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 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.

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 Synthesis of aluminum complexes supported by 2-(1,10-phenanthrolin-2-yl)phenolate ligands and their catalysis in the ring-opening polymerization of cyclic esters

RSC Advances ◽  
2017 ◽  
Vol 7 (44) ◽  
pp. 27177-27188 ◽  
Author(s):  
Xiang-Xin Zheng ◽  
Zhong-Xia Wang
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Block Copolymerization ◽  
Cyclic Esters ◽  
Aluminum Complexes ◽  
Phenolate Ligands

Phenanthroline-phenolate based N,N,O-chelate aluminum complexes were demonstrated to catalyze the ROP of ε-caprolactone, rac-lactide, and rac-β-butyrolactone, as well as their block copolymerization.

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>

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