Asymmetric swelling and self-assembly of poly(N-isopropyl-acrylamide)-block-poly(ethylene glycol) in water

R. Motokawa, K. Morishita, S. Koizumi, E. Yoshimoto, M. Annaka

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

This investigation focused on the self-assembly of poly(N-isopropylacrylamide)-block-poly(ethylene glycol) (PNIPA-b-PEG) in water. We distinguish four regions in the phase diagram: a transparent sol, opaque sol, opaque gel, and syneresis. Small-angle neutron scattering measurements revealed that microphase separation occurs above 17 {ring operator} C to form disordered micelles, which includes a range of states from (i) asymmetric swelling to (ii) micelle formation with only short-range liquid-like order. This result may be attributed to the action of water, which starts to behave as a selective solvent for PEG blocks; the PEG chains are more swollen with water than are the PNIPA chains.

Original languageEnglish
Pages (from-to)745-748
Number of pages4
JournalPhysica B: Condensed Matter
Volume385-386 I
DOIs
Publication statusPublished - Nov 27 2006

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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