Programmed thermodynamic formation and structure analysis of star-like nanogels with core cross-linked by thermally exchangeable dynamic covalent bonds

Yoshifumi Amamoto, Yuji Higaki, Yasuhiro Matsuda, Hideyuki Otsuka, Atsushi Takahara

研究成果: ジャーナルへの寄稿学術誌査読

97 被引用数 (Scopus)

抄録

Programmed thermodynamic formation of star-like nanogels from designed diblock copolymers with thermally exchangeable dynamic covalent bonds in their side chains and structure analysis of the nanogels were performed. Linear diblock copolymers that consist of poly(methyl methacrylate) block and random copolymer block of methyl methacrylate (MMA) and methacrylic esters with alkoxyamine moiety were prepared by atom transfer radical polymerization (ATRP). By heating the diblock copolymers in anisole, a cross-linking reaction occurred as a result of the radical crossover reaction of alkoxyamine moieties to afford star-like nanogels. Kinetic studies have revealed that the cross-linking behavior reaches equilibrium at a given reaction time, with characteristic reaction behaviors for thermodynamic reactions being observed. The equilibrium structures of the star-like nanogels were controlled by the initial concentrations of diblock copolymers as well as their compositions and molecular weights. Furthermore, by heating the star-like nanogels with excess alkoxyamine, linear polymers were successfully regenerated. The molecular weights and sizes of the nanogels were evaluated by gel permeation chromatography-multiangle laser light scattering (GPC-MALLS) and small-angle X-ray scattering (SAXS) measurements, respectively, and the morphologies of the nanogels were directly observed by scanning force microscopy (SFM).

本文言語英語
ページ(範囲)13298-13304
ページ数7
ジャーナルJournal of the American Chemical Society
129
43
DOI
出版ステータス出版済み - 10月 31 2007

!!!All Science Journal Classification (ASJC) codes

  • 触媒
  • 化学一般
  • 生化学
  • コロイド化学および表面化学

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