Ring-Opening (ROP) versus Ring-Expansion (REP) Polymerization of ε‑Caprolactone To Give Linear or Cyclic Polycaprolactones

Macromolecular engineering of cyclic polycaprolactones has been carried out by a ring-expansion procedure catalyzed by a series of alkyl-organoaluminum initiators. The single-site nature of the initiators allows a very well-controlled macrolactonization process to give moderate to high molecular wei...

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Bibliographic Details
Published in:Macromolecules 2013-08, Vol.46 (16), p.6388-6394
Main Authors: Castro-Osma, José A, Alonso-Moreno, Carlos, García-Martinez, Joaquín C, Fernández-Baeza, Juan, Sánchez-Barba, Luis F, Lara-Sánchez, Agustín, Otero, Antonio
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Polymerization
Preparation, kinetics, thermodynamics, mechanism and catalysts
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Summary:Macromolecular engineering of cyclic polycaprolactones has been carried out by a ring-expansion procedure catalyzed by a series of alkyl-organoaluminum initiators. The single-site nature of the initiators allows a very well-controlled macrolactonization process to give moderate to high molecular weight cyclic polymers with narrow polydispersities. Cyclic architectures are supported by a combination of techniques such as viscosity measurements, NMR, and MALDI-TOF MS analysis.
ISSN:0024-9297
1520-5835
DOI:10.1021/ma401216u