Bis(phenyl-β-diketonato)titanium(IV) ethoxide complexes: ring-opening polymerization of L-lactide by solvent-free microwave irradiation

Polyhedron ◽  
2021 ◽  
pp. 115520
Author(s):  
Rianne M. Lord ◽  
Felix D. Janeway ◽  
Laura Bird ◽  
Patrick C. McGowan
Keyword(s):  
Microwave Irradiation ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Solvent Free

Kinetic Modeling of Ring Opening Polymerization of Lactones Under Microwave Irradiation

2021 ◽  
pp. 2100044
Author(s):  
Porfirio López‐Domínguez ◽  
Nathalie Michelle Carranco‐Hernández ◽  
Eduardo Vivaldo‐Lima
Keyword(s):  
Microwave Irradiation ◽  
Kinetic Modeling ◽  
Ring Opening ◽  
Ring Opening Polymerization

Ring-Opening Polymerization of L-lactide Initiated by Samarium(III) Acetate

2019 ◽  
Vol 3 (2) ◽  
pp. 112-119
Author(s):  
Jesús Miguel Contreras Ramírez ◽  
Dimas Medina ◽  
Francisco López-Carrasquero ◽  
Ricardo Rafael Contreras
Keyword(s):  
1H Nmr ◽  
Ring Opening ◽  
Alkali Metals ◽  
Molar Mass ◽  
Ring Opening Polymerization ◽  
Solvent Free ◽  
Size Exclusion ◽  
Polymerization Process ◽  
Molar Ratio ◽  
Aliphatic Polyesters

Background: The synthesis of the aliphatic polyesters obtained by the ring opening polymerization has been achieved using as initiators a large amount of organometallic compounds derivative from: Alkali metals, alkaline earth metals, transition metals and lanthanide metals. Of all these compounds, the lanthanide derivatives have acquired great importance in the synthesis of aliphatic polyesters, since these show a greater catalytic activity and also can provide polymer with characteristics that will be very useful in the design of biomaterials. Objective: It was proposed the synthesis of poly(L-lactida) (PL-LA) through a ring opening polymerization process of L-lactide initiated with samarium(III) acetate (Sm(OAc)3) under solvent-free melt conditions. The influence of different parameters of reaction, such as temperature, time, molar ratio monomer to initiator, on typical variables of polymers, e.g., conversion, dispersity, and molar mass, were analyzed. Methods: All polymerizations were carried out under solvent-free melt conditions in ampoules-like flasks, equipped with a magnetic stirrer. The obtained polyesters were characterized by size exclusion chromatography (SEC) and 1H-NMR. Results: The Sm(OAc)3 induces the polymerization of L-LA at high conversion, and produce polyesters with number-average molecular weights of 1.00 x 103 to 30.00 x 103 Dalton. The 1H-NMR analysis indicates a typical polymerization mechanism of coordination-insertion, with a breakdown of the acyl-oxygen bond of the L-LA. Conclusion: Sm(OAc)3 was an effective initiator for the ring-opening polymerization of L-LA. SEC chromatography showed that, at high temperatures and prolonged reaction times, the molar mass of the polyester decreases, which is associated with the transesterification collateral reactions that occur during the polymerization process.

Organotin-bridged ionic liquid as a solvent-free, leaching-resistive catalyst for ring opening polymerization of ε-caprolactone

2019 ◽  
Vol 43 (15) ◽  
pp. 5872-5878 ◽  
Author(s):  
Asmaa Bouyahya ◽  
Sébastien Balieu ◽  
Redouane Beniazza ◽  
Mustapha Raihane ◽  
Abdelkrim El Kadib ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Solvent Free ◽  
Biologically Relevant ◽  
The Way

An easy synthesis provides a monoalkyltin trichloride grafted onto an ionic liquid. The catalyst paves the way to nontoxic biologically relevant materials.

Bulk solvent-free melt ring-opening polymerization of L-lactide catalyzed by Cu(II) and Cu(II)-Nd(III) complexes of the Salen-type Schiff-base ligand

2011 ◽  
Vol 25 (4) ◽  
pp. 310-316 ◽  
Author(s):  
Lei-Lei Chen ◽  
Li-Qin Ding ◽  
Chu Zeng ◽  
Yong Long ◽  
Xing-Qiang Lü ◽  
...  
Keyword(s):  
Schiff Base ◽  
Schiff Base Ligand ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Solvent Free

Coumarin salen-based zinc complex for solvent-free ring opening polymerization of ε-caprolactone

2017 ◽  
Vol 58 (10) ◽  
pp. 977-980 ◽  
Author(s):  
Nelson Nuñez-Dallos ◽  
Andrés F. Posada ◽  
John Hurtado
Keyword(s):  
Ring Opening ◽  
Zinc Complex ◽  
Ring Opening Polymerization ◽  
Solvent Free ◽  
Free Ring

scholarly journals 1-n-Butyl-3-methylimidazolium-2-carboxylate: a versatile precatalyst for the ring-opening polymerization of ε-caprolactone and rac-lactide under solvent-free conditions

2013 ◽  
Vol 9 ◽  
pp. 647-654 ◽  
Author(s):  
Astrid Hoppe ◽  
Faten Sadaka ◽  
Claire-Hélène Brachais ◽  
Gilles Boni ◽  
Jean-Pierre Couvercelle ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Ring Opening ◽  
Gel Permeation Chromatography ◽  
Ring Opening Polymerization ◽  
Solvent Free ◽  
Scanning Calorimetry ◽  
H Nmr ◽  
Solvent Free Conditions ◽  
Gel Permeation

The ring-opening polymerization of ε-caprolactone (ε-CL) and rac-lactide (rac-LA) under solvent-free conditions and using 1-n-butyl-3-methylimidazolium-2-carboxylate (BMIM-2-CO2) as precatalyst is described. Linear and star-branched polyesters were synthesized by successive use of benzyl alcohol, ethylene glycol, glycerol and pentaerythritol as initiator alcohols, and the products were fully characterized by 1H and 13C{1H} NMR spectroscopy, gel permeation chromatography (GPC), and differential scanning calorimetry (DSC). BMIM-2-CO2 acts as an N-heterocyclic carbene precursor, resulting from in situ decarboxylation, either by heating under vacuo (method A) or by addition of NaBPh4 (method B). Possible catalytic and deactivation mechanisms are proposed.

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