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

Taisuke Fujimoto, Emi Yoshimoto, Annaka Masahiko

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

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.

Original languageEnglish
Title of host publicationGels
Subtitle of host publicationStructures, Properties, and Functions
Pages77-86
Number of pages10
Volume136
DOIs
Publication statusPublished - 2009

Publication series

NameProgress in Colloid and Polymer Science
Volume136
ISSN (Print)0340-255X

Fingerprint

Micelles
Self assembly
self assembly
micelles
Water
water
ethylene oxide
Polyethylene oxides
Polymers
radii
polymers
structural stability
Neutron scattering
Dispersions
poly-N-isopropylacrylamide
molecular weight
neutron scattering
Molecular weight
trends
Temperature

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Polymers and Plastics
  • Colloid and Surface Chemistry
  • Materials Chemistry

Cite this

Fujimoto, T., Yoshimoto, E., & Masahiko, A. (2009). Study on self-assembly of telechelic hydrophobically modified poly(N-isopropylacrylamide) in water. In Gels: Structures, Properties, and Functions (Vol. 136, pp. 77-86). (Progress in Colloid and Polymer Science; Vol. 136). https://doi.org/10.1007/2882_2009_11

Study on self-assembly of telechelic hydrophobically modified poly(N-isopropylacrylamide) in water. / Fujimoto, Taisuke; Yoshimoto, Emi; Masahiko, Annaka.

Gels: Structures, Properties, and Functions. Vol. 136 2009. p. 77-86 (Progress in Colloid and Polymer Science; Vol. 136).

Research output: Chapter in Book/Report/Conference proceedingChapter

Fujimoto, T, Yoshimoto, E & Masahiko, A 2009, Study on self-assembly of telechelic hydrophobically modified poly(N-isopropylacrylamide) in water. in Gels: Structures, Properties, and Functions. vol. 136, Progress in Colloid and Polymer Science, vol. 136, pp. 77-86. https://doi.org/10.1007/2882_2009_11
Fujimoto T, Yoshimoto E, Masahiko A. Study on self-assembly of telechelic hydrophobically modified poly(N-isopropylacrylamide) in water. In Gels: Structures, Properties, and Functions. Vol. 136. 2009. p. 77-86. (Progress in Colloid and Polymer Science). https://doi.org/10.1007/2882_2009_11
Fujimoto, Taisuke ; Yoshimoto, Emi ; Masahiko, Annaka. / Study on self-assembly of telechelic hydrophobically modified poly(N-isopropylacrylamide) in water. Gels: Structures, Properties, and Functions. Vol. 136 2009. pp. 77-86 (Progress in Colloid and Polymer Science).
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