Olefins from biobased sugar alcohols via selective, ru-mediated reaction in catalytic phosphonium ionic liquids. Dynamic remodeling of covalent networks via ring-opening metathesis polymerization. Medium-sized rings: conformational preferences in cyclooctanone driven by transannular repulsive interactions. Conformation and reactivity of medium-sized ring compounds. Investigation of the mechanism of polypentenamer degradation in the presence of metathesis catalysts. Depolymerization of bottlebrush polypentenamers and their macromolecular metamorphosis. A photochemical synthesis of functionalized trans-cyclooctenes driven by metal complexation. Enol ethers are effective monomers for ring-opening metathesis polymerization: synthesis of degradable and depolymerizable poly(2,3-dihydrofuran). Recent advances in the synthesis of cyclobutanes by olefin photocycloaddition reactions. Control of the intramolecular photocycloaddition in a bis-stilbene macrocycle. Control of (2π + 2π) photocycloaddition, cis−trans photoisomerization, and photocyclization. Synthesis and photochemical properties of stilbenophanes tethered by silyl chains. Enantiodifferentiating photocyclodimerization of cyclohexene sensitized by chiral benzenecarboxylates. A polymer with “locked” degradability: superior backbone stability and accessible degradability enabled by mechanophore installation. Synthesis and characterization of stereoregular ethylene-vinyl alcohol copolymers made by ring-opening metathesis polymerization. Synthesis of alkaline anion exchange membranes with chemically stable imidazolium cations: unexpected cross-linked macrocycles from ring-fused ROMP monomers. Highly conductive and chemically stable alkaline anion exchange membranes via ROMP of trans-cyclooctene derivatives. Ring-opening metathesis polymerization of 8-membered cyclic olefins.
Ring-opening metathesis polymerization of functionalized low-strain monomers with ruthenium-based catalysts. Variable temperature ROMP: leveraging low ring strain thermodynamics to achieve well-defined polypentenamers. Synthesis of narrow-distribution polycyclopentene using a ruthenium ring-opening metathesis initiator. Polypentenamer renaissance: challenges and opportunities. Handbook of Metathesis: Polymer Synthesis 2nd edn, Vol. A synthetic polymer system with repeatable chemical recyclability. Stretchable and fully degradable semiconductors for transient electronics. Cyclic poly(phthalaldehyde): thermoforming a bulk transient material. Thermally triggered degradation of transient electronic devices. Entropy of stereoregularity in aldehyde polymerization. Reversibility of the propagation reaction in polymerization processes and its manifestation in the phenomenon of a ‘ceiling temperature’. The reaction of sulfur dioxide with olefins: the ceiling temperature phenomenon. Chemical recycling to monomer for an ideal, circular polymer economy. Toward infinitely recyclable plastics derived from renewable cyclic esters.
Plastics of the future? The impact of biodegradable polymers on the environment and on society. P., Völker, C., Kramm, J., Landfester, K. The New Plastics Economy: Rethinking the Future of Plastics and Catalysing Action (Ellen MacArthur Foundation, 2017). The fused-ring monomer enables a broad scope of functionalities to be incorporated, providing access to chemically recyclable elastomers and plastics that show promise as next-generation sustainable materials. The additional ring converts the non-depolymerizable polycyclooctene into a depolymerizable polymer by reducing the ring strain energy in the monomer (from 8.2 kcal mol –1 in unsubstituted cyclooctene to 4.9 kcal mol –1 in the fused ring). The polymers are formed through ring-opening metathesis polymerization of cyclooctene with a trans-cyclobutane installed at the 5 and 6 positions.
EDISON 5 MOL FUSE SERIES
Here we report a series of chemically recyclable polymers that show excellent thermal stability (decomposition temperature >370 ☌) and tunable mechanical properties. Despite some progress, few depolymerizable polymers exhibit the desirable thermal stability and strong mechanical properties of traditional polymers. A promising solution to address the challenges in plastics sustainability is to replace current polymers with chemically recyclable ones that can depolymerize into their constituent monomers to enable the circular use of materials.
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