Study on self-assembly of telechelic hydrophobically modified poly(N-isopropylacrylamide) in water

Taisuke Fujimoto, Emi Yoshimoto, Masahiko Annaka

研究成果: Chapter in Book/Report/Conference proceedingChapter

抄録

The microscopic structures of aqueous dispersions of hydrophobically modified poly(N-isopropylacrylamides) (HM-PNIPAM) and hydrophobically modified poly(ethylene oxide) (HM-PEO), which carry an octadecyl group at each chain end and have an average molecular weight of 20,000 g/mol, were investigated by small-angle neutron scattering (SANS). When the polymer concentration exceeds the overlap concentration, connectivity through bridging chains takes place, resulting in the formation of a network in which flower micelles act as junctions. The temperature dependence of the micelle structure is significant in the case of the HM-PNIPAM system but not significant in the case of the HM-PEO system, indicating the importance of hydrophobic interactions in the structural stability of flower micelles. Two different parameters relating to the micelle size are defined depending on the polymer concentration. One is the total micelle radius in the dilute regime and the other is the non-overlapping radius of the micelles in the semi-dilute regime. These two parameters exhibit qualitatively different trends with respect to temperature.

本文言語英語
ホスト出版物のタイトルGels
ホスト出版物のサブタイトルStructures, Properties, and Functions
編集者Masayuki Tokita, Katsuyoshi
ページ77-86
ページ数10
DOI
出版ステータス出版済み - 12 1 2009

出版物シリーズ

名前Progress in Colloid and Polymer Science
136
ISSN(印刷版)0340-255X

All Science Journal Classification (ASJC) codes

  • 物理化学および理論化学
  • 有機化学
  • ポリマーおよびプラスチック
  • コロイド化学および表面化学
  • 材料化学

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