scholarly journals Heterometallic cooperativity in divalent metal ProPhenol catalysts: combining zinc with magnesium or calcium for cyclic ester ring-opening polymerisation

2021 ◽  
Author(s):  
Weronika Gruszka ◽  
Haopeng Sha ◽  
Antoine Buchard ◽  
Jennifer A. Garden
Keyword(s):  
Ring Opening ◽  
Divalent Metal ◽  
Cyclic Ester ◽  
Lewis Acidity ◽  
Divalent Metals

The first heterobimetallic lactide ROP catalysts based on two divalent metals outperform the homobimetallic analogues, attributed to the increased Lewis acidity of Mg or Ca (monomer coordination) and enhanced polarity of Zn–Et/OR (propagation).

Chirality-Induced Catalyst Aggregation: Insights into Catalyst Speciation and Activity Using Chiral Aluminum Catalysts in Cyclic Ester Ring-Opening Polymerization

ACS Catalysis ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 4084-4093
Author(s):  
Sami Gesslbauer ◽  
George Hutchinson ◽  
Andrew J. P. White ◽  
Jordi Burés ◽  
Charles Romain
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Cyclic Ester

Novel Biodegradable Polyurethane Foams Synthesized via Ring-Opening Oligomerization of Ethylene Carbonate Initiated / Catalyzed by Propylene Glycol / [bmim]Cl-(SnCl2) System

2010 ◽  
Vol 146-147 ◽  
pp. 1451-1457
Author(s):  
Jian Cheng Zhou ◽  
Ling Cheng ◽  
Dong Fang Wu
Keyword(s):  
Propylene Glycol ◽  
Ring Opening ◽  
Ethylene Carbonate ◽  
Polyurethane Foams ◽  
Lewis Acidity ◽  
Soil Burial ◽  
Molecular Weights ◽  
Chain Cleavage ◽  
Biodegradable Polyurethane ◽  
Catalytic Performances

Poly ether-carbonate diols were synthesized by ring-opening oligomerization of ethylene carbonate (EC) initiated/catalyzed by propylene glycol/[bmim]Cl-(SnCl2) system. It was shown that the oligomerization was accompanied with decarboxylation and chain cleavage. The stronger the lewis acidity of ionic liquid, the better the catalytic performances. The biogradability of the polyurethane foams which was prepared by poly ether-carbonate diols (or common polyether polyos ZS-4110) and diphenylmethane diisocyanate (MDI) was determined by soil burial and found to be influenced by the content of carbonate unit, molecular weights and the hydroxyl value of polyols respectively. Poly ether-carbonate diols can reduce the amount of MDI in synthesis of polyurethane foams.

scholarly journals Synthesis and structural characterization of transition metal dithiolene derivatives containing divalent metals as counter-cations

CrystEngComm ◽  
2019 ◽  
Vol 21 (9) ◽  
pp. 1423-1432 ◽  
Author(s):  
Oscar Castillo ◽  
Esther Delgado ◽  
Diego Hernández ◽  
Elisa Hernández ◽  
Avelino Martín ◽  
...  
Keyword(s):  
Coordination Polymer ◽  
Transition Metal ◽  
Structural Characterization ◽  
Metal Cations ◽  
Magnetic Behaviour ◽  
Divalent Metal ◽  
Divalent Metals ◽  
Divalent Metal Cations ◽  
1D Coordination Polymer

Complexes containing [Fe2(SC6H2Cl2S)4]2− or [Ni(SC6H2Cl2S)2]− entities and divalent metal cations as well as an 1D-coordination polymer K/Zn have been obtained and their magnetic behaviour studied.

Organophosphate-catalyzed bulk ring-opening polymerization as an environmentally benign route leading to block copolyesters, end-functionalized polyesters, and polyester-based polyurethane

2015 ◽  
Vol 6 (24) ◽  
pp. 4374-4384 ◽  
Author(s):  
Tatsuya Saito ◽  
Yusuke Aizawa ◽  
Kenji Tajima ◽  
Takuya Isono ◽  
Toshifumi Satoh
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Cyclic Carbonate ◽  
Environmentally Benign ◽  
Cyclic Ester ◽  
Cyclic Esters

To expand the potential of an organophosphate catalyst, ring-opening polymerization of cyclic esters, cyclic ester-ether, and cyclic carbonate was demonstrated under bulk conditions.

Role of the Divalent Metal Ion in Sugar Binding, Ring Opening, and Isomerization by D-Xylose Isomerase: Replacement of a Catalytic Metal by an Amino Acid

Biochemistry ◽  
1994 ◽  
Vol 33 (6) ◽  
pp. 1488-1494 ◽  
Author(s):  
Karen N. Allen ◽  
Arnon Lavie ◽  
Arthur Glasfeld ◽  
Timothy N. Tanada ◽  
Daniel P. Gerrity ◽  
...  
Keyword(s):  
Amino Acid ◽  
Ring Opening ◽  
Metal Ion ◽  
Xylose Isomerase ◽  
Divalent Metal ◽  
Sugar Binding ◽  
Divalent Metal Ion ◽  
Catalytic Metal

Tripodal hydrogen bond donor binding with sulfonic acid enables ring-opening polymerization

2016 ◽  
Vol 7 (7) ◽  
pp. 1368-1374 ◽  
Author(s):  
Xiaopei Li ◽  
Qiguo Zhang ◽  
Zhenjiang Li ◽  
Songquan Xu ◽  
Chengxu Zhao ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
Ring Opening ◽  
Sulfonic Acid ◽  
Ring Opening Polymerization ◽  
Cyclic Ester ◽  
Cyclic Carbonates ◽  
Hydrogen Bond Donor ◽  
Acidic Catalysis

The first Brønsted acidic catalysis platform workable in all of the three major types of cyclic ester monomers including lactides, cyclic carbonates, and lactones, is described in this paper.

Yttrium and aluminium complexes bearing dithiodiolate ligands: synthesis and application in cyclic ester polymerization

2015 ◽  
Vol 44 (41) ◽  
pp. 17990-18000 ◽  
Author(s):  
A. Meduri ◽  
M. Cozzolino ◽  
S. Milione ◽  
K. Press ◽  
E. Sergeeva ◽  
...  
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Cyclic Ester ◽  
Catalytic Activities

Yttrium and aluminium complexes of two dithiodiolate ligands that feature different bridges were synthesized and characterized. The catalytic activities of the four complexes in the ring-opening polymerization of ε-caprolactone and rac-lactide have been investigated.

scholarly journals Ethylene carbonate/cyclic ester random copolymers synthesized by ring-opening polymerization

2015 ◽  
Vol 6 (11) ◽  
pp. 1972-1985 ◽  
Author(s):  
William Guerin ◽  
Marion Helou ◽  
Martine Slawinski ◽  
Jean-Michel Brusson ◽  
Jean-François Carpentier ◽  
...  
Keyword(s):  
Ring Opening ◽  
Ethylene Carbonate ◽  
Ring Opening Polymerization ◽  
Cyclic Ester ◽  
Random Copolymers ◽  
Cyclic Esters

The successful ring-opening copolymerization of ethylene carbonate (EC) with various cyclic esters such as β-butyrolactone (BL), δ-valerolactone (VL), ε-caprolactone (CL) orl-lactide (LLA) has been achieved.

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