Mechanical response of HEMA gel under cyclic deformation: Viscoplasticity and swelling-induced recovery

Drozdov, Aleksey D.; Sanporean, Catalina-Gabriela; Christiansen, Jesper de Claville

doi:10.1016/j.ijsolstr.2014.10.009

Cited by 14 publications

(3 citation statements)

References 66 publications

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“…Second, hydrogels are soft solids and under high normal loads will thus deform substantially. [23,24]. This in turn affects the shape of the contacting surfaces and with that the contact area and pressure [13,18].…”

Section: Introductionmentioning

confidence: 99%

Natural and induced surface roughness determine frictional regimes in hydrogel pairs

Rudge

Scholten

Dijksman

2020

Tribology International

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Hydrogels display extremely complex frictional behavior with surprisingly slippery surfaces. We measure the sliding behavior of hydrogels submerged in water using a custom-made tribotool. Samples with an imposed surface roughness give two distinct frictional regimes. Friction coefficients in the first regime change with asperity sizes and Young's moduli. Under increased normal force, a second frictional regime emerges likely due to smoothening of asperities. Friction coefficients in the second regime remain constant across length scales of roughness and appear to be material specific. The hydrogel polymer network also directly influences the surface topography, and with that, the frictional behavior of hydrogels. We highlight the tribological importance of surface roughness at different length scales, which provides potential to engineer functional frictional behavior.

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Section: Introductionmentioning

confidence: 99%

Natural and induced surface roughness determine frictional regimes in hydrogel pairs

Rudge

Scholten

Dijksman

2020

Tribology International

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“…Generally, the reaction time is limited due to the risk of polymer formation in the solution because of chain transfer to the monomers and the solvent, which is associated with a strong increase in viscosity. Since the reaction mixture inside the polymerization reaction turns into a gel, this process is called gelling [42,43,44,45]. To avoid gelling at higher reaction temperatures the time had to be reduced.…”

Section: Resultsmentioning

confidence: 99%

“…After EB activation of the ETFE membrane with a dose of 100 kGy the solvent content selected was 60% and the reaction temperature was set to 60 °C. This avoids the formation of significant amounts of polymer in the reaction mixture, which is not grafted to the backbone material [42,43,44,45]. To reduce the polymerization time, it appeared important to decrease the solvent content in the polymerization mixture and to enhance the polymerization temperature.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Polymer Electrolyte Membranes via Radiation-Induced Graft Copolymerization on Poly(ethylene-alt-tetrafluoroethylene) (ETFE) Using the Crosslinker N,N′-Methylenebis(acrylamide)

Drache

Gohs

et al. 2018

Membranes

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Polymer electrolyte membranes (PEM) prepared by radiation-induced graft copolymerization are investigated. For this purpose, commercial poly(ethylene-alt-tetrafluoroethylene) (ETFE) films were activated by electron beam treatment and subsequently grafted with the monomers glycidyl methacrylate (GMA), hydroxyethyl methacrylate (HEMA) and N,N′-methylenebis(acrylamide) (MBAA) as crosslinker. The target is to achieve a high degree of grafting (DG) and high proton conductivity. To evaluate the electrochemical performance, the PEMs were tested in a fuel cell and in a vanadium redox-flow battery (VRFB). High power densities of 134 mW∙cm−2 and 474 mW∙cm−2 were observed, respectively.

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Two‐scale computational homogenization of calcified hydrogels

Aygün

Klinge²

2023

Math Methods in App Sciences

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The development of new type of hydrogels featuring enhanced properties is a recent topic and of particular interest for a wide range of industrial applications, especially in biomedical sector. The present contribution focuses on the mutliscale modeling of hydrogels that are treated by the enzymatic mineralization and thus enriched with calcium phosphate. More specifically, the calcium phosphate forms spherical or honeycomb structures in the hydrogel matrix, which significantly improves effective material properties such as stiffness and strength. The chosen multiscale finite element method (FEM) homogenization strategy uses the Hill–Mandel macrohomogeneity condition for bridging two scales: the macroscopic boundary value problem (BVP) simulates the specimen behavior, whereas the microscopic BVP investigates the representative volume element (RVE) depicting the heterogeneous multiphase microstructure. The approach proposed uses the Ogden model to simulate the hydrogel and the neo‐Hooke model for the calcium phosphate phase. It varies the RVE type and the macroscopic tests in order to study the influence of the microstructure on the effective behavior and uses experimental data to determine missing microscopic material parameters. Chosen numerical examples demonstrate the applicability of the numerical tool for the estimation of the optimal microscopic arrangement of phases.

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Mechanical response of HEMA gel under cyclic deformation: Viscoplasticity and swelling-induced recovery

Cited by 14 publications

References 66 publications

Natural and induced surface roughness determine frictional regimes in hydrogel pairs

Natural and induced surface roughness determine frictional regimes in hydrogel pairs

Preparation of Polymer Electrolyte Membranes via Radiation-Induced Graft Copolymerization on Poly(ethylene-alt-tetrafluoroethylene) (ETFE) Using the Crosslinker N,N′-Methylenebis(acrylamide)

Two‐scale computational homogenization of calcified hydrogels

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