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• W1997466237 abstract "Abstract Poly( l -lactide)/poly(ɛ-caprolactone) diblock, triblock and four-armed copolymers with the same monomer feed ratio (50/50) were synthesised by two step ring opening polymerisation of successively added ɛ-caprolactone and l -lactide, using isopropanol, ethylene glycol, or pentaerythritol as initiator and zinc lactate as co-initiator. The resulting copolymers were characterised by 1 H NMR, DSC, SEC, and FT-IR, which confirmed the blocky characteristic of the copolymers. Solution cast films were allowed to degrade at 37 °C in the presence of proteinase K, and the degradation was monitored by gravimetry, DSC, SEC, 1 H NMR and ESEM. The effects of chain structure, block length and crystallinity on the degradation are discussed. The four-armed block copolymer degrades the most rapidly, while the diblock copolymer exhibited the slowest degradation rate. The difference was related to the crystallinity depending on both the molecular structure and block length. Little compositional or molar mass changes were obtained during degradation, which strongly supports a surface erosion mechanism, in agreement with ESEM observations." @default.
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• W1997466237 date "2009-02-01" @default.
• W1997466237 modified "2023-10-03" @default.
• W1997466237 title "Enzyme-catalyzed degradation of poly(l-lactide)/poly(ɛ-caprolactone) diblock, triblock and four-armed copolymers" @default.
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• W1997466237 doi "https://doi.org/10.1016/j.polymdegradstab.2008.10.023" @default.
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