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

2013; American Chemical Society; Volume: 46; Issue: 16 Linguagem: Inglês

10.1021/ma401216u

1520-5835

José A. Castro‐Osma, Carlos Alonso‐Moreno, Joaquín C. Garcı́a-Martı́nez, Juan Fernández‐Baeza, Luis F. Sánchez‐Barba, Agustín Lara‐Sánchez, Antonío Otero,

Carbon dioxide utilization in catalysis

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.