Abstract
The ring-opening polymerization of ε-caprolactone (CL) has been initiated by yttrium triflate (trifluoromethanesulfonate) in air using simple glass vials at 60 °C without desiccation steps and stirring. The number averaged molecular weight and molecular weight distribution of the obtained poly(ε-caprolactone) (PCL) was 5000–12000 and about 1.2, respectively. It was found that this polymerization reaction of CL was activated by the addition such as little water or 2-propanol. The copolymerization activities of comonomers such as L-lactide, γ-butyrolactone, δ-octanolactone, δ-decanolactone, or ω-pentadecalactone with CL by yttrium triflate were very low at 60 °C. Direct molding method during polymerization of PCL at 40 °C by yttrium triflate was developed. It was found that this direct molding PCL (Mn=2000, Mw/Mn=3.07) was biodegraded very slowly in a buffer (pH 7.0) with a lipase produced by Rhizoupus arrhizus.
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Kunioka, M., Wang, Y. & Onozawa, Sy. Polymerization of Poly(ε-caprolactone) Using Yttrium Triflate. Polym J 35, 422–429 (2003). https://doi.org/10.1295/polymj.35.422
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DOI: https://doi.org/10.1295/polymj.35.422
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