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- W2080973878 abstract "Poly(ɛ-caprolactone)2-b-poly(L-lactide)2 miktoarm block copolymers were successfully synthesized via ring-opening polymerization using pentaerythritol as the initiator and a protection–deprotection procedure. 1H nuclear magnetic resonance (1H NMR) and size exclusion chromatography (SEC) were employed to characterize the miktoarm structure, molecular weight and molecular weight distribution. The microspheres of poly(ɛ-caprolactone)2-b-poly(L-lactide)2 ((PCL)2-b-(PLLA)2) were produced by an oil-in-water emulsion solvent extraction/evaporation method and studied with scanning electron microscopy (SEM). The hydrolytic degradation of microspheres with different architectures and compositions was performed at 37 °C in a phosphate-buffered saline solution (pH=7.4). The weight loss of the microspheres was strongly affected by the molecular architecture, chain length and composition. The compositional, or molar ratio, changes were monitored during the degradation using 1H NMR, SEC, differential scanning calorimetry and SEM, all of which suggested that the degradation proceeded from the surface to the interior and could be described using a combined degradation model with surface erosion and bulk degradation. Poly(ɛ-caprolactone)2-b-poly(L-lactide)2 miktoarm block copolymers were successfully synthesized via ring-opening polymerization with protection–deprotection procedure, using pentaerythritol as initiator. The degradation behavior of (PCL)2-b-(PLLA)2 microspheres, which were produced by oil-in-water emulsion solvent extraction/evaporation method, showed that the degradation occurred from the surface to the interior as a combined degradation model with surface erosion and bulk degradation." @default.
- W2080973878 created "2016-06-24" @default.
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- W2080973878 date "2012-10-10" @default.
- W2080973878 modified "2023-09-30" @default.
- W2080973878 title "Synthesis and degradation behavior of miktoarm poly(ɛ-caprolactone)2-b-poly(L-lactone)2 microspheres" @default.
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- W2080973878 doi "https://doi.org/10.1038/pj.2012.166" @default.
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