Double network hydrogels prepared from pH-responsive doubly crosslinked microgels

Lane, Thomas H.; Holloway, Julianne L.; Milani, Amir H.; Saunders, Jennifer; Freemont, Anthony J.; Saunders, Brian R.

doi:10.1039/c3sm51356d

Cited by 27 publications

(31 citation statements)

References 33 publications

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“…The G' (storage modulus) values had very low frequency dependence and the gels exhibited solid-like viscoelastic behaviour. The latter is a common feature reported for DX MGs 12,30 . The tan δ values (= G"/G') were less than 0.10 ( Fig.…”

Section: Dialing Up Doubly Crosslinked Microgel Modulusmentioning

confidence: 68%

Using click chemistry to dial up the modulus of doubly crosslinked microgels through precise control of microgel building block functionalisation

et al. 2015

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ABSTRACT:Doubly crosslinked microgels (DX MGs) are hydrogels constructed by covalently interlinked vinyl-functionalised microgel particles. Until now it has not been possible to precisely control the extent of vinyl functionalisation of the microgel (MG) particles which act as the colloidal building blocks for hydrogel assembly. Furthermore, the range of DX MGs prepared to date has been modest. This study addresses both of these challenges by constructing a new class of DX MG using MG particles that were vinyl functionalised by copper catalysed azide-alkyne cycloaddition (CuAAC). Here, poly(2-vinylpyridine-co-propargyl acrylate) (PVP-PA) MG particles were and DX MG mechanical properties, they also showed evidence of colloidal crystallinity which may lead to future photonic gel applications. Our CuAAC-based approach should be versatile and is expected to enable a range of new DX MGs to be prepared.

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Section: Dialing Up Doubly Crosslinked Microgel Modulusmentioning

confidence: 68%

Using click chemistry to dial up the modulus of doubly crosslinked microgels through precise control of microgel building block functionalisation

et al. 2015

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“…Smart or intelligent hydrogels can undergo a reversible change of any of their properties in response to an external physical (such as temperature, pressure, electric field or magnetic field) or chemical (pH, enzymatic condition or ionic strength of the medium etc.) stimulus . These soft materials have many potential applications in the fields of environmental, agricultural, biomedical and tissue engineering.…”

Section: Introductionmentioning

confidence: 99%

“…Generally, hydrogels have weak mechanical strength and poor toughness especially in their swollen state . Therefore, many approaches have been attempted to obtain sufficient mechanical properties of hydrogels which include the formation of hybrid hydrogels, semi‐interpenetrating polymer network hydrogels, double network (DN) hydrogels and nanocomposite hydrogels . Among the various approaches, the synthesis of DN hydrogels has gained remarkable attention to improve the strength of hydrogels in which one network acts as a reinforcing factor to the other, thus improving the strength properties of the hydrogels …”

Section: Introductionmentioning

confidence: 99%

Synthesis of multifunctional high strength, highly swellable, stretchable and self‐healable pH‐responsive ionic double network hydrogels

Dixit

Bag

Sharma

et al. 2018

Polymer International

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The multifunctional double network (DN) soft hydrogels reported here are highly swellable and stretchable pH‐responsive smart hydrogel materials with sufficient strength and self‐healing properties. Such multifunctional hydrogels are achieved using double crosslinking structures with multiple physical and chemical crosslinks. They consist of a copolymer network of acrylamide (AM) and sodium acrylate (Na‐AA) and other reversible network of poly(vinyl alcohol)–borax complex. They were characterized by Fourier transform IR analysis and studied for their hydrogen bonding and ionic interaction. The degree of equilibrium swelling was observed to be as high as 5959% (at pH 7.0) for a hydrogel with AM/Na‐AA = 25/75 wt% in the network (GS‐6 sample). The highest degree of swelling was observed to be 6494% at pH 8.5. The maximum tensile strength was measured to be 1670, 580 and 130 kPa for a DN hydrogel (GS‐2 sample: AM/Na‐AA =75/25 wt% with 20, 40 and 60 wt% water content, respectively). The self‐healing efficiency was estimated to be 69% for such a hydrogel. These multifunctional DN hydrogels with amalgamation of many functional properties are unique in hydrogel materials and such materials may find applications in sensors, actuators, smart windows and biomedical applications. © 2018 Society of Chemical Industry

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“…The interactions between the microgel particles and the hydrogel matrix have a great influence on the properties and functions of the material. The properties and structure of hydrogels with embedded, interpenetrated, or chemically crosslinked microgels have been studied …”

Section: Introductionmentioning

confidence: 99%

Chain Entanglements and Hydrogen Bonds in Carbopol Microgel Reinforced Hydrogel

Zhang

Zhao

Xiang

et al. 2016

Macro Chemistry & Physics

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Physical interaction between the microgel and the hydrogel matrix is a key issue in the rational design of microgel reinforced hydrogels. A pentaerythritol‐crosslinked poly(acrylic acid) (PAAc) microgel, named Carbopol, is composited with polyacrylamide (PAAm) hydrogel. The toughness of the hydrogel is significantly improved by constructing an interpenetrating network of Carbopol and PAAm. Chain entanglements within the composited hydrogel result in a strain‐hardening phenomenon and an efficient stress transfer from the PAAm matrix to the sacrificing network of Carbopol. Hydrogen bonds between PAAc and PAAm can be formed in an acidic environment, which function as reversible sacrificing bonds and further improve the stretchability of the hydrogel.

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Double network hydrogels prepared from pH-responsive doubly crosslinked microgels

Cited by 27 publications

References 33 publications

Using click chemistry to dial up the modulus of doubly crosslinked microgels through precise control of microgel building block functionalisation

Using click chemistry to dial up the modulus of doubly crosslinked microgels through precise control of microgel building block functionalisation

Synthesis of multifunctional high strength, highly swellable, stretchable and self‐healable pH‐responsive ionic double network hydrogels

Chain Entanglements and Hydrogen Bonds in Carbopol Microgel Reinforced Hydrogel

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