Shear-induced formation of multilamellar vesicles ("onions") in block copolymers

被引：112

作者：

Zipfel, J

Lindner, P

Tsianou, M

Alexandridis, P

Richtering, W ^{[1
]}

机构：

[1] SUNY Buffalo, Dept Chem Engn, Buffalo, NY 14260 USA

[2] Univ Freiburg, Inst Makromol Chem, D-79104 Freiburg, Germany

[3] Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France

[4] Lund Univ, Ctr Chem & Chem Engn, S-22100 Lund, Sweden

来源：

LANGMUIR | 1999年 / 15卷 / 08期

关键词：

D O I：

10.1021/la981666y

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The use of shear to control the microstructure in the lyotropic lamellar region of a ternary isothermal poly(ethylene oxide)-b-poly(propylene oxide)-b-poly(ethylene oxide) (Pluronic P123)/ water/butanol system was investigated by means of small angle neutron and light scattering (SANS, SALS), birefringence, and rheology. A transition from parallel to perpendicular alignment of lamellae, with a corresponding decrease in the viscosity, was found with increasing shear rate at high block copolymer concentrations. At low polymer content, however, the samples were shear thickening, and a shear-induced formation of multilamellar vesicles ("onions") was observed for the first time in block copolymer systems.

引用

页码：2599 / 2602

页数：4

共 30 条

[1] A record nine different phases (four cubic, two hexagonal, and one lamellar lyotropic liquid crystalline and two micellar solutions) in a ternary isothermal system of an amphiphilic block copolymer and selective solvents (water and oil) [J].