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- W1999611548 abstract "Abstract The preparation of star‐shaped poly( γ ‐benzyl‐ L ‐glutamate)s by the ring‐opening polymerization of N ‐carboxy anhydride γ ‐benzyl‐ L ‐glutamate (BLG‐NCA) with hexakis(4‐aminomethylphenoxy)‐ ( 4 ) and hexakis(4‐aminophenoxy)cyclotriphosphazenes ( 6 ), and the conformation of resulting polymers has been studied. The six amino groups in 4 can initiate the polymerization of BLG‐NCA to give star‐shaped polyglutamates ( 7 ) with narrow molecular weight distributions ( M w / M n = 1.10–1.33). For the polymerization of BLG‐NCA with 6 , however, a high ratio of [BLG‐MCA]/[ 6 ] was required to obtain star‐shaped polyglutamates ( 8 ). The conformation of 7 changed from a β ‐sheet form to a right‐handed α ‐helix form, depending on the degree of polymerization per chain ( DP n /6). The helix content of hexa‐armed poly ( γ ‐benzyl‐ L ‐glutamate‐ co ‐ L ‐glutamic acid)s ( 9 ), prepared by partial hydrolysis of 7 , increased significantly compared with that of the corresponding linear analogue ( 10 ). As increasing of helix content of 9 , the fluorescence spectra of 8‐anilino‐1‐naphthalenesulfonic acid (ANS), a fluorescence probe, shifted to a short wavelength accompanied by the enhancement of intensity, suggesting that star‐shaped polymers are liable to form hydrophobic domains. From these results and the structural feature of the cyclotriphosphazene core, the formation of a 3 α ‐helix bundle structure of polyglutamates on both sides of the phosphazene ring has been suggested. magnified image" @default.
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- W1999611548 date "2003-01-01" @default.
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- W1999611548 title "Synthesis and Conformation of Star-Shaped Poly(γ-benzyl-L-glutamate)s on a Cyclotriphosphazene Core" @default.
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- W1999611548 doi "https://doi.org/10.1002/mabi.200390002" @default.
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