Enhancement of the mechanical properties of organic–inorganic hybrid elastomers by introducing movable and reversible crosslinks

Yamashita, Naoki; Yamaoka, Kenji; Ikura, Ryohei; Yoshida, Daichi; Park, Junsu; Kato, Nobu; Kamei, Masanao; Ogura, Kentaro; Igarashi, Minoru; Nakagawa, Hideo; Takashima, Yoshinori

doi:10.1039/d3sm01101a

Cited by 3 publications

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References 59 publications

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“…Cyclodextrins (CDs) are cyclic oligosaccharides consisting of 6–8 α- d -glucose units and are obtained by green processes such as enzymatic reactions of natural sugars. , CDs can encapsulate hydrophobic molecules in their internal vacancies and form inclusion complexes. Based on the properties, CDs formed polyrotaxane structures with polymers. − Introduction of polyrotaxane structures to gels or elastomers improves the strengths and toughnesses of these materials. − We have focused on improving the mechanical properties of elastomers by introducing a “movable cross-link” generated by bulk copolymerization of CDs with acrylic monomers. − These cross-links are constructed by penetrating the acrylic polymer inside the CD cavities during polymerization. The cross-linking site does not depend on the specific position of the functional group on the polymer.…”

Section: Introductionmentioning

confidence: 99%

Recyclable Tough Adhesive Sheets with Movable Cross-Links for Sustainable Use

Kosaba,

Ikura,

Yamaoka

et al. 2024

ACS Appl. Mater. Interfaces

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Acrylic adhesive sheets have been used for many applications, from popular seal materials to high-end electrical devices. One of the basic and critical design features of adhesives is effective covalent cross-linking for superior adhesive properties. On the other hand, covalent cross-linking prevents reuse or recycling of the adhesive. This makes the adhesive sheets insoluble and poorly workable. For development of sustainable adhesives, we investigated the adhesive sheets based on acrylic elastomers with "Movable Cross-links" (M-PEA-CD (0.5)) copolymerized with 0.5 mol % cyclodextrin monomers. The peel strength and creep resistance of M-PEA-CD (0.5) were greater than those of adhesives (N-PEA) without any cross-links. M-PEA-CD (0.5) was recyclable via dissolution in ethyl acetate. Furthermore, the recycled M-PEA-CD (0.5) from solution exhibited the same adhesion properties as virgin M-PEA-CD (0.5). Spectroscopic and mechanical measurements indicated that topological cross-linking with Cyclodextrin (CD) moieties generated novel recyclable adhesive sheets without restricting the polymer main chains, unlike covalent cross-linking (CC-PEA). The movable cross-links were maintained in both the solid state and in solution, which allowed recycling of the elastomer via simple methods.

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