(AGENPARL) – LONDON (UNITED KINGDOM), ven 18 settembre 2020
Aliphatic polyesters are a class of biorenewable, biocompatible, and biodegradable materials. The ring-opening polymerization (ROP) of cyclic esters is one of the most powerful methods to access these materials. A novel series of benzoheterocyclic urea catalysts has been synthesized and characterized. When employed in the ROP of δ-valerolactone (δ-VL) in combination with 7-methyl-1,5,7-triazabicyclo4.4.0dec-5-ene (MTBD), a fast and living/controlled feature was observed in both solvent-free and solution polymerization, which was proved by the kinetic and chain extension experiments. With benzyl alcohol as an initiator, polyvalerolactones (PVLs) were achieved with different molecular weight and narrow molecular weight distributions. In addition, the PVLs with different topological structures were prepared by varying the initiators. The structure and thermal properties of resulting polymers were determined by NMR, GPC and DSC analysis. A possible mechanism was also proposed on the basis of NMR analysis.
You have access to this article