Water-soluble interpolyelectrolyte complexes of polyisobutylene-block-poly(methacrylic acid) micelles:: Formation and properties

被引：65

作者：

Burkhardt, Markus ^{[1
]}

Ruppel, Markus ^{[1
]}

Tea, Sandrine ^{[1
]}

Drechsler, Markus ^{[1
]}

Schweins, Ralf ^{[2
]}

Pergushov, Dmitry V. ^{[3
]}

Gradzielski, Michael ^{[4
]}

Zezin, Alexander B. ^{[3
]}

Mueller, Axel H. E. ^{[1
]}

机构：

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

[2] Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France

[3] Moscow MV Lomonosov State Univ, Sch Chem, Dept Polymer Sci, Moscow 119991, Russia

[4] Tech Univ Berlin, Inst Chem, Stranski Lab Phys & Theoret Chem, D-10623 Berlin, Germany

来源：

LANGMUIR | 2008年 / 24卷 / 05期

关键词：

D O I：

10.1021/la701835r

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We report on interpolyelectrolyte complexes (IPECs) formed by micelles of ionic amphiphilic diblock copolymers with polyisobutylene (PIB) and poly(sodium methacrylate) (PMANa) blocks interacting with quaternized poly(4-vinylpyridine) (P4VPQ). The interpolyelectrolyte complexation was followed by turbidimetry and small angle neutron scattering (SANS). The data obtained by means of a combination of SANS, dynamic light scattering (DLS), and cryogenic transmission electron microscopy (cryo-TEM) provide evidence on the core-shell-corona structure of the complex species with the shell assembled from fragments of electrostatically bound PMANa and quaternized P4VPQ fragments, original PIBx-b-PMAA(y) micelles apparently playing a lyophilizing part. The complex formation is followed by potentiometric titration as well. This process is initially kinetically controlled. In the second step larger aggregates rearrange in favor of smaller complexes with core-shell-corona structure, which are thermodynamically more stable. An increase in ionic strength of the solution results in dissociation of the complex species as proven by SANS and analytical ultracentrifugation (AUC). This process begins at the certain threshold ionic strength and proceeds via a salt-induced gradual release of chains of the cationic polyectrolyte from the complex species.

引用

页码：1769 / 1777

页数：9

共 36 条

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