Preparation of lamella-structured block-copolymer particles and their irreversible lamella-disorder phase transition

Takeshi Higuchi, Hiroshi Yabu, Shinya Onoue, Toyoki Kunitake, Masatsugu Shimomura

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

In this report, we investigated the effect of annealing on the phase separation structures formed in the block-copolymer nanoparticles. The nanoparticles with the lamellar structures were prepared by evaporation of tetrahydrofuran (THF) from the THF/water solution of poly(styrene-b-isoprene), in which each polymer segment has almost same length. Scanning transmission electron microscope (STEM) observation of the block-copolymer nanoparticles and their cross-section image revealed that the consecutive lamellar structure was formed one-directionally in the nanoparticles. When the suspension of lamellar-structured nanoparticles was annealed at 50 °C for 10 h, the lamellar phase changed to the disorder structures. This transition was irreversible. This result shows the lamellar structure formed in nanoparticles is less stable than that in the planar film.

Original languageEnglish
Pages (from-to)87-90
Number of pages4
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume313-314
DOIs
Publication statusPublished - Feb 1 2008
Externally publishedYes

Fingerprint

lamella
block copolymers
Block copolymers
Phase transitions
disorders
Nanoparticles
nanoparticles
preparation
Lamellar structures
tetrahydrofuran
Isoprene
Styrene
Phase separation
polystyrene
Suspensions
Polymers
Evaporation
Electron microscopes
electron microscopes
evaporation

All Science Journal Classification (ASJC) codes

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

Cite this

Preparation of lamella-structured block-copolymer particles and their irreversible lamella-disorder phase transition. / Higuchi, Takeshi; Yabu, Hiroshi; Onoue, Shinya; Kunitake, Toyoki; Shimomura, Masatsugu.

In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 313-314, 01.02.2008, p. 87-90.

Research output: Contribution to journalArticle

Higuchi, Takeshi ; Yabu, Hiroshi ; Onoue, Shinya ; Kunitake, Toyoki ; Shimomura, Masatsugu. / Preparation of lamella-structured block-copolymer particles and their irreversible lamella-disorder phase transition. In: Colloids and Surfaces A: Physicochemical and Engineering Aspects. 2008 ; Vol. 313-314. pp. 87-90.
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