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Trifluoroacetic anhydride (TFAA) and asymmetric telechelic α-hydroxyl-ω-(carboxyl acid) poly(ε-caprolactone) (HA-PCL) were used to obtain in situ α-trifluoroacetate-ω-trifluoroacetanhydride poly(ε-caprolactone) (TF-PCL). After reaction, the polymer was characterized by 1H and 13C NMR, MALDI-TOF, FT-IR, DSC, and TGA. Under the influence of TF-PCL and its terminal groups, parasitic reactions as transesterifications and inter- and intramolecular condensation are favored. The reactivity of ω-trifluoroacetanhydride end group with α-hydroxyl-ω-methoxy polyethyleneglycol (MPEG) was used for the synthesis of poly(ε-caprolactone-b-ethylene glycol) (PCL-b-PEG) diblock copolymer. [ABSTRACT FROM AUTHOR]

Poly(ε-caprolactone) (PCL) oligomers with α-hydroxyl-ω-alkyl end groups (alkyl =-CH2-[CH2-CH2]m-CH3, where m = 1, 2, 4, 5, 6, 7, 8, 9, and 10) were synthesized by ring-opening polymerization (ROP) of ε-caprolactone (CL) catalyzed by ammonium decamolybdate (NH4)8[Mo10O34] and using aliphatic primary alcohols as initiators (HO-CH2-[CH2-CH2]m-CH3, where m = 1, 2, 4, 5, 6, 7, 8, 9, and 10). The characterizations of the PCL oligomers were determined by MALDI-TOF, GPC, FT-IR, SAXS and 1H and 13C NMR. The effects of alkyl end groups on thermal properties of the PCL oligomers were analyzed by DSC and TGA. [ABSTRACT FROM AUTHOR]

Poly(glycolide) (PGA) oligomers were obtained by ring-opening polymerization (ROP) of glycolide (GA) catalyzed by ammonium decamolybdate (NH4)8[Mo10O34] and using aliphatic primary alcohols as initiators/chain transfer agents (HO-CH2-[CH2-CH2]m-CH3, where m = 1, 2, 4, 5, 6, 7, 8, 9, and 10). High yield (85-95%) and short reaction time (15 min) were observed. The characterization of PGA oligomers was determined by 1H and 13C NMR, FT-IR, and DSC. [ABSTRACT FROM AUTHOR]