pH/temperature double responsive behaviors and mechanical strength of laponite-crosslinked poly(DEA-<i>co</i>
-DMAEMA) nanocomposite hydrogels

Li, Huili; Wu, Ren‐Jang; Zhu, Jinlong; Guo, Pingping; Ren, Wenchen; Xu, Shimei; Wang, Jide

doi:10.1002/polb.23713

Cited by 34 publications

(14 citation statements)

References 38 publications

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“…Figure a showed the FTIR spectra of Laponite, PHEAA, and HL8 gels to illustrate the interactions between PHEAA and Laponite nanoplatelets. It could be found that besides SiO stretching vibration band near 1005 cm −1 , the PHEAA/Laponite NC gels also exhibited NH bending vibration band (amide II) at 1560 cm −1 and CO stretching vibration band (amide I) at 1653 cm −1 , indicating the formation of PHEAA. Moreover, a broad peak, around 3402 cm −1 for the NH or OH stretching vibration bands of PHEAA gel, shifted to a lower wavenumber in HL8 NC gel, inferring there are PHEAA–Laponite interactions in PHEAA/Laponite NC gels.…”

Section: Resultsmentioning

confidence: 96%

Nanoclay Reinforced Self‐Cross‐Linking Poly(N‐Hydroxyethyl Acrylamide) Hydrogels with Integrated High Performances

Liu

Yang

et al. 2018

Macro Materials & Eng

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Despite recent significant progress in fabricating tough hydrogels, it is still a challenge to realize high strength, large stretchability, high toughness, rapid recoverability, and good self‐healing simultaneously in a single hydrogel. Herein, Laponite reinforced self‐cross‐linking poly(N‐hydroxyethyl acrylamide) (PHEAA) hydrogels (i.e., PHEAA/Laponite nanocomposite [NC] gels) with dual physically cross‐linked network structures, where PHEAA chains can be self‐cross‐linked by themselves and also cross‐linked by Laponite nanoplatelets, demonstrate integrated high performances. At optimal conditions, PHEAA/Laponite NC gels exhibit high tensile strength of 1.31 MPa, ultrahigh tensile strain of 52.23 mm mm−1, high toughness of 2238 J m−2, rapid self‐recoverability (toughness recovery of 79% and stiffness recovery of 74% at room temperature for 2 min recovery without any external stimuli), and good self‐healing properties (strain healing efficiency of 42%). The work provides a promising and simple strategy for the fabrication of dual physically cross‐linked NC gels with integrated high performances, and helps to expand the fundamentals and applications of NC gels.

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Section: Resultsmentioning

confidence: 96%

Nanoclay Reinforced Self‐Cross‐Linking Poly(N‐Hydroxyethyl Acrylamide) Hydrogels with Integrated High Performances

Liu

Yang

et al. 2018

Macro Materials & Eng

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“…The addition of these clay minerals can increase the ionization of polymers, following a chain expansion in response to pH. Recently, Li et al 128 successfully synthesized pH/temperature double-responsive nanocomposite hydrogels consisting of poly-(DMA-co-(2-dimethylamino)ethyl methacrylate (DMAEMA)) crosslinked by LAPONITE s NPs. In addition, due to the extra ionic charge provided by CNPs, the incorporation of CNPs into the polymer hydrogels brought about distinct nanocomposite hydrogels that can undergo significant electro-responsive changes.…”

Section: Stimuli-responsivenessmentioning

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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“…In addition, the dispersion of nanoclays such as montmorillonite and laponite is pH‐dependent due to their edge charges, which influence the ionization of the polymer in response to pH. For example, a pH/temperature dual‐responsive NC gel was prepared by the incorporation of laponite into poly(diethylacrylamide (DEA)‐ co ‐(2‐dimethylamino) ethyl methacrylate) (DMAEMA) . The swelling ratio of the hydrogels varied in buffer of different pH values.…”

Section: Properties Of Nanocomposite Hydrogelsmentioning

confidence: 99%

Nanoparticle–Polymer Synergies in Nanocomposite Hydrogels: From Design to Application

Chen

Hou

Ren

et al. 2018

Macromol. Rapid Commun.

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Hydrogels are an important class of soft materials with high water retention that exhibit intelligent and elastic properties and have promising applications in the fields of biomaterials, soft machines, and artificial tissue. However, the low mechanical strength and limited functions of traditional chemically cross-linked hydrogels restrict their further applications. Natural materials that consist of stiff and soft components exhibit high mechanical strength and functionality. Among artificial soft materials, nanocomposite hydrogels are analogous to these natural materials because of the synergistic effects of nanoparticle (NP) polymers in hydrogels construction. In this article, the structural design and properties of nanocomposite hydrogels are summarized. Furthermore, along with the development of nanocomposite hydrogel-based devices, the shaping and potential applications of hydrogel devices in recent years are highlighted. The influence of the interactions between NPs and polymers on the dispersion as well as the structural stability of nanocomposite hydrogels is discussed, and the novel stimuli-responsive properties induced by the synergies between functional NPs and polymeric networks are reviewed. Finally, recent progress in the preparation and applications of nanocomposite hydrogels is highlighted. Interest in this field is growing, and the future and prospects of nanocomposite hydrogels are also reviewed.

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pH/temperature double responsive behaviors and mechanical strength of laponite-crosslinked poly(DEA-co -DMAEMA) nanocomposite hydrogels

Cited by 34 publications

References 38 publications

Nanoclay Reinforced Self‐Cross‐Linking Poly(N‐Hydroxyethyl Acrylamide) Hydrogels with Integrated High Performances

Nanoclay Reinforced Self‐Cross‐Linking Poly(N‐Hydroxyethyl Acrylamide) Hydrogels with Integrated High Performances

Recent advances in clay mineral-containing nanocomposite hydrogels

Nanoparticle–Polymer Synergies in Nanocomposite Hydrogels: From Design to Application

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