Diblock/Triblock Structural Transition and Sol-Gel Transition of Peptide/PEG Diblock Copolymer Having a Terminal Terpyridine Group Induced by Complexation with Metal Ion | Zendy

Satoshi Tanimoto | Zendy; Yasushi Nakamura | Zendy; H. Yamaoka | Zendy; Yoshitsugu Hirokawa | Zendy

Open Access

Diblock/Triblock Structural Transition and Sol-Gel Transition of Peptide/PEG Diblock Copolymer Having a Terminal Terpyridine Group Induced by Complexation with Metal Ion

Author(s) -

Satoshi Tanimoto,

Yasushi Nakamura,

H. Yamaoka,

Yoshitsugu Hirokawa

Publication year - 2010

Publication title -

international journal of polymer science

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.399

H-Index - 33

eISSN - 1687-9430

pISSN - 1687-9422

DOI - 10.1155/2010/294790

Subject(s) - copolymer , micelle , polymer chemistry , materials science , terpyridine , aqueous solution , dynamic light scattering , polymerization , monomer , chemistry , metal , nanoparticle , polymer , organic chemistry , nanotechnology , metallurgy , composite material

Terpyridine-polyethyleneglycol-block-polyleucine block copolymer (tpy-PEG-PLeu) was synthesized by a ring-opening polymerization of L-leucine -carboxyanhydride. The copolymer complexed with Fe2+ ion and its aqueous solution showed a purple color as a result of the complexation. This complexation caused the diblock/triblock structural transition of the copolymer. The change of the aggregation behavior caused by the structural transition was observed by a dynamic light scattering apparatus. The diblock tpy-PEG-PLeu copolymer formed a micelle in the aqueous solution. On the other hand, the triblock-type copolymer, after the complexation, formed the micelle structures and huge aggregates, which is considered to be a network structure. The complexation of the diblock tpy-PEG-PLeu copolymer with Fe ion is consequently considered to be a trigger of the gelation

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