Structurally Enhanced Hydrogel Nanocomposites with Improved Swelling and Mechanical Properties

Kaşgöz, Hasine; Durmuş, Ali; Kaşgöz, Ahmet; Aydın, İsmail

doi:10.1080/10601325.2012.631442

Cited by 5 publications

(3 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…By convention, the solvated polymer network chains are covalently linked by organic crosslinkers . Applications for hydrogels include wound dressings, incontinence pads, soft contact lenses, and water retention in agriculture . Many hydrogels are environmentally sensitive, that is, their water content, and hence size is dependent on temperature, humidity, and pH of their environment .…”

Section: Introductionmentioning

confidence: 99%

Nanocomposite hydrogels: Fracture toughness and energy dissipation mechanisms

Klein

Whitten

Resch

et al. 2015

J. Polym. Sci. Part B: Polym. Phys.

View full text Add to dashboard Cite

In this study, fracture toughness of nanocomposite hydrogels is quantified, and active mechanisms for dissipation of energy of nanocomposite hydrogels are ascertained. Poly(N,N-dimethylacrylamide) nanocomposite hydrogels are prepared by in situ free radical polymerization with the incorporation of Laponite, a hectorite synthetic clay. Transmission electron microscopy proves exfoliation of clay platelets that serve as multifunctional crosslinkers in the created physical network. Extraordinary high fracture energies of up to 6800 J m-2 are determined by the pure shear test approach, which shows that these soft and stretchable hydrogels are insensitive to notches. In contrast to single-and double-network hydrogels, dynamic mechanic analysis and stress relaxation experiments clarify that significant viscoelastic dissipation occurs during deformation of nanocomposite hydrogels. Similar to double-network hydrogels, crack tip blunting and plastic deformation also contribute to the observed massive fracture energies. In this study, fracture toughness of nanocomposite hydrogels is quantified, and active mechanisms for dissipation of energy of nanocomposite hydrogels are ascertained. Poly(N,N-dimethylacrylamide) nanocomposite hydrogels are prepared by in situ free radical polymerization with the incorporation of Laponite, a hectorite synthetic clay. Transmission electron microscopy proves exfoliation of clay platelets that serve as multifunctional crosslinkers in the created physical network. Extraordinary high fracture energies of up to 6800 J m 22 are determined by the pure shear test approach, which shows that these soft and stretchable hydrogels are insensitive to notches. In contrast to single-and double-network hydrogels, dynamic mechanic analysis and stress relaxation experiments clarify that significant viscoelastic dissipation occurs during deformation of nanocomposite hydrogels. Similar to double-network hydrogels, crack tip blunting and plastic deformation also contribute to the observed massive fracture energies.

show abstract

Section: Introductionmentioning

confidence: 99%

Nanocomposite hydrogels: Fracture toughness and energy dissipation mechanisms

Klein

Whitten

Resch

et al. 2015

J. Polym. Sci. Part B: Polym. Phys.

View full text Add to dashboard Cite

show abstract

“…Recently, polymer/clay nanocomposites have been studied to improve the properties of hydrogels such as swelling and deswelling properties and mechanical strength [4, 9–11]. Montmorillonite (MMT) [12, 13], kaolin [14], mica [15, 16], attapulgite [17], and halloysite [15] have already been incorporated into the polymer structure. However, to achieve the superior characteristics of nanocomposite hydrogels, it is necessary for clay platelets to act as multifunctional crosslinkers [11, 18–20].…”

Section: Introductionmentioning

confidence: 99%

Poly(2‐hydroxyethyl methacrylate) nanocomposites: From a nonionic gel to pH sensitivity

Cavusoglu

Kaşgöz

2011

Polymer Composites

Self Cite

View full text Add to dashboard Cite

2‐Hydroxyethyl methacrylate (HEMA)‐clay nanocomposites were prepared via in situ free radical polymerization using montmorillonite (MMT) as a crosslinker. The structure and surface morphology of the nanocomposites were characterized by Fourier transform infrared spectroscopy (FTIR), X‐ray diffraction, and scanning electron microscopy. It was found that exfoliated or highly expanded intercalated nanocomposite structure was obtained. The swelling degree was determined in distilled water and various pH buffered solutions. The highest swelling capacity in distilled water was observed for the nanocomposite sample prepared with the MMT amount of 10 % (w). It was seen that the diffusion mechanism was Fickian type in distilled water and also in various pH‐buffered solutions. It is interesting that the swelling degree of nanocomposites in alkaline pH values increased by the increasing of MMT in the polymer structure. This result supports the possibility of future applications of the novel nanocomposite in systems for the controlled released of drugs. POLYM. COMPOS., 2011. © 2011 Society of Plastics Engineers

show abstract

“…Magnetic particles usually contain Fe 3 O 4 , carbonyl iron (CI), and cobalt ferrite (CoFe 2 O 4 ). Their type, size, content, and distribution inside the hydrogels (isotropy and anisotropy) all have significant effects on the mechanical characteristics and controllability of magnetic hydrogels [1,[22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

A Comparison Study on the Magneto-Responsive Properties and Swelling Behaviors of a Polyacrylamide-Based Hydrogel Incorporating with Magnetic Particles

Wang

2021

IJMS

View full text Add to dashboard Cite

This work investigates the mechanical properties, microstructures, and water-swelling behavior of a novel hydrogel filled with magnetic particles. The nanoparticles of magnetite (Fe3O4) and the micro-particles of carbonyl iron (CI) were selected and filled into a polyacrylamide (PAAM) hydrogel matrix to create two types of magnetic hydrogels. The isotropy and anisotropy of magnetic hydrogels are also presented in this study. The isotropic samples were cured without applying a magnetic field (MF), and the anisotropic samples were cured by applying an MF in the direction perpendicular to the thickness of the samples. The effects of the size, content, and inner structures of magnetic particles on the magneto-responsive and swelling properties of magnetic hydrogels were investigated. It was found that the magnetorheological (MR) effect of anisotropic samples was apparently higher than that of isotropic samples, and the hydrogels with CI exhibited a noticeable MR effect than those with Fe3O4. The storage modulus can be enhanced by increasing the filler content and size, forming an anisotropic structure, and applying an external MF. In addition, the magnetic hydrogels also have a swelling ability that can be tuned by varying the content and size of the particle fillers.

show abstract

Structurally Enhanced Hydrogel Nanocomposites with Improved Swelling and Mechanical Properties

Cited by 5 publications

References 45 publications

Nanocomposite hydrogels: Fracture toughness and energy dissipation mechanisms

Nanocomposite hydrogels: Fracture toughness and energy dissipation mechanisms

Poly(2‐hydroxyethyl methacrylate) nanocomposites: From a nonionic gel to pH sensitivity

A Comparison Study on the Magneto-Responsive Properties and Swelling Behaviors of a Polyacrylamide-Based Hydrogel Incorporating with Magnetic Particles

Contact Info

Product

Resources

About