A gas-plastic elastomer that quickly self-heals damage with the aid of CO2 gas

Miwa, Yohei; Taira, Kenjiro; Kurachi, Junosuke; Udagawa, Taro; Kutsumizu, Shoichi

doi:10.1038/s41467-019-09826-2

Cited by 63 publications

(63 citation statements)

References 43 publications

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“…For carbon-backbone polymers, introducing ionic groups into polymers results in the formation of ionic aggregates and changes the mechanical and thermal properties of polymers [8][9][10] . In polysiloxanes, ionic groups are often attached to tune the material properties for diverse applications [11][12][13][14][15][16] . Several attempts have been made, and in these cases, the amount of ionic groups introduced is less than half of the total monomer units.…”

Section: Introductionmentioning

confidence: 99%

Simple Linear Ionic Polysiloxane Showing Unexpected Nanostructure and Mechanical Properties

Hara

Iijima

Nagano

et al. 2021

Preprint

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Polysiloxanes are ubiquitous materials in industry and daily life derived from silicates, an abundant resource. They exhibit various properties, which depend on the main-chain network structure. Linear (1D backbone) polysiloxanes provide amorphous materials. They are recognized as fluid materials in the form of grease or oil with a low glass transition temperature. Herein we report that a simple linear polysiloxane, poly(3-aminopropylmethylsiloxane) hydrochloride, shows an elastic modulus comparable to that of stiff resins such as poly(tetrafluoroethylene). By introducing an ammonium salt at all the units of this polysiloxane, inter- and intramolecular ionic aggregates form, immensely enhancing the elastic modulus. This polysiloxane is highly hygroscopic, and its modulus can be altered reversibly 100 million times between moist and dry atmospheres. In addition, it works as a good adhesive for glass substrates with a shear strength of more than 1 MPa in the dry state. Despite its simple structure with a flexible backbone, this polymer unexpectedly self-assembles to form an ordered lamellar nanostructure in dry conditions. Consequently, this work reveals new functions and possibilities for polysiloxanes materials by densely introducing ionic groups.

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Section: Introductionmentioning

confidence: 99%

Simple Linear Ionic Polysiloxane Showing Unexpected Nanostructure and Mechanical Properties

Hara

Iijima

Nagano

et al. 2021

Preprint

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“…Introducing the concept of self-healing into rubber is an ideal method in the development of smart materials in recent years. 3,4 Until now, a broad range of self-healing methods of polymers has emerged. They are able to repair mechanical damage Shunxin Li and Ruofan Liu contributed equally to this study.…”

Section: Introductionmentioning

confidence: 99%

The study of ionic and entanglements self‐healing behavior of zinc dimethacrylate enhanced natural rubber and natural rubber/butyl rubber composite

Zhao

Chen

Yuan

et al. 2021

J of Applied Polymer Sci

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This study reported the self-healing behavior of natural rubber (NR) and NRbutyl rubber (IIR) composites, which was enhanced by graft-polymerization of zinc dimethacrylate (ZDMA) onto rubber chains. Using dicumyl peroxide (DCP) as the vulcanization agent formed a reversible covalent/ionic crosslinking supermolecular network. By controlling the vulcanization process, a reversible supramolecular network composed of covalent cross-linking, ionic cross-linking, and physical entanglement is obtained. Experiments shown that the self-repairing behavior of ionic bonds comes from the recombination of ionic clusters. Although the saturated backbone of IIR is hardly to provide ionic or covalent crosslinks, the addition of IIR can increase the degree of physical entanglements level of rubber and provide physical self-healing behavior. The entanglement healing is weaker than ionic cross-linking, but due to the better chain mobility, the multiple times healing ability of IIR introduced by entanglements is better than covalent or ionic bonds.

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“…With easy processability, gas permeability, and biocompatibility, PDMS was widely used for encapsulation of electronic devices. [ 33 ] Therefore, NO produced could pass through from NO‐wLED to the body, and superhydrophobic PDMS [ 34 ] could also protect GSNO from metal ions which could also trigger NO generation from GSNO. [ 30 ] Next, anticancer studies of NO‐wLED were performed to realize controllable and efficient inhibition of cancer in orthotopic and postsurgical colon cancer in mouse models.…”

Section: Methodsmentioning

confidence: 99%

Nitric Oxide Release Device for Remote‐Controlled Cancer Therapy by Wireless Charging

Peng

et al. 2020

Advanced Materials

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Traditional phototherapies face the issue that the insufficient penetration of light means it is difficult to reach deep lesions, which greatly reduces the feasibility of cancer therapy. Here, an implantable nitric oxide (NO)‐release device is developed to achieve long‐term, long‐distance, remote‐controllable gas therapy for cancer. The device consists of a wirelessly powered light‐emitting diode (wLED) and S‐nitrosoglutathione encapsulated with poly(dimethylsiloxane) (PDMS), obtaining the NO‐release wLED (NO‐wLED). It is found that NO release from the NO‐wLED can be triggered by wireless charging and the concentration of produced NO reaches 0.43 × 10−6 m min−1, which can achieve a killing effect on cancer cells. In vivo anticancer experiments exhibit obvious inhibitory effect on the growth of orthotopic cancer when the implanted NO‐wLED is irradiated by wireless charging. In addition, recurrence of cancer can be prevented by NO produced from the NO‐wLED after surgery. By illumination in the body, this strategy overcomes the poor penetration and long‐wavelength dependence of traditional phototherapies, which also provides a promising approach for in vivo gas therapy remote‐controlled by wireless charging.

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A gas-plastic elastomer that quickly self-heals damage with the aid of CO2 gas

Cited by 63 publications

References 43 publications

Simple Linear Ionic Polysiloxane Showing Unexpected Nanostructure and Mechanical Properties

Simple Linear Ionic Polysiloxane Showing Unexpected Nanostructure and Mechanical Properties

The study of ionic and entanglements self‐healing behavior of zinc dimethacrylate enhanced natural rubber and natural rubber/butyl rubber composite

Nitric Oxide Release Device for Remote‐Controlled Cancer Therapy by Wireless Charging

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