High strength poly(acrylamide)-clay hydrogels

Helvacıoğlu, Ekmel; Aydin, M. Volkan; Nugay, Turgut; Nugay, Nihan; Uluocak, Bilge Gedik; Şen, Sinan

doi:10.1007/s10965-011-9647-x

Cited by 44 publications

(25 citation statements)

References 26 publications

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“…Thus, the synergistic interactions become more complicated because of the presence of CNPs in the polymeric networks, which play a key role in the mechanical behavior of the nanocomposite hydrogels. 98 At present, the inherent reasons for the exceptional toughness of clay nanocomposite hydrogels remain elusive and require further investigation. In addition, clay minerals can improve the hydrophilicity and flexibility of networks, resulting in increases in tensile strength and modulus.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Recent advances in clay mineral-containing nanocomposite hydrogels

et al. 2015

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Clay mineral-containing nanocomposite hydrogels have been proven to have exceptional composition, properties, and applications, and consequently have attracted a significant amount of research effort over the past few years. The objective of this paper is to summarize and evaluate scientific advances in clay mineral-containing nanocomposite hydrogels in terms of their specific preparation, formation mechanisms, properties, and applications, and to identify the prevailing challenges and future directions in the field. The state-of-the-art of existing technologies and insights into the exfoliation of layered clay minerals, in particular montmorillonite and LAPONITE s , are discussed first. The formation and structural characteristics of polymer/clay nanocomposite hydrogels made from in situ free radical polymerization, supramolecular assembly, and freezing-thawing cycles are then examined. Studies indicate that additional hydrogen bonding, electrostatic interactions, coordination bonds, hydrophobic interaction, and even covalent bonds could occur between the clay mineral nanoplatelets and polymer chains, thereby leading to the formation of unique three-dimensional networks. Accordingly, the hydrogels exhibit exceptional optical and mechanical properties, swelling-deswelling behavior, and stimuli-responsiveness, reflecting the remarkable effects of clay minerals. With the pivotal roles of clay minerals in clay mineral-containing nanocomposite hydrogels, the nanocomposite hydrogels possess great potential as superabsorbents, drug vehicles, tissue scaffolds, wound dressing, and biosensors. Future studies should lay emphasis on the formation mechanisms with in-depth insights into interfacial interactions, the tactical functionalization of clay minerals and polymers for desired properties, and expanding of their applications.

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Section: Mechanical Propertiesmentioning

confidence: 99%

Recent advances in clay mineral-containing nanocomposite hydrogels

et al. 2015

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“…Recently, MMT was used to fabricate poly(vinyl alcohol)/clay hydrogel and aerogel composites by gamma irradiation without chemical additives . However, in these previous studies MMT was just used as fillers by weak physical interaction with macromolecular chains and had a little influence on the improvement of the mechanical properties for composite hydrogel …”

Section: Introductionmentioning

confidence: 99%

Nanocomposite hydrogel consisting of Na‐montmorillonite with enhanced mechanical properties

Xiang

et al. 2015

J Polym Sci B Polym Phys

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A new kind of nanocomposite (NC) hydrogel with Na‐montmorillonite (MMT) is presented in this article. The NC hydrogels were synthesized by free radical copolymerization of acrylamide and (3‐acrylamidopropyl) trimethylammonium chloride (ATC) in the presence of MMT and N,N′‐methylene‐bis‐acrylamide used as chemical cross‐linker. Due to the cation‐exchange reaction between MMT and ATC (cationic monomer) during the synthesis of NC hydrogels, MMT platelets were considered chemical “plane” cross‐linkers, different from “point” cross‐linkers. With increasing amount of MMT, the crosslinking degree enhanced, causing a decrease of the swelling degree at equilibrium. Investigations of mechanical properties indicated that NC hydrogels exhibited enhanced strength and toughness, which resulted from chemical interaction between exfoliated MMT platelets and polymer chains in hydrogels. Dynamic shear measurements showed that both storage modulus and loss modulus increased with increasing MMT content. The idea described here provided a new route to prepare hydrogels with high mechanical properties by using alternative natural Na‐MMT. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2015, 53, 1020–1026

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“…Superabsorbent composites are one group of such materials, in which the polymer matrix consists of hydrophilic polymers, mainly of poly(acrylic acid) (PAA) [17] and its salts [18], poly(acrylamide) [19,20], 2-methylpropane sulfonic acid (AMPS), and their copolymers [21,22]. These hybrid materials, due to their functional groups, are efficient adsorbents of heavy metals cations (e.g., Pb 2?…”

Section: Introductionmentioning

confidence: 99%

Effect of Fe3+ ions present in the structure of poly(acrylic acid)/montmorillonite composites on their thermal decomposition

Natkański

Kuśtrowski

Białas

et al. 2013

J Therm Anal Calorim

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Poly(acrylic acid)/montmorillonite (MMT) composites with various polymer contents were synthesized by in situ polymerization technique. The structure of obtained materials was characterized by powder X-ray diffraction and infrared spectroscopy (FTIR). It was found that only a limited amount of hydrogel could be introduced between the clay layers. The remaining part of polymer was deposited on the external surface of clay particles. The introduction of the polymer modifier significantly increased the adsorption capacity of MMT in the elimination of Fe 3?ions from aqueous solution. The thermal behavior of the samples before and after the Fe 3? adsorption was examined by thermogravimetry and differential thermal analysis. Moreover, the composition of gaseous products evolved during decomposition was determined by FTIR. The materials after Fe 3? adsorption exhibited different thermal stability in oxidizing atmosphere than the fresh samples. Fe 3? cations, forming FeO x species during thermal treatment, appeared to be effective catalysts of polymer oxidation.

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High strength poly(acrylamide)-clay hydrogels

Cited by 44 publications

References 26 publications

Recent advances in clay mineral-containing nanocomposite hydrogels

Recent advances in clay mineral-containing nanocomposite hydrogels

Nanocomposite hydrogel consisting of Na‐montmorillonite with enhanced mechanical properties

Effect of Fe3+ ions present in the structure of poly(acrylic acid)/montmorillonite composites on their thermal decomposition

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