Multicomponent Polymerizations Provide Sustainable Sulfur (Selenium)-Containing Polyesters

Accounts of Chemical Research, Год журнала: 2025, Номер unknown

Опубликована: Март 31, 2025

ConspectusWith the rapid development of polymer industry, contradiction between synthetic polymers and sustainable human society is becoming more prominent. The advancement degradable plastics greatly contributes to sustainability our society. Synthetic containing precisely placed in-chain ester groups are expected be in a controlled manner. Their potential as environmentally benign significant. For this purpose, there clear need for their improved performance. Incorporating sulfur functional into polyesters can improve diverse crucial properties counterparts. However, lack related high-efficiency synthesis methods.In response issue, we designed series multicomponent polymerization methods library with tunable structure properties. This Account summarizes recent efforts discover approach. method uses readily available monomers including diols, diamines, H2O, diacrylates, carbonyl sulfide (COS), cyclic thioanhydrides, CO, selenium powder. usually carried out under mild conditions: at 60 90 °C, 2 12 h, using organobases catalysts or catalyst-free. approach achieves simultaneous incorporation sulfur/selenium thiocarbonate, thioether, thioester, thiourethane, selenoether.The has wide monomer scope yields structures. obtained possess weight-average molecular weights up 175.4 kDa. Most these thermally stable, exhibiting decomposition temperatures >200 °C. Due diversity structure, demonstrate extensively performance covering crystalline plastics, thermoplastic elastomers, amorphous plastics. These exhibit range glass-transition -60 72 °C melting 43 274 Notably, long alkyl chains (number carbon atoms ≥ 9) polyethylene-like crystallinity mechanical thiourethane amide enable enhanced thermal due inter/intramolecular hydrogen bonding. also easy degrade via alkali hydrolysis, alcohol enzymatic oxidation, etc. degradation products often have well-defined value-added even directly used repolymerization achieve closed-loop chemical cycle. Overall, presented furnishes facile versatile

Язык: Английский

Photoredox catalysis enabled selective C N bond cleavage in ring-strained tertiary amines

Tetrahedron Letters, Год журнала: 2025, Номер 167, С. 155666 - 155666

Опубликована: Май 23, 2025

Язык: Английский