Supramolecular Elastomers with Movable Cross-Linkers Showing High Fracture Energy Based on Stress Dispersion

Ikura, Ryohei; Park, Junsu; Osaki, Motofumi; Yamaguchi, Hiroyasu; Harada, Akira; Takashima, Yoshinori

doi:10.1021/acs.macromol.9b01198

Cited by 43 publications

(65 citation statements)

References 50 publications

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“…The second method is the formation of movable crosslinks through copolymerization between the macrocyclic monomer and main chain monomer. Movable crosslinked elastomers were prepared by bulk copolymerization between hydrophobic CD monomers and alkyl acrylate 73 . The formation of movable crosslinks depends on the cavity diameter of CD and the size of the main chain monomer.…”

Section: Formation Of Rotaxane/polyrotaxane Structures On the Main Chainmentioning

confidence: 99%

Design of self-healing and self-restoring materials utilizing reversible and movable crosslinks

et al. 2022

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Self-healing materials have attracted attention due to their ability to regain their structure and function after damage. In recent years, significant progress has been made in achieving various functions through supramolecular chemistry. This review describes an overview of the strategies used to prepare self-healing and self-restoring materials utilizing reversible and movable crosslinks. Reversible crosslinks, consisting of noncovalent bonds, can reversibly undergo repeated cleavage and reformation. Therefore, self-healing can be achieved by effectively regenerating reversible crosslinks between polymeric chains. Reversible crosslinks exploit many kinds of dynamic covalent bonds and noncovalent bonds, such as hydrogen bonds, metal coordination bonds, ionic interactions, π–π stacking, van der Waals forces, and hydrophobic interactions. Movable crosslinks exhibit self-restoring properties. Self-restoring materials can regain their original shape and mechanical properties after a cycle of loading and unloading external stress. Movable crosslinks consist of polymer chains that penetrate macrocyclic units and have self-restoring properties due to their sliding motion along the polymeric chains. In addition, multiple reversible cross-links produce synergistic effects to simultaneously achieve high toughness and effective self-healing. We believe that self-healing and self-restoring materials will play a substantial role in realizing a sustainable society.

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Section: Formation Of Rotaxane/polyrotaxane Structures On the Main Chainmentioning

confidence: 99%

Design of self-healing and self-restoring materials utilizing reversible and movable crosslinks

et al. 2022

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“…Such a phenomenon seems abnormal because the exchange reaction of dynamic bonds during stretching would increase energy dissipation to decrease elasticity. 17,48,49 The abnormality should be attributed to the different melting temperatures of BEG 1 S y s with different contents of disulfide bonds. BEG 1 S 2.5 and BEG 1 S 5 were crystalline at testing temperature (∼30 °C) just because they possessed T m above 30 °C, as shown in Table 3.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Highly Stretchable, Recyclable, and Fast Room Temperature Self-Healable Biobased Elastomers Using Polycondensation

et al. 2020

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The substitution of petroleum-based self-healing elastomers with biobased counterparts is crucial to the global sustainable development of the rubber industry, which highly depends on the ease of the synthesis procedure. Herein, we show that highly stretchable, recyclable, and self-healable biobased elastomers were synthesized via condensation polymerization of succinic acid, adipic acid, sebacic acid, and 1,4-butanediol in the presence of a small amount of glycerol as a curing agent and 3,3′-dithiodipropionic acid as a dynamic covalent monomer. The macroscopic properties of our elastomers, including thermal, mechanical, stress relaxation, and self-healing performance, were finely regulated via microscopic chemical and topological structure. As such, a highly stretchable (up to ∼1700%), recyclable (almost without degradation of the mechanical performance over several repeats), rapid room temperature self-healable (in 20 min) biobased vitrimeric elastomer was achieved, which is the first aliphatic disulfide metathesis assisted self-healing polymer achieved at such low temperatures. The ease of the polycondensation with which the elastomers can be readily scaled up points to exciting opportunities for sustainable polymers with minimal environmental impact.

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“…This behavior also implies the existence of cross‐links, although the mixture does not have a guest moiety. According to our previous report, [ 45 ] P‐AcβCD(3) and PEA seemed to form pseudorotaxane structures that function as cross‐links.…”

Section: Figurementioning

confidence: 85%

Extremely Rapid Self‐Healable and Recyclable Supramolecular Materials through Planetary Ball Milling and Host–Guest Interactions

et al. 2020

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The host–guest interaction as noncovalent bonds can make polymeric materials tough and flexible based on the reversibility property, which is a promising approach to extend the lifetime of polymeric materials. Supramolecular materials with cyclodextrin and adamantane are prepared by mixing host polymers and guest polymers by planetary ball milling. The toughness of the supramolecular materials prepared by ball milling is approximately 2 to 5 times higher than that of supramolecular materials prepared by casting, which is the conventional method. The materials maintain their mechanical properties during repeated ball milling treatments. They are also applicable as self‐healable bulk materials and coatings, and they retain the transparency of the substrate. Moreover, fractured pieces of the materials can be re‐adhered within 10 min. Dynamic mechanical analysis, thermal property measurements, small‐angle X‐ray scattering, and microscopy observations reveal these behaviors in detail. Scars formed on the coating disappear within a few seconds at 60 °C. At the same time, the coating shows scratch resistance due to its good mechanical properties. The ball milling method mixes the host polymer and guest polymer at the nano level to achieve the self‐healing and recycling properties.

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Supramolecular Elastomers with Movable Cross-Linkers Showing High Fracture Energy Based on Stress Dispersion

Cited by 43 publications

References 50 publications

Design of self-healing and self-restoring materials utilizing reversible and movable crosslinks

Design of self-healing and self-restoring materials utilizing reversible and movable crosslinks

Highly Stretchable, Recyclable, and Fast Room Temperature Self-Healable Biobased Elastomers Using Polycondensation

Extremely Rapid Self‐Healable and Recyclable Supramolecular Materials through Planetary Ball Milling and Host–Guest Interactions

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