Mechanically robust, readily repairable polymers via tailored noncovalent cross-linking

Yanagisawa, Yu; Nan, Yiling; Okuro, Kou; Aida, Takuzo

doi:10.1126/science.aam7588

Cited by 768 publications

(762 citation statements)

References 30 publications

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“…As the hydrogen bonds are non-covalent, they can form and break reversibly, [13] allowing fragmented hard domains to re-associate when deformation stops.T his behavior could indeed be responsible for the recovery of PL response observed during fast deformation experiments.C onsidering that the recovery of PL signal in Cu-HP40-50 is strictly monoexponential we conclude that the PL response profile in fact describes as ingle process that is likely crystallization of the hard phase with an observed rate constant of 0.93 AE 0.1 s À1 calculated from exponential PL recovery traces-a value corresponding to aprocess lifetime in the order of one second.…”

Section: Angewandte Chemiementioning

confidence: 99%

Tracking Local Mechanical Impact in Heterogeneous Polymers with Direct Optical Imaging

et al. 2018

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Structural heterogeneity defines the properties of many functional polymers and it is often crucial for their performance and ability to withstand mechanical impact. Such heterogeneity, however, poses a tremendous challenge for characterization of these materials and limits our ability to design them rationally. Herein we present a practical methodology capable of resolving the complex mechanical behavior and tracking mechanical impact in discrete phases of segmented polyurethane-a typical example of a structurally complex polymer. Using direct optical imaging of photoluminescence produced by a small-molecule organometallic mechano-responsive sensor we observe in real time how polymer phases dissipate energy, restructure, and breakdown upon mechanical impact. Owing to its simplicity and robustness, this method has potential in describing the evolution of complex soft-matter systems for which global characterization techniques fall short of providing molecular-level insight.

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Section: Angewandte Chemiementioning

confidence: 99%

Tracking Local Mechanical Impact in Heterogeneous Polymers with Direct Optical Imaging

et al. 2018

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“…Specifically, in heterogeneous chemically cross‐linked hydrogels, increasing the overall stress applied to the polymer chains induces chain fracture and finally results in the destruction of the hydrogel structure . In the past 10 years, many novel strategies have been adopted to enhance the mechanical properties of hydrogels via rational molecular and structural design . Among the resulting materials, NC gels have proven to be promising for improving the mechanical properties of hydrogels effectively due to their excellent NP–polymer synergies.…”

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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“…In addition to self‐healing feature, the use of metal complexes enlarges the properties and functionalities of the resulting materials, including but not limited to light responsive, solvatochromic, conductive, and highly stretchable polymers . Nevertheless, the current challenge in self‐healing materials lies in the design of materials that combine self‐healing ability and good mechanical properties . One of the strategies that has been used to overcome this limitation is the design of phase‐separated nanostructured polymers with the hard phase providing good mechanical properties while the soft one, equipped with the supramolecular bonds, endows the materials with the self‐healing behavior.…”

Section: Introductionmentioning

confidence: 99%

Self‐Healing Metallo‐Supramolecular Amphiphilic Polymer Conetworks

Mugemana

Grysan

Dieden

et al. 2020

Macro Chemistry & Physics

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The current challenge in self‐healing materials resides in the design of materials which exhibit improved mechanical properties and self‐healing ability. The design of phase‐separated nanostructures combining hard and soft phases represents an attractive approach to overcome this limitation. Amphiphilic polymer conetworks are nanostructured materials with robust mechanical properties, which can be tailored by tuning the polymer composition and chemical functionality. This article highlights the design of phase‐separated nanostructured polymers from metallo‐supramolecular amphiphilic polymer conetworks, and their application for self‐healing surfaces. The synthesis of poly(N‐(pyridin‐4‐yl)acrylamide)‐l‐polydimethylsiloxane polymer conetworks from the poly(pentafluorophenyl acrylate)‐l‐polydimethylsiloxane activated ester is presented. Loading of ZnCl2 salt into the phase‐separated polymer conetwork strengthens the network by cross‐linking the poly(N‐(pyridin‐4‐yl)acrylamide) phases, while offering reversible interactions needed for self‐healing ability.

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Mechanically robust, readily repairable polymers via tailored noncovalent cross-linking

Cited by 768 publications

References 30 publications

Tracking Local Mechanical Impact in Heterogeneous Polymers with Direct Optical Imaging

Tracking Local Mechanical Impact in Heterogeneous Polymers with Direct Optical Imaging

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

Self‐Healing Metallo‐Supramolecular Amphiphilic Polymer Conetworks

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