Journal of the American Chemical Society, Год журнала: 2024, Номер unknown
Опубликована: Дек. 16, 2024
High-level control over polymer stereochemistry leverages the fine-tuning of material properties, but it is still a formidable challenge in synthetic chemistry. Herein we prepared new class salph yttrium catalysts bearing axially chiral binaphthyl moieties for stereocontrolled polymerization
Язык: Английский
Chemical Society Reviews, Год журнала: 2024, Номер 53(19), С. 9609 - 9651
Опубликована: Янв. 1, 2024
We present the state-of-the-art of circular polymers based on monomer and polymer design reversible ring-opening addition polymerization reactions without involvement other reactants.
Язык: Английский
Процитировано
11
Angewandte Chemie, Год журнала: 2025, Номер unknown
Опубликована: Янв. 20, 2025
Abstract Poly(lactic‐ co ‐glycolic acid) (PLGA) has been widely employed for various biomedical applications owing to its biodegradability and biocompatibility. The discovery of the stereocomplex formation between enantiomeric alternating PLGA pairs underscored potential as high‐performance biodegradable materials with diverse material properties biodegradability. Herein, we have established a regio‐ stereoselective ring‐opening polymerization approach synthesis stereocomplexed isoenriched from racemic methyl‐glycolide ( rac ‐MG). high sequence tacticity control was accomplished by an optimized enantiopure scandium catalyst bearing spiro‐salen scaffold. Varying polymer stereoregularity P m 0.4 0.91 led transformation resulting amorphous semicrystalline materials. Notably, demonstrated enhanced melting transition temperature T up 191 °C) crystallization rate. This stereocontrolled represented versatile preparation
Язык: Английский
Процитировано
0
Angewandte Chemie International Edition, Год журнала: 2025, Номер unknown
Опубликована: Янв. 22, 2025
Degradable chalcogenide polyesters, e.g., polythioesters (PTEs), typically exhibit improved thermal, mechanical, and optical properties. Anionic ring-opening polymerization (ROP) of thionolactones, an intrinsically promising yet underexplored approach to accessing PTEs, however, is still limited by: intolerance metal catalysts, inadequate control over chain growth, the absence aromatic system. Monomer design-boosted mechanistic studies may address above challenges. Here, we present a new highly reactive thionolactone synthesized from 1,1'-binaphthyl-2,2'-diol (BINOL). Our investigations into kinetics thermodynamics have underscored importance rapid initiation, eventually leading discovery tetrabutylammonium 2-naphthyl-thiocarboxylate as distinctive initiator that enables genuinely controlled living thionolactones. Ultimately, atropisomerism inherent in BINOL has resulted creation axially chiral PTE materials with tailored molecular weights, enantiomeric compositions, topologies.
Язык: Английский
Процитировано
0
Angewandte Chemie, Год журнала: 2025, Номер unknown
Опубликована: Янв. 22, 2025
Abstract Degradable chalcogenide polyesters, e.g., polythioesters (PTEs), typically exhibit improved thermal, mechanical, and optical properties. Anionic ring‐opening polymerization (ROP) of thionolactones, an intrinsically promising yet underexplored approach to accessing PTEs, however, is still limited by: intolerance metal catalysts, inadequate control over chain growth, the absence aromatic system. Monomer design‐boosted mechanistic studies may address above challenges. Here, we present a new highly reactive thionolactone synthesized from 1,1′‐binaphthyl‐2,2′‐diol (BINOL). Our investigations into kinetics thermodynamics have underscored importance rapid initiation, eventually leading discovery tetrabutylammonium 2‐naphthyl‐thiocarboxylate as distinctive initiator that enables genuinely controlled living thionolactones. Ultimately, atropisomerism inherent in BINOL has resulted creation axially chiral PTE materials with tailored molecular weights, enantiomeric compositions, topologies.
Язык: Английский
Процитировано
0
Polymer science & technology., Год журнала: 2025, Номер unknown
Опубликована: Март 21, 2025
Язык: Английский
Процитировано
0
Chinese Journal of Polymer Science, Год журнала: 2025, Номер unknown
Опубликована: Май 20, 2025
Язык: Английский
Процитировано
0
ACS Macro Letters, Год журнала: 2024, Номер unknown, С. 1704 - 1710
Опубликована: Дек. 7, 2024
Recovering monomers from the depolymerization of thermosets presents a significant challenge, which becomes even more daunting if one sets goal doing it directly, i.e., without complex chemical separation steps. To this end, we have synthesized new type polycarbonate thermoset by first copolymerizing alkyl cyclic carbonates (ACCs) with small amounts allyloxy (AoCCs), followed cross-linking resulting excess tetrathiol compounds under UV irradiation. These cross-linked polycarbonates demonstrate enhanced thermal and mechanical properties compared to their linear analogues, while maintaining polymers' capacity for ring-closing depolymerization. The process enables direct recovery ACC its dimer, bypassing steps that are commonly employed in recycling conventional chemically recyclable thermosets. yields range 74.7% 91.7% depending on ratios AoCC Furthermore, recovered can be repolymerized AoCCs leading same quality initially one.
Язык: Английский
Процитировано
1
Synfacts, Год журнала: 2024, Номер 20(07), С. 0702 - 0702
Опубликована: Июнь 14, 2024
Key words ring-opening polymerization - axial chirality torsional strain polyesters
Язык: Английский
Процитировано
0
Chinese Journal of Polymer Science, Год журнала: 2024, Номер 42(10), С. 1525 - 1535
Опубликована: Сен. 2, 2024
Язык: Английский
Процитировано
0
Macromolecules, Год журнала: 2024, Номер 57(21), С. 10041 - 10052
Опубликована: Окт. 30, 2024
Poly(cyclopentenyl carbonate) (PCPC) is a recyclable polymer with great potential applications. However, the selective preparation of PCPC from cyclopentene oxide (CPO) and CO2 copolymerization chemical recycling back to original monomer CPO are challenge. In this work, it was found that heterometallic rare-earth metal(III)/Zn(II) complexes (RE(III)-Zn(II) complexes) supported by phenylenediamine-bridged triphenols could serve as highly active catalysts for give pure PCPC. Remarkably, same alone also promote depolymerization only simply raising reaction temperature up ca. 160 °C. The mechanisms were proposed.
Язык: Английский
Процитировано
0