Thermo-enhanced ring-opening polymerization of ε-caprolactone: the synthesis, characterization, and catalytic behavior of aluminum hydroquinolin-8-olates

2017 ◽  
Vol 46 (24) ◽  
pp. 7833-7843 ◽  
Author(s):  
Qiurui Zhang ◽  
Wenjuan Zhang ◽  
Natesan Mannangatti Rajendran ◽  
Tongling Liang ◽  
Wen-Hua Sun
Keyword(s):  
High Temperatures ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Catalytic Behavior ◽  
Ambient Temperatures

Aluminum hydroquinolin-8-olates (C1–C7) exhibited high activities for the ring-opening polymerization of ε-CL at high temperatures in the presence of BnOH, but quite low activities at ambient temperatures.

Synthesis of Rare Earth Catalyst LLa[N(TMS)2]•DME(L=3,5-But2-2-HO-C6H2CH-NH-C5H4N) and Catalytic Behavior for Polymerization of Rac-Lactide

2012 ◽  
Vol 184-185 ◽  
pp. 1302-1306
Author(s):  
Xi Zhu ◽  
Yao Rong Wang
Keyword(s):  
Rare Earth ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Molar Ratio ◽  
Elimination Reaction ◽  
Catalytic Behavior ◽  
Rare Earth Catalyst

A dianionic phenoxyamido ligand was the first to be used to stabilize organo-rare-earth mental amido complex. Amine elimination reaction of La[N(SiMe3)2]3(THF)2 with 3,5-But2-2-HO-C6H2CH-NH-C5H4N in a 1 : 1 molar-ratio gave the anionic phenoxyamido neodymium amide LLa[N(TMS)2]•DME (1) in a high isolated yield. Furthemore, the catalytic behavior of complex 1 for the ring-opening polymerization of rac-lactide was explored.

A tetranuclear Sn(IV) 4-thiazolecarboxylate complex: synthesis, structure and catalytic behavior in the bulk ring-opening polymerization of glycolide

2016 ◽  
Vol 71 (8) ◽  
pp. 843-848 ◽  
Author(s):  
Jian Gao ◽  
Yu Yuan ◽  
Ai-Jun Cui ◽  
Feng Tian ◽  
Ming-Yang He ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Single Crystal ◽  
Ring Opening ◽  
Glycolic Acid ◽  
Average Molecular Weight ◽  
Ring Opening Polymerization ◽  
Number Average Molecular Weight ◽  
X Ray Diffraction ◽  
Catalytic Behavior ◽  
X Ray

AbstractThe reaction of 4-thiazolecarboxylic acid (Htzc) and dimethyltin(IV) dichloride with NaOH in mixed MeOH-H2O solvent led to the formation of a new Sn(IV) complex (Me2Sn)4(μ3-O)2(tzc)4 (1). Its structure has been characterized by elemental analysis, IR spectroscopy and single crystal and powder X-ray diffraction. Single-crystal X-ray diffraction revealed that complex 1 crystallizes in the monoclinic P21/c space group with Z = 2 and has a tetranuclear structure with crystallographically imposed centrosymmetry. The as-synthesized complex 1 was found to be active toward the bulk solvent-free polymerization of glycolide, producing poly(glycolic acid) with a number-average molecular weight up to 55.5 kDa.

scholarly journals Mono-BHT heteroleptic magnesium complexes: synthesis, molecular structure and catalytic behavior in the ring-opening polymerization of cyclic esters

2017 ◽  
Vol 46 (36) ◽  
pp. 12132-12146 ◽  
Author(s):  
I. E. Nifant'ev ◽  
A. V. Shlyakhtin ◽  
V. V. Bagrov ◽  
M. E. Minyaev ◽  
A. V. Churakov ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Catalytic Behavior ◽  
Cyclic Esters ◽  
Magnesium Complexes

Dimeric BHT-alkoxy magnesium complexes are able to catalyze ROP of lactones and lactides by the binuclear mechanism.

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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