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- W2383021196 abstract "Tri-and tetra-arm star poly(e-caprolactone)s have been successfully synthesized by ring-opening polymerization of e-caprolactone using triethanolamine or N,N,N',N'-tetrakis-(2-hydroxyethyl)ethylenediamine(HEA)as the multifunctional initiator and lanthanum tris(2,6-di-tert-butyl-4-methylphenolate)(La(DBMP)3)as the catalyst.In 1H NMR analysis,compared with triethanolamine and HEA molecules,the chemical shifts of the hydrogen(N(CH2CH2O)n,n=3,4)in star poly(e-caprolactone)s moved from 3.65 to 4.10,suggesting the direct linkage between the poly(e-caprolactone)arm and the initiator.When the molar ratio of triethanolamine to La(DBMP)3 ranged from 1.7 to 6.4,pure tri-arm star poly(e-caprolactone)could be prepared,which indicates that one catalyst molecule could co-work with several initiator molecules.The molecular weights of star poly(e-caprolactone)were determined by 1H NMR end group analysis,which are very close to the values calculated from the molar ratio of e-caprolactone to the initiator." @default.
- W2383021196 created "2016-06-24" @default.
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- W2383021196 date "2007-06-25" @default.
- W2383021196 modified "2023-09-23" @default.
- W2383021196 title "Synthesis of Star Poly(ε-caprolactone) Catalyzed by Lanthanum Tris(2,6-di-tert-butyl-4-methylphenolate)" @default.
- W2383021196 hasPublicationYear "2007" @default.
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