoteric cryogels increases with increasing amount of crosslinking agent. The complexation ability of amphoteric cryogels with respect to surfactant, dyes, and protein was demonstrated. The adsorption isotherms with respect to anionic surfactant-sodium dodecylbenzene sulfonate (SDBS) and protein-lysozyme correspond to Langmuir equation, while adsorption isotherms of anionic and cationic dyes-methylene blue (MB) and methyl orange (MO) are well described by Freundlich equation. It was found that the binding ability of p(DMAEM-co-MAA) with respect to various low-and high-molecular weight compounds changes in the following order: SDBS > lysozyme MO > MB. The preferential adsorption of MB from the mixture of protein and MB was shown. The quantitative release of protein, surfactant and dye molecules from the matrix of cryogels takes place at the IEP of cryogel.

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“…Cryogel catalysts could be promising due to the inherent features of these materials: macroporous structures, adjustable hydrophilicity and hydrophobicity, and flexible choice and combination of catalytic groups. Supporting of noble and transition metal ions in bulk of amphoteric macrogels followed by reduction to zero‐valent state will open new perspectives for development of effective catalytic systems for decomposition, isomerization, hydrogenation, and oxidation of various organic substrates . In this context design of monolithic support with microporous structure that can provide both nanoparticle loading and liquid flux is challenging task.…”

Section: Introductionmentioning

confidence: 99%

“…Supporting of noble and transition metal ions in bulk of amphoteric macrogels followed by reduction to zero-valent state will open new perspectives for development of effective catalytic systems for decomposition, isomerization, hydrogenation, and oxidation of various organic substrates. [7][8][9] In this context design of monolithic support with microporous structure that can provide both nanoparticle loading and liquid flux is challenging task. A considerable effort of researchers is devoted to construct the catalytic system that is highly active, selective, stable, easy to handle, reusable and simple to separate the product from the reaction medium.…”

Section: Introductionmentioning

confidence: 99%

“…The idea of application of amphoteric macroporous cryogels with immobilized nanoparticles of metals as flowing reactors in catalysis was outlined for the first time in our previous publications. [7][8][9] In the present communication we report for the first time the preparation of gold nanoparticles (AuNPs) within macroporous amphoteric cryogels based on N,N-dimethylaminoethylmethacrylate and methacrylic acid p(DMAEM-co-MAA) and evaluation of the catalytic activity of AuNPs immobilized within cryogel matrix in reduction of 4-nitrophenol.…”

Section: Introductionmentioning

confidence: 99%

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Flow–Through Catalytic Rector Based on Macroporous Amphoteric Cryogels and Gold Nanoparticles

Tatykhanova

Klivenko

Kudaibergenova

et al. 2016

Macromolecular Symposia

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Summary Macroporous amphoteric cryogel based on N,N‐dimethylaminoethylmethacrylate and methacrylic acid p(DMAEM‐co‐MAA) was used for immobilization of gold nanoparticles (AuNPs). The structure of AuNPs immobilized within macroporous amphoteric cryogel is mostly represented by spherical and triangular species. Amphoteric cryogel with immobilized AuNPs was tested as flow‐through catalytic reactor in reduction of 4‐nitrophenol by NaBH4.

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Novel macroporous amphoteric gels: Preparation and characterization

Cited by 23 publications

References 25 publications

Spectroscopic Characterization of Multilayered Functional Protective Polymers via Surface Modification with Organic Polymers against Highly Toxic Chemicals

Spectroscopic Characterization of Multilayered Functional Protective Polymers via Surface Modification with Organic Polymers against Highly Toxic Chemicals

Complexation of macroporous amphoteric cryogels based on N,N‐dimethylaminoethyl methacrylate and methacrylic acid with dyes, surfactant, and protein

Flow–Through Catalytic Rector Based on Macroporous Amphoteric Cryogels and Gold Nanoparticles

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