Controllable bulk solvent-free melt ring-opening polymerization (ROP) of l-lactide catalyzed by Ni(II) and Ni(II)–Ln(III) complexes based on the Salen-type Schiff-base ligand

Jin, Wen Juan; Ding, Liang; Chu, Zeng; Chen, Leilei; Lü, Xingqiang; Zheng, Xiaoyan; Song, Jirong; Fan, Daidi

doi:10.1016/j.molcata.2011.01.009

Cited by 21 publications

(8 citation statements)

References 40 publications

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“…Ln-based heterometallic ROP complexes have also been extended beyond alkali metals to Al 58 , Mg 59 and Ni 60 . Heterometallic Ln/Al (Ln = Y, Sm) complexes 18a-d (Fig.…”

Section: Ring-opening Polymerisationmentioning

confidence: 99%

“…Heterometallic Ln/Ni(II) complexes 20a-g (Fig. 4 , Ln = Ce, Nd, Sm, Eu, Tb, Ho and Tm) were tested for l-LA ROP 60 , however despite the improved control, all were less active than mono-Ni species. This was attributed to the Ln(NO 3 ) 3 moiety occupying the outer O 2 O 2 salen cavity thus sterically hindering the monomer approach to Ni in the N 2 O 2 core.…”

Section: Ring-opening Polymerisationmentioning

confidence: 99%

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Advances in heterometallic ring-opening (co)polymerisation catalysis

2021

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Truly sustainable plastics require renewable feedstocks coupled with efficient production and end-of-life degradation/recycling processes. Some of the most useful degradable materials are aliphatic polyesters, polycarbonates and polyamides, which are often prepared via ring-opening (co)polymerisation (RO(CO)P) using an organometallic catalyst. While there has been extensive research into ligand development, heterometallic cooperativity offers an equally promising yet underexplored strategy to improve catalyst performance, as heterometallic catalysts often exhibit significant activity and selectivity enhancements compared to their homometallic counterparts. This review describes advances in heterometallic RO(CO)P catalyst design, highlighting the overarching structure-activity trends and reactivity patterns to inform future catalyst design.

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“…Ln-based heterometallic ROP complexes have also been extended beyond alkali metals to Al 58 , Mg 59 and Ni 60 . Heterometallic Ln/Al (Ln = Y, Sm) complexes 18a-d (Fig.…”

Section: Ring-opening Polymerisationmentioning

confidence: 99%

Section: Ring-opening Polymerisationmentioning

confidence: 99%

Advances in heterometallic ring-opening (co)polymerisation catalysis

2021

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“…In both cases, the catalyst efficiency decreased with the lengthening of the Ni‧‧‧Ln intramolecular distance, while the dependency on the lanthanide contraction was observed just for the latter set of complexes. In 2011, a series of heterobimetallic Ni-Ln(III) (Ln = lanthanide) complexes derived from the compounds 70 and 71 were reported by Bao, Lü et al (Figure 14) [59][60][61]. In terms of activity, the bimetallic species proved less performing than their monometallic analogues and required higher temperatures and/or longer reaction times to achieve moderate monomer conversions.…”

Section: Nickelmentioning

confidence: 99%

Synthesis of Biodegradable Polymers: A Review on the Use of Schiff-Base Metal Complexes as Catalysts for the Ring Opening Polymerization (ROP) of Cyclic Esters

2020

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“…The difference in morphology is due to the variation in solubility, i.e. base and zinc salt are more soluble in water, so the mass transport of ions is facilitated in this reaction medium and the nucleation and growth of ZnO particles are faster and more complex producing star-like microparticles [7,8]. .…”

Section: Effect Of Zno Morphology/size On the Production Of Plamentioning

confidence: 99%

Use of Micro- and Nano-ZnO particles as Catalysts for the Microwave-Assisted Polymerization ofD,L-lactide

Rodríguez-Tobías¹,

Morales²,

Enríquez³

et al. 2015

MRS Proc.

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The use of a catalyst is required to synthesize poly(D,L-lactide) (PLA) and tin (II) 2-ethylhexanoate could be highlighted among them. However, this kind of catalysts can produce bio-dangerous compounds limiting the PLA in medical applications, therefore there is a need to investigate novel bio-safe catalysts. Taking into account this problem, this communication reports the use of micro-and nano-ZnO particles as catalysts for the microwave-assisted polymerization of D,L-lactide. By microwave heating a high monomer conversion (higher than 95%) was achieved in a relatively short reaction time (3 hours). Morphology/size and concentration of ZnO particles presented a strong effect on the production of PLA, star-like microparticles leaded to conversion ca. 25%, well below to the values achieved with the nanoparticles. Furthermore, the formation of a ZnO-PLA hybrid was evidenced by spectroscopic and thermal characterization techniques. The methodology herein developed represents a new pathway for the green synthesis of PLA.

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Controllable bulk solvent-free melt ring-opening polymerization (ROP) of l-lactide catalyzed by Ni(II) and Ni(II)–Ln(III) complexes based on the Salen-type Schiff-base ligand

Cited by 21 publications

References 40 publications

Advances in heterometallic ring-opening (co)polymerisation catalysis

Advances in heterometallic ring-opening (co)polymerisation catalysis

Synthesis of Biodegradable Polymers: A Review on the Use of Schiff-Base Metal Complexes as Catalysts for the Ring Opening Polymerization (ROP) of Cyclic Esters

Use of Micro- and Nano-ZnO particles as Catalysts for the Microwave-Assisted Polymerization ofD,L-lactide

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