Unprecedented associative exchange in CO₂-sourced cyclic S,O-acetal-based covalent adaptable networks

Polymer Chemistry, Journal Year: 2024, Volume and Issue: 15(22), P. 2296 - 2307

Published: Jan. 1, 2024

An unexplored associative dynamic exchange reaction between CO 2 -sourced cyclic S , O -acetals and thiolates was investigated utilized to create covalent adaptable networks suitable for the production of healable coatings.

Language: Английский

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Deconstruction of unsaturated polymers through photo-mediated oxidation under O2

Cell Reports Physical Science, Journal Year: 2024, Volume and Issue: 5(8), P. 102104 - 102104

Published: July 12, 2024

While oxidative cleavage has been a well-known strategy to degrade unsaturated polymers, most processes require harsh conditions and/or expensive oxidizing agents. Using O2 polymers is highly desirable, but no reported process well controlled for the chemical recycling of polymers. Here, we report photo-mediated degradation under using an earth-abundant Mn catalyst, and demonstrated with polybutadiene, polydicyclopentadiene, dehydrogenated polyethylene. Nonactivated internal alkenes in these can be effectively cleaved without elevated temperature or pressure. The oxidation generates acetal as main functionality, which used further recycling. As proof concept, oligomers end groups, resulting from are shown undergo transacetalization polyols form polymer network. here holds promise hydrocarbon mild cost-effective fashion.

Language: Английский

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Synthesis of Dynamic Polyurethanes by Utilizing Low-Transition-Temperature Mixtures of Pyrogallol and Poly(ethylene glycol)

ACS Applied Polymer Materials, Journal Year: 2024, Volume and Issue: 6(15), P. 8786 - 8797

Published: July 24, 2024

Dynamic covalent networks exhibit intriguing reprocessing and self-healing properties, but they usually require complex synthesis procedures frequently use hazardous solvents. Herein, we proposed a green strategy for dynamic polyurethane that was conducted in one-pot, solvent-free manner addresses the aforementioned problems. A new type of low-transition-temperature mixture (LTTM) prepared by blending pyrogallol poly(ethylene glycol), which allowed reagents to remain as liquids at room temperature. The formation LTTMs ascribed presence intermolecular hydrogen-bonding van der Waals interactions between molecules two reagents. Self-healing reprocessable with dissociative exchangeable phenol–carbamate bonds synthesized incorporating hexamethylene diisocyanate trimer third component into LTTMs, followed thermal curing. properties could be adjusted modifying content LTTMs. preparation did not any purification steps solvents, provides an innovative approach polymer is efficient environmentally friendly.

Language: Английский

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Poly(carbonate acetal) Vitrimers with Enhanced Thermal Properties and Closed-Loop Thermal Recyclability Derived from Waste Polycarbonate-Derived Polyaldehyde and Pentaerythritol/Erythritol/D-Sorbitol

Green Chemistry, Journal Year: 2024, Volume and Issue: 26(19), P. 10275 - 10289

Published: Jan. 1, 2024

Manufactured poly(carbonate acetal) vitrimers from waste polycarbonate and studied their properties along with closed-loop chemical recycling.

Language: Английский

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Hydrolytically Stable Dual-Dynamic Polyurethane Networks from Furfural

ACS Applied Polymer Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 18, 2024

Language: Английский

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