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

scholarly journals Synthesis and crossover reaction of TEMPO containing block copolymer via ROMP

2010 ◽  
Vol 6 ◽  
Author(s):  
Olubummo Adekunle ◽  
Susanne Tanner ◽  
Wolfgang H Binder
Keyword(s):  
Dicarboxylic Acid ◽  
Ring Opening ◽  
Laser Desorption ◽  
Ring Opening Polymerization ◽  
Ionization Mass ◽  
Laser Desorption Ionization ◽  
Block Copolymerization ◽  
Molecular Weights ◽  
Ionization Mass Spectroscopy ◽  
Rate Of Polymerization

We report on the block copolymerization of two structurally different norbornene monomers (±)-endo,exo-bicyclo[2.2.1]-hept-5-ene-2,3-dicarboxylic acid dimethylester (7), and (±)-endo,exo-bicyclo[2.2.1]-hept-5-ene-2,3-dicarboxylic acid bis(1-oxyl-2,2,6,6-tetramethyl-piperidin-4-yl) ester (9) using ruthenium based Grubbs’ type initiators [(PCy3)2Cl2Ru(benzylidene)] G1 (PCy3 = tricyclohexylphosphine), [(H2IMes)(PCy3)Cl2Ru(benzylidene)] G2 (H2IMes = 1,3-bis(mesityl)-2-imidazolidinylidene), [(H2IMes)(py)2Cl2Ru(benzylidene)] G3 (py = pyridine or 3-bromopyridine) and Umicore type initiators [(PCy3)2Cl2Ru(3-phenylinden-1-ylidene)] U1 (PCy3 = tricyclohexylphosphine), [(H2IMes)(PCy3)Cl2Ru(3-phenylinden-1-ylidene)] U2 (H2IMes = 1,3-bis(mesityl)-2-imidazolidinylidene), [(H2IMes)(py)Cl2Ru(3-phenylinden-1-ylidene)] U3 (py = pyridine or 3-bromopyridine) via ring opening polymerization (ROMP). The crossover reaction and the polymerization kinetics were investigated using matrix assisted laser desorption ionization mass spectroscopy (MALDI-TOF) and nuclear magnetic resonance (NMR), respectively. MALDI showed that there was a complete crossover reaction after the addition of 25 equivalents of the second monomer. NMR investigation showed that U3 gave a faster rate of polymerization in comparison to U1. The synthesis of block copolymers with molecular weights up to M n = 31 000 g/mol with low polydispersities (M w/M n = 1.2) is reported.

Ring-opening polymerization and block copolymerization ofL-lactide with divalent samarocene complex

2003 ◽  
Vol 41 (17) ◽  
pp. 2667-2675 ◽  
Author(s):  
Dongmei Cui ◽  
Tao Tang ◽  
Wuguo Bi ◽  
Jianhua Cheng ◽  
Wenqi Chen ◽  
...  
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Block Copolymerization

scholarly journals Metal-free catalyzed ring-opening polymerization and block copolymerization of ω-pentadecalactone using amino-ended initiators

2018 ◽  
Vol 108 ◽  
pp. 380-389 ◽  
Author(s):  
E. Tinajero-Díaz ◽  
A. Martínez-de Ilarduya ◽  
S. Muñoz-Guerra ◽  
M.-V. de-Paz ◽  
Elsa Galbis
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Block Copolymerization ◽  
Metal Free

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

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

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.

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