Group 2 Metal Complexes Based on Redox-Active Acenaphthene-1,2-Diimine Ligand for the Polymerization of L-Lactide

Morozov, A. G.; Markelova, Ekaterina; Fedyushkin, I. L.

doi:10.1134/s1070427218060253

Cited by 14 publications

(7 citation statements)

References 25 publications

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“…This PLA is obtained by ring‐opening polymerization rac ‐lactide in the presence of a calcium acenaphthylene‐1,2‐bisamide complex as a catalyst. [ 24 ] In contrast to isotactic poly‐ l ‐lactide, the resulting polymer has an atactic structure, which provides a lower glass transition temperature (50.1 °C). Poly‐EGDMA plates were immersed in dioxane solutions of the prepared PLA.…”

Section: Resultsmentioning

confidence: 99%

Porous Polymer Scaffolds based on Cross‐Linked Poly‐EGDMA and PLA: Manufacture, Antibiotics Encapsulation, and In Vitro Study

Чесноков

Aleynik

Kovylin

et al. 2021

Macromolecular Bioscience

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Porous polymer materials derived from poly(ethylene glycol dimethacrylate) (poly‐EGDMA) and antibiotic containing polylactide (PLA) are obtained for the first time. Porous poly‐EGDMA monoliths with a system of open interconnected pores are synthesized by a visible light‐induced radical polymerization of EGDMA in the presence of 70 wt% of porogenic agent, e.g., 1‐butanol, 1‐hexanol, 1‐octanol, or cyclohexanol. The porosity of the obtained polymers is 75–78%. A modal pore size depends on the nature of the porogen and varies from 0.5 µm (cyclohexanol) to 12 µm (1‐butanol). The polymer matrix made with 1‐butanol features the presence of pores ranging from 1 to 100 µm. The pore surface of poly‐EGDMA matrices is inlayered with poly‐D,L‐lactide (Mn 23 × 103 Da, PDI 1.31). The PLA‐modified poly‐EGDMA retains a porous structure that is similar to the initial poly‐EGDMA but with improved strength characteristics. The presence of antibiotic containing PLA ensures a high and continuous antibacterial activity of the hybrid polymeric material for 7 days. The nontoxicity of all the porous matrices studied makes them promising for clinical tests as osteoplastic materials.

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Section: Resultsmentioning

confidence: 99%

Porous Polymer Scaffolds based on Cross‐Linked Poly‐EGDMA and PLA: Manufacture, Antibiotics Encapsulation, and In Vitro Study

Чесноков

Aleynik

Kovylin

et al. 2021

Macromolecular Bioscience

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“…The activity of complex 1 in solution turned out to be comparable to that of the known calcium complexes which are active in the ROP processes [3a,b,d–i] . However, in the melt compound 1 is inferior in terms of molecular weight [3g] .…”

Section: Resultsmentioning

confidence: 77%

“…The reaction mechanism has been studied earlier [3e] . According to this study, the polymerization is initiated by the formation of a biradical cycloadduct of calcium complexes with an L‐lactide molecule.…”

Section: Resultsmentioning

confidence: 99%

Calcium Complexes Bearing Dianionic or Monoanionic Iminoacenaphthen‐1‐one Ligands: Synthesis, Reactions with Alkynes and Catalysis of L‐lactide Polymerization

et al. 2022

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The reduction of 2- [(2,6-diisopropylphenyl)imino]acenaphthen-1-one (dpp-MIAN) with metallic calcium in THF affords tetrameric [(dpp-MIAN)Ca(THF)] 4 (1). A further addition of dpp-MIAN to complex 1 leads to the formation of paramagnetic species [(dpp-MIAN) 3 Ca] 2 Ca (2). Both complexes were characterized by X-ray diffraction. Complex 1 is active towards phenylacetylene and acetylene at temperatures above 80 °C. As a result, cycloaddition products are formed. Their hydrolysis results in a release of the dpp-MIAN ligand with an attached phenylethynyl or ethynyl moiety to the carbonyl C atom. Complexes 1 and 2 demonstrate catalytic activity in the polymerization of L-lactide both in solution and in bulk.

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“…hydrogen peroxide (see supporting information) 64 . PLA was obtained by ROP of l ‐lactide in the presence of (dpp‐bian) 2 Ca 65 . Details of the synthesis are given in the supporting information.…”

Section: Methodsmentioning

confidence: 99%

“…64 PLA was obtained by ROP of L-lactide in the presence of (dpp-bian) 2 Ca. 65 Details of the synthesis are given in the supporting information. The measurements were performed in a standard aluminium crucible with a punctured cover.…”

Section: Experimental Materialsmentioning

confidence: 99%

New method for controlled synthesis of polylactide block copolymers: organoborane/p‐quinone system and reversible‐deactivation radical polymerization

Ludin

Зайцев

Маркин

et al. 2021

Polymer International

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We developed a new approach to obtain polylactide hybrid block copolymers with vinyl monomers (styrene, methyl methacrylate, methyl acrylate) through the realization of a reaction sequence using triethylborane and various p-quinones. The method offered includes two stages. In the first stage, a chain-transfer agent was obtained by borylation of the terminal hydroxyl groups of polylactide. The second stage was vinyl monomer radical polymerization in the presence of p-quinone accompanied by S H 2-substitution at the boron atom.1,4-Naphthoquinone, 2,3-dimethyl-1,4-benzoquinone, duroquinone and 2,5-di-tert-butyl-1,4-benzoquinone were used as synthetic polymer chain growth mediators. It is shown that 1,4-naphthoquinone and 2,3-dimethyl-1,4-benzoquinone, similar in their characteristics, are effective agents providing the realization of reversibledeactivation radical polymerization. Realization of reversible-deactivation radical polymerization was proved with the analysis of the kinetics of block copolymerization, molecular weight characteristics and compositional homogeneity of block copolymers as well as its further capability to elongate the polymer chain. Synthesized block copolymers have a high thermal stability compared to the initial borylated polylactide.

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Group 2 Metal Complexes Based on Redox-Active Acenaphthene-1,2-Diimine Ligand for the Polymerization of L-Lactide

Cited by 14 publications

References 25 publications

Porous Polymer Scaffolds based on Cross‐Linked Poly‐EGDMA and PLA: Manufacture, Antibiotics Encapsulation, and In Vitro Study

Porous Polymer Scaffolds based on Cross‐Linked Poly‐EGDMA and PLA: Manufacture, Antibiotics Encapsulation, and In Vitro Study

Calcium Complexes Bearing Dianionic or Monoanionic Iminoacenaphthen‐1‐one Ligands: Synthesis, Reactions with Alkynes and Catalysis of L‐lactide Polymerization

New method for controlled synthesis of polylactide block copolymers: organoborane/p‐quinone system and reversible‐deactivation radical polymerization

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