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- W2056533505 abstract "Via living cationic polymerization with a trifunctional initiator, amphiphilic tri-armed star block copolymers were synthesized, where each arm consisted of an AB-block copolymer with a hydrophobic and soft vinyl ether segment and a hydrophilic (amine-containing) and hard styrene segment. The sequential living polymerization was initiated first for 2-chloroethyl vinyl ether (CEVE) with the trifunctional HCl-adduct (1) of a trivinyl ether in conjunction with SnCl4 in the presence of n-Bu4NCl and 2.6-di-tert-butyl-4-methylpyridine (DTBMP) in CH2Cl2 at −78 °C, followed by block polymerization of p-(phthalimidemethyl)styrene (ImSt). The polymers had 3 arm chains with controlled molecular weights and compositions and with narrow molecular weight distributions (Mw/Mn∼1.3). Similar star amphiphiles were prepared by “one-shot” living cationic block polymerizations of CEVE and ImSt with 1/SnCl4/DTBMP in CH2Cl2 at −15 °C, due to the large reactivity difference between the two monomers (CEVE >> ImSt). Hydrazinolysis of the imide functions gave tri-armed amphiphilic block copolymers consisting of a hydrophobic poly(CEVE) soft segment and a hydrophilic hard polystyrene segment with pendant primary amino groups, soluble in dimethyl sulfoxide, methanol, water, and 0.5N HCl. Besides the soft-hard (CEVE–ImSt) version, the soft-soft tri-armed polymers were also prepared, consisting of an amino-functionalized hydrophilic soft poly(vinyl ether) segment and a hydrophobic poly(CEVE) segment. The surface tension of the tri-armed polymers was smaller than that of the linear block (or arm) polymers. Small angle light scattering measurement showed that these tri-armed copolymers exit as unimers in water." @default.
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- W2056533505 date "1999-11-01" @default.
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- W2056533505 title "Amphiphilic 3-Arm Star Block Polymers by Living Cationic Polymerization" @default.
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- W2056533505 doi "https://doi.org/10.1295/polymj.31.995" @default.
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