Micellar aggregates of amylose-block-polystyrene rod-coil block copolymers in water and THF

被引：83

作者：

Loos, K ^{[1
]}

Böker, A ^{[1
]}

Zettl, H ^{[1
]}

Zhang, AF ^{[1
]}

Krausch, G ^{[1
]}

Müller, AHE ^{[1
]}

机构：

[1] Univ Bayreuth, BZKG, D-95440 Bayreuth, Germany

来源：

MACROMOLECULES | 2005年 / 38卷 / 03期

关键词：

D O I：

10.1021/ma0345549

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Amylose-block-polystyrenes with various block copolymer compositions were investigated in water and in THF solution. Fluorescence correlation spectroscopy, dynamic light, scattering (DLS), and asymmetric flow field-flow fractionation with multiangle light scattering detection indicate the presence of unimers, oligomers, and large micellar species in THF. Up to four different species: were detectable by DLS with hydrodynamic radii ranging from a few nanometers to > 10 mum, indicating that the system is not in a thermodynamic equilibrium state. Collapsed aggregrates were monitored on a Silicon surface by scanning force microscopy and transmission electron microscopy. In water. crew-cut micelles were obtained from the same block copolymers by a single solvent approach, using elevated temperature and pressure. These crew-cut aggregates are much more uniform than the respective star aggregates in THF, and their radii scale with R-h proportional to N-core(1/4), R-h proportional to N-corona(1/6) in solution and with R proportional to N-core(1/4), R proportional to N-corona(1/2) on a silicon surface.

引用

页码：873 / 879

页数：7

共 54 条

[41] Characterization of micelles of polyisobutylene-block-poly(methacrylic acid) in aqueous medium [J].