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• W2147516541 abstract "Abstract The ring‐opening polymerizations (ROPs) of ε‐caprolactone (ε‐CL) and δ‐valerolactone (δ‐VL) with pentafluorophenylbis(triflyl)methane (C 6 F 5 CHTf 2 ) as the organocatalyst and alcohol initiators were carried out. For the ROP using 3‐phenyl‐1‐propanol (PPA) as the initiator in CH 2 Cl 2 at room temperature with the [ε‐CL or δ‐VL] 0 /[PPA] 0 /[C 6 F 5 CHTf 2 ] ratio of 50/1/0.1, the polymerization homogeneously proceeded to afford poly(ε‐caprolactone) (PCL) and poly(δ‐valerolactone) (PVL) having narrow polydispersity indices. The molecular weights of the obtained polymers determined from 1 H NMR spectra showed good agreement with those estimated from the initial ratio of [ε‐CL or δ‐VL] 0 /[PPA] 0 and monomer conversions. The 1 H NMR, size exclusion chromatography, and matrix‐assisted laser desorption ionization time‐of‐flight mass spectrometry measurements strongly indicated that PCL and PVL possessed the 3‐phenylpropoxy group as the α‐chain‐end and the hydroxy group as the ω‐chain‐end. In addition, the controlled/living nature for the C 6 F 5 CHTf 2 ‐catalyzed ROP of lactones was confirmed by kinetic and chain‐extension experiments. The block copolymerization of PCL and PVL successfully proceeded to afford PCL‐ b ‐PVL and PVL‐ b ‐PCL. In addition, various end‐functionalized PCLs and PVLs with narrow molecular weight distributions were synthesized by the ROP of ε‐CL and δ‐VL using functional initiators, such as 6‐azido‐1‐hexanol, 2‐hydroxyethyl methacrylate, propargyl alcohol, N ‐(2‐hydroxyethyl)maleimide, 4‐vinylbenzyl alcohol, 5‐hexen‐1‐ol, and 5‐norbornene‐2‐methanol. © 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2011" @default.
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• W2147516541 date "2011-06-22" @default.
• W2147516541 modified "2023-10-18" @default.
• W2147516541 title "Synthesis of various end-functionalized polyesters by controlled/living ring-opening polymerization of lactones using pentafluorophenylbis(triflyl)methane" @default.
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• W2147516541 doi "https://doi.org/10.1002/pola.24815" @default.
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