Optically transparent, high-toughness elastomer using a polyrotaxane cross-linker as a molecular pulley

Gotoh, Hiroaki; Liu, Chang; Imran, Abu Bin; Hara, Mitsuo; Seki, Takahiro; Mayumi, Koichi; Ito, Kohzo; Takeoka, Yukikazu

doi:10.1126/sciadv.aat7629

Cited by 134 publications

(140 citation statements)

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“…12). The similar modulus also indicated the introduction of low concentration of hydrogen bonds would have little effect on the average molecular weight between the crosslinking points 20 . To study the probable mechanism of mechanical behavior of PSeD-U elastomers, the stress-strain curve was divided into three regions depending on the different ranges of deformation ( Fig.…”

Section: Resultsmentioning

confidence: 93%

“…Similarly, these mechanical properties are also desirable for conformability and selfprotection of bio-integrated electronics especially electronic skin and wearable electronic devices 6 . However, it remains a challenge to develop elastic materials with a suitable combination of nonlinear viscoelasticity, toughness, softness, and stretchability to mimic skin's mechanical properties [18][19][20] . Some elastic materials, such as poly(dimethylsiloxane) (PDMS), polyurethane, polystyrene-block-poly(ethylene-ran-butylene)-block-polystyrene, have been used to fabricate stretchable electronic devices 15,[21][22][23][24] .…”

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confidence: 99%

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Mechanically and biologically skin-like elastomers for bio-integrated electronics

et al. 2020

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The bio-integrated electronics industry is booming and becoming more integrated with biological tissues. To successfully integrate with the soft tissues of the body (eg. skin), the material must possess many of the same properties including compliance, toughness, elasticity, and tear resistance. In this work, we prepare mechanically and biologically skin-like materials (PSeD-U elastomers) by designing a unique physical and covalent hybrid crosslinking structure. The introduction of an optimal amount of hydrogen bonds significantly strengthens the resultant elastomers with 11 times the toughness and 3 times the strength of covalent crosslinked PSeD elastomers, while maintaining a low modulus. Besides, the PSeD-U elastomers show nonlinear mechanical behavior similar to skins. Furthermore, PSeD-U elastomers demonstrate the cytocompatibility and biodegradability to achieve better integration with tissues. Finally, piezocapacitive pressure sensors are fabricated with high pressure sensitivity and rapid response to demonstrate the potential use of PSeD-U elastomers in bio-integrated electronics.

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Section: Resultsmentioning

confidence: 93%

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confidence: 99%

Mechanically and biologically skin-like elastomers for bio-integrated electronics

et al. 2020

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“…This indicates that the low Young's modulus of the slide-ring gel resultsf rom the pulley effect. [18] The hydrogels remainedi nt heir originals hape withouta ny damage on the surface after ten loading-unloading cycles at a given strain of 55 %( Figure 2D). Hysteresis loops were seen to indicatet he process of relaxation of the polymer chains.T he maximum stress of the hydrogels as well as the loops showed no obvious drop within the test of ten cycles.I nterestingly,t he squeezed HP-PRX 10 -ALD/GC gel recovered its originals hape rapidly ( Figure 2E).…”

Section: Resultsmentioning

confidence: 94%

Cell‐Encapsulating Hydrogel Puzzle: Polyrotaxane‐Based Self‐Healing Hydrogels

Cho

Ooya

2019

Chemistry A European J

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Slide-ring hydrogels using polyrotaxanes have been developed as highly tough soft materials. However, they have never been used as biomaterials because of the lack of biocompatibility.M eanwhile, self-healing hydrogels are expected to improve fatigue resistance and extend the period of use. However,o wing to the lack of high mechanical strength, they are limited in their use as biomaterials.Here we first developed ab iocompatibles elf-healing/slide-ring hydrogel using glycol chitosana nd aw ater-soluble polyrotaxane. We obtained excellentm echanical toughness and biocompatibility to promote the proliferation of human umbilical vein endothelial cells (HUVECs) encapsulatedi nt he hydrogel. Owing to the rapid self-healing property,t he cellencapsulating gels adjusted arbitrarily, maintaining good cell proliferation function. Therefore, slide-ring hydrogels enable the use of biomaterials for soft-tissue engineering.[a] Dr.

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“…However, the elastomer should be healed above 80 °C which was hardly acceptable for wearable electronics. Apart from these dynamic reversible bonds, movable crosslinking systems have been proved to confer polymers higher strain and toughness …”

Section: Introductionmentioning

confidence: 99%

A Highly Stretchable and Self‐Healing Supramolecular Elastomer Based on Sliding Crosslinks and Hydrogen Bonds

Zhu

et al. 2019

Adv Funct Materials

197

138

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The long application life and stable performance of stretchable electronics have been putting forward requirements for both higher mechanical properties and better self‐healing ability of polymeric substrates. However, for self‐healing materials, simultaneously improving stretchability and robustness is still challenging. Here, by incorporating sliding crosslinker (polyrotaxanes) and hydrogen bonds into a polymer, a highly stretchable and self‐healable elastomer with good mechanical strength is achieved. The elastomer exhibits very high stretchability, such that it can be stretched to 2800% with a fracture strength of 1.05 MPa. Moreover, the elastomer can achieve nearly complete self‐healing (93%) at 55 °C. Next, tensile tests under different temperatures, step extension experiments, and in situ small angle X‐ray scattering confirm that the excellent stretchability is attributed to the combined effects of sliding cyclodextrins along guest chains and hydrogen bonds. Furthermore, a strain sensor by coating the single‐wall carbon nanotubes onto the surface of the elastic substrate is fabricated.

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Optically transparent, high-toughness elastomer using a polyrotaxane cross-linker as a molecular pulley

Abstract: We prepared a mechanically tough, highly transparent elastomer by using a polyrotaxane cross-linker acting as a molecular pulley.

Cited by 134 publications

References 34 publications

Mechanically and biologically skin-like elastomers for bio-integrated electronics

Mechanically and biologically skin-like elastomers for bio-integrated electronics

Cell‐Encapsulating Hydrogel Puzzle: Polyrotaxane‐Based Self‐Healing Hydrogels

A Highly Stretchable and Self‐Healing Supramolecular Elastomer Based on Sliding Crosslinks and Hydrogen Bonds

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