Preparation and properties of linear low-density polyethylene-g-poly (acrylic acid)/organo-montmorillonite superabsorbent hydrogel composites

Irani, Maryam; Ismail, Hanafi; Ahmad, Zulkifli

doi:10.1016/j.polymertesting.2013.01.001

Cited by 78 publications

(37 citation statements)

References 43 publications

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“…For example, a small amount of BP was used as an initiator in the preparation of nanocomposite hydrogels by grafting linear low density polyethylene (LLDPE) onto AA to form LLDPE-g-PAA/montmorillonite superabsorbent hydrogels. 67 In such a network, interactions between the -COOH or -COO À groups of AA and the -OH groups of the montmorillonite NPs are conceivable. Montmorillonite NPs specifically are utilized as multifunctional cross-linkers.…”

Section: In Situ Free Radical Polymerizationmentioning

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: In Situ Free Radical Polymerizationmentioning

confidence: 99%

Recent advances in clay mineral-containing nanocomposite hydrogels

et al. 2015

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“…1a-1c. Such materials are being increasing sought for biomedical applications [1]; BC hydrogels can be used for artificial blood vessels [2], ear cartilage implants [3], encasement for tissue regeneration [4][5][6][7], etc. The main advantages of a BC hydrogel, allowing using it in these biomedical applications, are its perfect biological compatibility and its microstructure [8].…”

Section: Introductionmentioning

confidence: 99%

Inelastic behaviour of bacterial cellulose hydrogel: In aqua cyclic tests

et al. 2015

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Citation: GAO, X. et al., 2015. Inelastic behaviour of bacterial cellulose hydrogel: in aqua cyclic tests. Polymer Testing, 44, Additional Information:• This paper was accepted for publication in the journal Poly- AbstractHydrogels are finding an increasingly broad use, especially in biomedical applications. Their complex structure -a low-density network of microfibrils -defines their non-trivial mechanical behaviour. The focus of this work is on test-based quantification of mechanical behaviour of a bacterial cellulose (BC) hydrogel exposed to cyclic loading. Specimens for the tests were produced using Gluconacetobacter xylinus ATCC 53582 and tested in aqua under uniaxial cyclic loading conditions in a displacement-controlled regime. Substantial microstructural changes were observed in the process of deformation. A combination of qualitative microstructural observations with quantitative force-displacement relations allowed identification of main deformation mechanisms, confirming inelastic behaviour of BC hydrogel under a loading-unloading-reloading regime. Elastic deformation was accompanied by non-elastic (viscoplastic) deformation in both tension and compression. This study also aims to establish a background for micromechanical modelling of overall properties of BC hydrogels.

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“…One of the possible explanations was that the aggravation of excessive RHC and the weakened RHC-network synergetic interactions decreased the swelling rates. Swelling kinetics can be expressed using the Voigt-based viscoelastic model (Kabiri et al 2003;Irani et al 2013) according to Eq. 2,…”

Section: Swelling Behaviors Of Superabsorbent Hydrogelsmentioning

confidence: 99%

Rice Husk Char/Poly-(Acrylic Acid-co-acrylamide) Superabsorbent Hydrogels: Preparation, Characterization, and Swelling Behaviors

2017

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A series of novel rice husk char/poly-(acrylic acid(AA)-co-acrylamide(AM)) superabsorbent hydrogels were synthesized by graft copolymerization. The effects of the rice husk char (RHC) loading on their miscibility, shapes, and chemical structures were studied, and their swelling behaviors, kinetics, and pH response were evaluated. During the preparation, RHC reacted with acrylic acid. The RHC at lower loads (< mass ratios of RHC and AA of 1%) was scattered well within the polymer matrix, but an excessive load might result in the formation of large agglomerates. The swelling capacity and swelling rate of the hydrogels first were both increased with the rising RHC loading to 1% and then declined with further RHC loading. The superabsorbent hydrogel containing 1% RHC had the highest water absorbency (869 g/g in deionized water and 97 g/g in 0.9% NaCl solution).

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Preparation and properties of linear low-density polyethylene-g-poly (acrylic acid)/organo-montmorillonite superabsorbent hydrogel composites

Cited by 78 publications

References 43 publications

Recent advances in clay mineral-containing nanocomposite hydrogels

Recent advances in clay mineral-containing nanocomposite hydrogels

Inelastic behaviour of bacterial cellulose hydrogel: In aqua cyclic tests

Rice Husk Char/Poly-(Acrylic Acid-co-acrylamide) Superabsorbent Hydrogels: Preparation, Characterization, and Swelling Behaviors

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