scholarly journals Efficient Diethylzinc/Gallic Acid and Diethylzinc/Gallic Acid Ester Catalytic Systems for the Ring-Opening Polymerization of rac-Lactide

Molecules ◽  
2015 ◽  
Vol 20 (12) ◽  
pp. 21909-21923 ◽  
Author(s):  
Karolina Żółtowska ◽  
Urszula Piotrowska ◽  
Ewa Oledzka ◽  
Marcin Sobczak
Keyword(s):  
Gallic Acid ◽  
Acid Ester ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Catalytic Systems

scholarly journals Novel Zinc-Catalytic Systems for Ring-Opening Polymerization of ε-Caprolactone

Molecules ◽  
2015 ◽  
Vol 20 (2) ◽  
pp. 2816-2827 ◽  
Author(s):  
Karolina Żółtowska ◽  
Marcin Sobczak ◽  
Ewa Olędzka
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Catalytic Systems

Macrocycles in dual role: ancillary ligands in metal complexes and organocatalysts for the ring-opening polymerization of lactide

2021 ◽  
Author(s):  
Sourav Singha Roy ◽  
Sriparna Sarkar ◽  
Debashis Chakraborty
Keyword(s):  
Molecular Weight ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
First Century ◽  
Environmentally Benign ◽  
Catalytic Systems ◽  
Ancillary Ligands ◽  
Central Focus ◽  
Polymer Research ◽  
Review Reports

AbstractIn the twenty-first century, one of the central focus of polymer research in academia and industries is directed towards the design of environmentally-benign materials produced from reagents that have minimal deleterious effects on our environment. The aliphatic polyester PLA is one such example. Due to its biodegradable, biorenewable and biocompatible nature, PLA finds diverse applications, especially in the biomedical field. PLA is exclusively synthesized by the ring-opening polymerization of lactide (cyclic dimer of lactic acid) in the presence of a catalyst. The macrocycles and macrocyclic metal moieties can act as effective catalysts for the polymerization resulting in the formation of PLA with controlled tacticity and predetermined molecular weight. This review reports metal-based catalytic systems supported by porphyrin, calixarene and bispyrrolidine- salan as ancillary ligand and metal-free organocatalyst sparteine for the ROP of LA. The variation in catalytic activity, tacticity of PLA, and PLA's molecular weight distribution by substitutional changes in the catalyst framework have been discussed in detail. Graphic abstract

scholarly journals Bis[μ-bis(2,6-diisopropylphenyl) phosphato-κ2 O:O′]bis[(2,2′-bipyridine-κ2 N,N′)lithium] toluene disolvate and its catalytic activity in ring-opening polymerization of ∊-caprolactone and L-dilactide

2019 ◽  
Vol 75 (6) ◽  
pp. 848-853
Author(s):  
Alexey E. Kalugin ◽  
Pavel D. Komarov ◽  
Mikhail E. Minyaev ◽  
Konstantin A. Lyssenko ◽  
Dmitrii M. Roitershtein ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Ring Opening ◽  
Coordination Mode ◽  
Complex Molecule ◽  
Ring Opening Polymerization ◽  
Title Complex ◽  
Asymmetric Unit ◽  
Isopropyl Group ◽  
Catalytic Systems ◽  
Phosphate Ligand

The solvated centrosymmmtric title compound, [Li2(C24H34O4P)2(C10H8N2)2]·2C7H8, was formed in the reaction between {Li[(2,6-iPr2C6H3-O)2POO](MeOH)3}(MeOH) and 2,2′-bipyridine (bipy) in toluene. The structure has monoclinic (P21/n) symmetry at 120 K and the asymmetric unit consists of half a complex molecule and one molecule of toluene solvent. The diaryl phosphate ligand demonstrates a μ-κO:κO′-bridging coordination mode and the 2,2′-bipyridine ligand is chelating to the Li+ cation, generating a distorted tetrahedral LiN2O2 coordination polyhedron. The complex exhibits a unique dimeric Li2O4P2 core. One isopropyl group is disordered over two orientations in a 0.621 (4):0.379 (4) ratio. In the crystal, weak C—H...O and C—H...π interactions help to consolidate the packing. Catalytic systems based on the title complex and on the closely related complex {Li[(2,6-iPr2C6H3-O)2POO](MeOH)3}(MeOH) display activity in the ring-opening polymerization of ∊-caprolactone and L-dilactide.

Cyclo-olefin ring-opening polymerization by tungsten chloride-allylsilane catalytic systems

1977 ◽  
Vol 13 (6) ◽  
pp. 447-450 ◽  
Author(s):  
I.A. Oreshkin ◽  
L.I. Redkina ◽  
I.L. Kershenbaum ◽  
G.M. Chernenko ◽  
K.L. Makovetsky ◽  
...  
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Catalytic Systems ◽  
Tungsten Chloride

Heterogeneous catalysts based on built-in N-heterocyclic carbenes with high removability, recoverability and reusability for ring-opening polymerization of cyclic esters

2019 ◽  
Vol 10 (12) ◽  
pp. 1526-1536 ◽  
Author(s):  
Wen Liu ◽  
Guo-Qiang Tian ◽  
Dan-Dan Yang ◽  
Gang Wu ◽  
Si-Chong Chen ◽  
...  
Keyword(s):  
Ring Opening ◽  
Heterogeneous Catalysts ◽  
Ring Opening Polymerization ◽  
Heterocyclic Carbenes ◽  
Catalytic Systems ◽  
Cyclic Esters ◽  
Metal Free ◽  
Critical Issues ◽  
New Generation

Both activity and reusability are critical issues for developing new generation metal-free catalytic systems.

Ring-opening polymerization of lactones using zirconocene catalytic systems: Block copolymerization with methyl methacrylate

2007 ◽  
Vol 45 (16) ◽  
pp. 3524-3537 ◽  
Author(s):  
Konstantinos Kostakis ◽  
Stylianos Mourmouris ◽  
Giorgos Karanikolopoulos ◽  
Marinos Pitsikalis ◽  
Nikos Hadjichristidis
Keyword(s):  
Methyl Methacrylate ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Block Copolymerization ◽  
Catalytic Systems

A Recommender System for Inverse Design of Polycarbonates and Polyesters

2020 ◽  
Author(s):  
Nathaniel Park ◽  
Dmitry Yu. Zubarev ◽  
James L. Hedrick ◽  
Vivien Kiyek ◽  
Christiaan Corbet ◽  
...  
Keyword(s):  
Ring Opening ◽  
High Performance ◽  
Recommendation System ◽  
Polymeric Materials ◽  
Monomer Conversion ◽  
Design Strategy ◽  
Ring Opening Polymerization ◽  
Inverse Design ◽  
False Negatives ◽  
Accelerate Development

The convergence of artificial intelligence and machine learning with material science holds significant promise to rapidly accelerate development timelines of new high-performance polymeric materials. Within this context, we report an inverse design strategy for polycarbonate and polyester discovery based on a recommendation system that proposes polymerization experiments that are likely to produce materials with targeted properties. Following recommendations of the system driven by the historical ring-opening polymerization results, we carried out experiments targeting specific ranges of monomer conversion and dispersity of the polymers obtained from cyclic lactones and carbonates. The results of the experiments were in close agreement with the recommendation targets with few false negatives or positives obtained for each class.<br>

Bisurea and Bisthiourea H-Bonding Organocatalysts for Ring-Opening Polymerization: Cues for the Catalyst Design

2019 ◽  
Vol 52 (23) ◽  
pp. 9232-9237 ◽  
Author(s):  
Rukshika S. Hewawasam ◽  
U. L. D. Inush Kalana ◽  
Nayanthara U. Dharmaratne ◽  
Thomas J. Wright ◽  
Timothy J. Bannin ◽  
...  
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Catalyst Design
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