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

被引：1

作者：

Motokawa, R.

Morishita, K.

Koizumi, S.

Yoshimoto, E.

Annaka, M. ^{[1
]}

机构：

[1] Kyushu Univ, Dept Chem, Fukuoka 8128581, Japan

[2] Japan Atom Energy Agcy, Adv Sci Res Ctr, Ibaraki 3191195, Japan

来源：

PHYSICA B-CONDENSED MATTER | 2006年 / 385卷

关键词：

self-assembly; poly(N-isopropylacrylamide)-block-poly(ethylene glycol); small-angle neutron scattering;

D O I：

10.1016/j.physb.2006.06.050

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

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 degrees 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. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：745 / 748

页数：4

共 6 条

[1]

Hamley I., 1998, The Physics of Block Copolymers Oxford University Press

[2] THEORY OF INTERFACE BETWEEN IMMISCIBLE POLYMERS .2. [J].