2 research outputs found
Selective Synthesis of a [3]Rotaxane Consisting of Size-Complementary Components and Its Stepwise Deslippage
An α-cyclodextrin-based size-complementary [3]rotaxane with an alkylene axle was selectively synthesized in one pot via an end-capping reaction with 2-bromophenyl isocyanate in water. Thermal degradation of the [3]rotaxane product yielded not only the original components but also the [2]rotaxane. Thermodynamic studies suggested a stepwise deslippage process
Recyclable Tough Adhesive Sheets with Movable Cross-Links for Sustainable Use
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