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• W2000774169 abstract "Abstract Biodegradable, amphiphilic, four‐armed poly(ϵ‐caprolactone)‐ block ‐poly(ethylene oxide) (PCL‐ b ‐PEO) copolymers were synthesized by ring‐opening polymerization of ethylene oxide in the presence of four‐armed poly(ϵ‐caprolactone) (PCL) with terminal OH groups with diethylzinc (ZnEt 2 ) as a catalyst. The chemical structure of PCL‐ b ‐PEO copolymer was confirmed by 1 H NMR and 13 C NMR. The hydroxyl end groups of the four‐armed PCL were successfully substituted by PEO blocks in the copolymer. The monomodal profile of molecular weight distribution by gel permeation chromatography provided further evidence for the four‐armed architecture of the copolymer. Physicochemical properties of the four‐armed block copolymers differed from their starting four‐armed PCL precursor. The melting points were between those of PCL precursor and linear poly(ethylene glycol). The length of the outer PEO blocks exhibited an obvious effect on the crystallizability of the block copolymer. The degree of swelling of the four‐armed block copolymer increased with PEO length and PEO content. The micelle formation of the four‐armed block copolymer was examined by a fluorescent probe technique, and the existence of the critical micelle concentration (cmc) confirmed the amphiphilic nature of the resulting copolymer. The cmc value increased with increasing PEO length. The absolute cmc values were higher than those for linear amphiphilic block copolymers. © 2004 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 42: 950–959, 2004" @default.
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• W2000774169 date "2004-01-06" @default.
• W2000774169 modified "2023-10-18" @default.
• W2000774169 title "Synthesis of four-armed poly(ε-caprolactone)-<i>block</i> -poly(ethylene oxide) by diethylzinc catalyst" @default.
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• W2000774169 doi "https://doi.org/10.1002/pola.11052" @default.
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