Journal ArticleDOI
Complexes of Mg, Ca and Zn as homogeneous catalysts for lactide polymerization.
TLDR
This Perspective is not intended as a comprehensive review, but rather a systematic highlight of key contributions, which have served to extend the forefront of this exciting field.Abstract:
Interest in the utility of polylactide as a commodity polymer has increased significantly in recent years due to numerous environmental advantages over conventional petrochemically derived plastics. As such, the development of novel catalyst systems for the ring opening polymerization of lactide has seen tremendous progress in the past decade. In particular, divalent metals (i.e.Mg, Ca and Zn) supported by monoanionic ancillary scaffolds are appealing because of their low toxicity and cost. A much less common approach involves the use of neutral ligands in combination with the aforementioned divalent metal centres. The additional valence thus renders it possible, upon reaction with traditional Lewis or Bronsted acid activators, to generate sterically and electronically unsaturated species, akin to the most widely employed olefin polymerization catalysts. This Perspective is not intended as a comprehensive review, but rather a systematic highlight of key contributions, which have served to extend the forefront of this exciting field.read more
Citations
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Highly active zinc catalyst for the controlled polymerization of lactide.
Laurie E. Breyfogle,Charlotte K. Williams,SK Choi,Wonwoo Nam,VG Young,Marc A. Hillmyer,William B. Tolman +6 more
TL;DR: In this paper, the authors reported the preparation, structural characterization, and detailed lactide polymerization behavior of a new Zn(II) alkoxide complex, (L(1)ZnOEt)(2) (L (1) = 2,4-di-tert-butyl-6-{[(2'-dimethylaminoethyl)methylamin]methyl}phenolate).
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Metal-catalyzed immortal ring-opening polymerization of lactones, lactides and cyclic carbonates.
Noureddine Ajellal,Jean-François Carpentier,Clémence Guillaume,Sophie M. Guillaume,Marion Helou,Valentin Poirier,Yann Sarazin,Alexander A. Trifonov +7 more
TL;DR: This Perspective article summarizes efforts paid in this group to develop efficient metal-based catalysts for the immortal ring-opening polymerization (iROP) of cyclic esters in the presence of large amounts of alcohols (ROH) as chain transfer agents.
Journal ArticleDOI
Discrete Cationic Complexes for Ring-Opening Polymerization Catalysis of Cyclic Esters and Epoxides
TL;DR: In view of the activated monomer mechanism that is often assocd.
Journal ArticleDOI
Hydrogen-bonding organocatalysts for ring-opening polymerization
Coralie Thomas,Brigitte Bibal +1 more
TL;DR: In this paper, the design of catalysts, strategies of activation and mechanistic elucidations are highlighted in the ring-opening polymerization of cyclic esters and carbonates, hydrogen-bonding organocatalysis offers an interesting alternative to metal-based and enzymatic catalysis to access biocompatible and biodegradable polymers.
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Versatile catalytic systems based on complexes of zinc, magnesium and calcium supported by a bulky bis(morpholinomethyl)phenoxy ligand for the large-scale immortal ring-opening polymerisation of cyclic esters.
TL;DR: A new heteroleptic ethyl-zinc complex stabilized by a chelating bis(morpholinomethyl)phenoxy ligand has been synthesised and shown to be a highly potent initiator for the immortal ring-opening polymerisation (ROP) of lactide and beta-butyrolactone.
References
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Journal ArticleDOI
Late-metal catalysts for ethylene homo- and copolymerization.
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Polylactic Acid Technology
TL;DR: Polylactic acid is proving to be a viable alternative to petrochemical-based plastics for many applications It is produced from renewable resources and is biodegradable, decomposing to give H2O, CO2, and humus, the black material in soil as mentioned in this paper.
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Stereospecific Olefin Polymerization with Chiral Metallocene Catalysts
TL;DR: In contrast to heterogeneous Ziegler-Natta catalysts, homogeneous metallocene-based catalysts as discussed by the authors allow efficient control of regio-and stereoregularities, molecular weights and molecular weight distributions, and comonomer incorporation.
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Advances in non-metallocene olefin polymerization catalysis.
TL;DR: The graph below shows the progression of monoanionic and non-monoanionic ligands through the history of synthesis, as well as some of the properties that have been identified since the discovery of R-Diimine.
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Biodegradable polyesters for medical and ecological applications
Yoshito Ikada,Hideto Tsuji +1 more
TL;DR: Classification, requirements, applications, physical properties, biodegradability, and degradation mechanisms of representative biodesgradable polymers that have already been commercialized or are under investigation are outlined.