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Polymers 2018, 10(11), 1239; https://doi.org/10.3390/polym10111239

Polymers of ε-Caprolactone Using New Copper(II) and Zinc(II) Complexes as Initiators: Synthesis, Characterization and X-Ray Crystal Structures

1
Departamento de Química, Universidad de los Andes, Carrera 1 No. 18A-12, Bogotá 111711, Colombia
2
Grupo de Macromoléculas, Departamento de Química, Universidad Nacional de Colombia, Carrera 45 No 26–85, edificio 451 of. 449, 11001, Bogotá, Colombia
*
Author to whom correspondence should be addressed.
Received: 25 September 2018 / Revised: 2 November 2018 / Accepted: 5 November 2018 / Published: 8 November 2018
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Abstract

Five of six new Zn(II) and Cu(II) complexes were active in the ring-opening polymerization (ROP) of ε-caprolactone (CL) under solvent-free conditions, producing polycaprolactones (PCLs) of high crystallinity with molecular weights between 22,900 and 38,700 g mol−1 and decomposition temperatures above 260 °C. 1H NMR analysis demonstrated that the PCLs obtained were mainly linear, having hydroxymethylene groups at the chain ends. The results obtained indicated a significant improvement in terms of the ratio of monomer:initiator compared to related Cu(II) and Zn(II) complexes. In addition, the structures of the complexes 1 and 4 were determined by single-crystal X-ray diffraction. The synthesis and full characterization of all complexes are described in this paper. View Full-Text
Keywords: ring-opening polymerization; ε-caprolactone; bis(3,5-dimethylpyrazole) ligands; zinc(II) and copper(II) complexes; crystal structures ring-opening polymerization; ε-caprolactone; bis(3,5-dimethylpyrazole) ligands; zinc(II) and copper(II) complexes; crystal structures
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Posada, A.F.; Macías, M.A.; Movilla, S.; Miscione, G.P.; Pérez, L.D.; Hurtado, J.J. Polymers of ε-Caprolactone Using New Copper(II) and Zinc(II) Complexes as Initiators: Synthesis, Characterization and X-Ray Crystal Structures. Polymers 2018, 10, 1239.

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