Abstract
(R)-(−)-1,1′-Binaphthyl-2,2′-diyl hydrogen phosphate (BPA) has been demonstrated as an efficient organocatalyst for controlled ring-opening homopolymerization of ε-caprolactone (ε-CL) and copolymerization of ε-CL with glycolide and lactide. High molar mass PCL with narrow molar mass distribution has also been synthesized from the bulk ring-opening polymerization (ROP) of ε-CL with BPA as catalysts; the highest molar mass of PCL is 4.35 × 104 g/mol with polydispersity index of 1.20. The successful synthesis of high molar mass PCL is attributed to the bifunctional activation mechanism for the ROP of ε-CL catalyzed by BPA. More interestingly, ppm level of BPA is sufficient to catalyze controlled ROP of ε-CL.
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This work is funded by the National Natural Science Foundation (NNSF) of China (21104020), the Ministry of Science and Technology of China (2012CB933802), and the Fundamental Research Funds for the Central Universities is greatly appreciated.
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Zhou, X., Hong, L. Controlled ring-opening polymerization of cyclic esters with phosphoric acid as catalysts. Colloid Polym Sci 291, 2155–2162 (2013). https://doi.org/10.1007/s00396-013-2950-9
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DOI: https://doi.org/10.1007/s00396-013-2950-9