Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5210970 | Reactive and Functional Polymers | 2009 | 6 Pages |
Abstract
The synthesis of ABA triblock copolymers comprised of polyisobutylene (PIB) and poly(γ-benzyl-l-glutamate) (PBLG) segments has been demonstrated for the first time by the polymerization of γ-benzyl-l-glutamate N-carboxyanhydride (BLG-NCA) initiated with well-defined α,Ï-primary amino-functional PIBs. The ammonium-mediated polymerization of BLG-NCA provided better control of molecular weights and lower polydispersity indices (PDIs) compared to the conventional polymerization. The compositional homogeneity of the block copolymers has been confirmed by GPC-MALLS and 1H NMR spectroscopy. Since the resulting ABA triblock copolymer possessed primary amino groups at α,Ï-ends, further extension reaction with 4,4â²-methylene-bis(phenyldiisocyanate) was possible to afford a novel (ABA)n multiblock copolymer.
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Authors
Tomoya Higashihara, Rudolf Faust,