Green Chemistry, Год журнала: 2023, Номер 25(23), С. 9998 - 10009
Опубликована: Янв. 1, 2023
This work provides a strategy for synthesizing PGA-PBC-PGA triblock copolymers and allows the recovery of GL within 3.0 h through depolymerization in an 82% yield.
Язык: Английский
Macromolecules, Год журнала: 2023, Номер 56(15), С. 6019 - 6026
Опубликована: Июль 22, 2023
The development of chemically recyclable polymers with closed-loop life cycles is believed to be the most attractive strategy in creating circular plastic economy. Here, we successfully prepared a pair enantiopure O-heterocyclic lactones bearing pendent phenyl substituent, which are named (2S,7R)-7-methyl-2-phenyl-1,4-dioxepan-5-one (SR-M1) and (2R,7R)-7-methyl-2-phenyl-1,4-dioxepan-5-one (RR-M2), respectively, by using methanolysis product poly(3-hydroxybutyrate) (P3HB) as raw material. well-controlled ring-opening polymerizations SR-M1 RR-M2 were achieved presence MeAl[salen] catalyst produce poly(ether-ester)s controlled molecular weights, narrow dispersities, well-defined terminal groups. monomer stereoconfiguration has big impact on their polymerization kinetics thermodynamics well thermal mechanical properties resultant polyesters. Both P(SR-M1) P(RR-M2) exhibited recyclability. depolymerization polyesters back pristine monomers can easily realized stannous octoate solution.
Язык: Английский
Процитировано
11
Fundamental Research, Год журнала: 2024, Номер unknown
Опубликована: Июнь 1, 2024
The development of modern society is closely related to polymer materials. However, the improper disposal wastes not only squanders resources but also intensifies environmental issues, despite that energy recovery, physical recycling and chemical pathways have been developed tackle recycle reuse polymers. Among them, considered as most pivotal solution, it can depolymerize back monomers, which then repolymerize into Recently, remarkable progress has made in chemically recyclable polymers through monomer design shift "polymerization-depolymerization" equilibrium realize selective depolymerization achieve closed-loop. This article reviews closed-loop such polyesters, polycarbonates, sulfur-containing polymers, vinyl monomer-based well other types Moreover, challenges prospects this field are discussed.
Язык: Английский
Процитировано
4
Chemical Communications, Год журнала: 2024, Номер unknown
Опубликована: Янв. 1, 2024
Progress in chemical recycling of waste polyesters (waste plastic refinery) was reviewed and prospected, newly reported thermal catalysis, photocatalysis, electrocatalysis, biocatalysis the recycle PET-based product were introduced.
Язык: Английский
Процитировано
4
Macromolecules, Год журнала: 2025, Номер unknown
Опубликована: Фев. 17, 2025
Язык: Английский
Процитировано
0
Опубликована: Март 7, 2025
Язык: Английский
Процитировано
0
Chinese Journal of Chemistry, Год журнала: 2022, Номер 40(24), С. 2973 - 2980
Опубликована: Сен. 5, 2022
Comprehensive Summary Monomer design strategy has become a powerful tool to access polymers with desired and diverse functionalities. Here, we designed novel monomer 2‐((benzyloxy)methyl)‐1,4‐oxathiepan‐7‐one (BTO) via installing benzyl ether side chain the structure of 1,4‐oxathiepan‐7‐one (OTO). The ring‐opening polymerization BTO Zn1 as catalyst demonstrated characteristics living turnover frequency (TOF) up 2520 h −1 . With [BTO] 0 /[ ] /[I] feed ratio 2000/2/1, polymer high number‐average molecular weight ( M n = 536 kDa) narrow dispersity Ð 1.06) was obtained. produced glass transition temperature ‐17°C behaved an elastomer at room temperature. Consequently, copolymerized L ‐LA modulate mechanical properties P( ‐LA). When content is 10%, copolymer exhibits excellent strength (24 MPa) elongation break (270%), affording crystalline, hard, tough plastic material that combines ductility P(BTO) modulus In addition, oxidation P(BTO)‐SO 2 led improvement T g from 38°C. Debenzylation afforded ‐OH containing free hydroxyl groups. Ultimately, could be hydrolyzed under base condition recover corresponding acid intermediate, which used prepare again complete closed‐loop monomer.
Язык: Английский
Процитировано
10
Chemistry - An Asian Journal, Год журнала: 2022, Номер 18(3)
Опубликована: Дек. 15, 2022
The low temperature condition, long reaction time and associated high energy inputs involved in the polymerization process still hampered scalable production of poly(γ-butyrolactone) (PγBL) via ring-opening (ROP) strained γBL due to its unfavorable thermodynamics. In this contribution, we presented rapid ROP using a bisurea combination with an organophosphazene base as binary catalyst. Well-defined PγBL samples various terminal groups were prepared by different alcohol initiators. co-catalyst exhibited much higher catalytic activity even compared most active monourea previous report supported kinetic experiments. A moderate monomer conversion 61% was achieved within 10 mins, producing high-molecular-weight Mn up 37.5 kDa good mechanical properties. short considerably reduced cost for conducted at condition. This study may clear away obstacles practical applications PγBL.
Язык: Английский
Процитировано
9
Chemistry - An Asian Journal, Год журнала: 2023, Номер 18(7)
Опубликована: Фев. 9, 2023
A fully renewable bio-based bicyclic lactone containing a five-membered cyclic ketal moiety, 7-methyl-3,8,10-trioxabicyclo[5.2.1]decan-4-one (TOD), was synthesized through two-step acid-catalyzed process from glycerol and levulinic acid. The ring-opening polymerization (ROP) of TOD at 30°C with benzyl alcohol (BnOH) as the initiator 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD) catalyst can afford high molar mass PTOD cis-2.4-disubstitued 2-methyl 1,3-dioxolane moiety in its repeating unit. is an amorphous polymer glass transition temperature (Tg ) 13°C. It be hydrolyzed into structurally defined small molecules under acidic or basic conditions by selective cleavage either ester linkage respectively. TBD-catalyzed copolymerization L-lactide (L-LA) -20°C investigated. confirmed that L-LA polymerized quickly racemization to form PLA, followed slow incorporation formed PLA chains via transesterification. By varying feed ratios TOD, series random copolymers (PLA-co-PTOD) different tunable Tg s were obtained. Under conditions, PLA-co-PTOD degrades much faster than linkages. This work provides insights for development more sustainable acid-accelerated degradable alternatives aliphatic polyesters.
Язык: Английский
Процитировано
4
Chinese Journal of Polymer Science, Год журнала: 2023, Номер 42(2), С. 168 - 175
Опубликована: Ноя. 15, 2023
Язык: Английский
Процитировано
4
Current Opinion in Green and Sustainable Chemistry, Год журнала: 2022, Номер 37, С. 100656 - 100656
Опубликована: Июль 7, 2022
Polyhydroxyalkanoates (PHAs) are currently discussed as renewably sourced alternatives for fossil-based plastics. With microbial PHA production evolving into a more mature technology, new opportunities arise to use these materials beyond the application biopolymers. For example, C4 chiral hydroxy acid backbone of most abundant and readily available PHA, poly(3-hydroxybutyrate) (PHB), renders it an attractive circular carbon feedstock synthesis many polymers or value-added platform molecules such crotonic (R)-3-hydroxybutyric acid. The respective C4-platform is particularly promising current (bio)refinery options functionalized C4-monoacids limited show narrower product scope than sugar-based C3- C5-platforms. This concept expected translate well other PHAs containing microbially customizable chain length (C3-C14), further broadening portfolio building blocks.
Язык: Английский
Процитировано
6