Molecular Design of Single-Site Metal Alkoxide Catalyst Precursors for Ring-Opening Polymerization Reactions Leading to Polyoxygenates. 1. Polylactide Formation by Achiral and Chiral Magnesium and Zinc Alkoxides, (η3-L)MOR, Where L = Trispyrazolyl- and Trisindazolylborate Ligands

2000 ◽  
Vol 122 (48) ◽  
pp. 11845-11854 ◽  
Author(s):  
Malcolm H. Chisholm ◽  
Nancy W. Eilerts ◽  
John C. Huffman ◽  
Suri S. Iyer ◽  
Martha Pacold ◽  
...  
Keyword(s):  
Ring Opening ◽  
Molecular Design ◽  
Ring Opening Polymerization ◽  
Single Site ◽  
Metal Alkoxide

Single-Site Calcium Initiators for the Controlled Ring-Opening Polymerization of Lactides and Lactones

2003 ◽  
Vol 51 (3) ◽  
pp. 175-182 ◽  
Author(s):  
Zhiyuan Zhong ◽  
Stefan Schneiderbauer ◽  
Pieter J. Dijkstra ◽  
Matthias Westerhausen ◽  
Jan Feijen
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Single Site

Single site catalysts for stereoselective ring-opening polymerization of lactides

2011 ◽  
Vol 2 (3) ◽  
pp. 520-527 ◽  
Author(s):  
Pieter Jelle Dijkstra ◽  
Hongzhi Du ◽  
Jan Feijen
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Single Site ◽  
Single Site Catalysts

Initiation of ring-opening polymerization of lactide: The effect of metal alkoxide catalyst

2012 ◽  
Vol 995 ◽  
pp. 8-16 ◽  
Author(s):  
Diana Cheshmedzhieva ◽  
Iva Angelova ◽  
Sonia Ilieva ◽  
George S. Georgiev ◽  
Boris Galabov
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Metal Alkoxide

Synthesis and characterization of group 4 metal alkoxide complexes containing imine based bis-bidentate ligands: effective catalysts for the ring opening polymerization of lactides, epoxides and polymerization of ethylene

2015 ◽  
Vol 44 (22) ◽  
pp. 10352-10367 ◽  
Author(s):  
Sagnik K. Roymuhury ◽  
Debashis Chakraborty ◽  
Venkatachalam Ramkumar
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Synthesis And Characterization ◽  
Metal Alkoxide ◽  
Bidentate Ligands ◽  
Group 4 ◽  
Group 4 Metal

A series of group 4 complexes containing imine based bis-bidentate ligands were synthesized and used as catalysts for various polymerizations.

Concerning the ring-opening polymerization of lactide and cyclic esters by coordination metal catalysts

2010 ◽  
Vol 82 (8) ◽  
pp. 1647-1662 ◽  
Author(s):  
Malcolm H. Chisholm
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Solvent Free ◽  
Single Site ◽  
Active Group ◽  
Cyclic Esters ◽  
Highly Active ◽  
Group 2 ◽  
Single Site Catalysts ◽  
Competing Reactions

A summary of the reactions involved in the ring-opening polymerization (ROP) of lactide (LA) to give polylactides (PLAs) is presented along with competing reactions. Particular attention is given to the stereoselective polymerization of rac-LA to give heterotactic PLA and meso-LA to give syndiotactic PLA by aluminum Schiff-based catalysts and to the development of highly active group 2 metal single-site catalysts. Melt or solvent-free polymerization is also described along with reactions that lead exclusively to cyclic-polylactides.

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