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

被引：10

作者：

Higuchi, Takeshi

Yabu, Hiroshi

Onoue, Shinya

Kunitake, Toyoki

Shimomura, Masatsugu

机构：

[1] Tohoku Univ, Inst Multidisciplinary Res Adv Mat, Aoba Ku, Sendai, Miyagi 9808677, Japan

[2] Hokkaido Univ, Grad Sch Sci, Kita Ku N10W8, Sapporo, Hokkaido 0600810, Japan

[3] RIKEN, Frontier Res Team, Wako, Saitama 3510198, Japan

[4] Japan Sci & Technol JST, CREST, Kawaguchi, Saitama 3320012, Japan

来源：

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2008年 / 313卷

关键词：

block-copolymer; nanoparticle; self-organization; phase transition; annealing;

D O I：

10.1016/j.colsurfa.2007.04.076

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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 degrees 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. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：87 / 90

页数：4

共 12 条

[1] Bilayers and interdigitation in block copolymer vesicles [J].