Temperature-induced structure switch in thermo-responsive micellar interpolyelectrolyte complexes: toward core-shell-corona and worm-like morphologies

被引：20

作者：

Daehling, Claudia ^{[1
]}

Lotze, Gudrun ^{[2
]}

Drechsler, Markus ^{[3
]}

Mori, Hideharu ^{[4
]}

Pergushov, Dmitry V. ^{[5
]}

Plamper, Felix A. ^{[1
]}

机构：

[1] Rhein Westfal TH Aachen, Inst Phys Chem, Landoltweg 2, D-52056 Aachen, Germany

[2] ESRF, High Brilliance Beamline ID02,71 Ave Martyrs, F-38043 Grenoble 9, France

[3] Univ Bayreuth, Bayreuth Inst Macromol Chem BIMF, Univ Str 30, D-95447 Bayreuth, Germany

[4] Yamagata Univ, Grad Sch Sci & Engn, Dept Polymer Sci & Engn, 4-3-16 Jonan, Yonezawa, Yamagata 9928510, Japan

[5] Moscow MV Lomonosov State Univ, Dept Chem, Leninskie Gory 1-3, Moscow 119991, Russia

来源：

SOFT MATTER | 2016年 / 12卷 / 23期

关键词：

SHAPED POLY(ACRYLIC ACID); DIBLOCK COPOLYMERS; BLOCK-COPOLYMERS; LIGHT-SCATTERING; QUATERNIZED POLY(4-VINYLPYRIDINE); MULTICOMPARTMENT MICELLES; MOLECULAR-WEIGHT; MIKTOARM STARS; WATER; POLYMERS;

D O I：

10.1039/c6sm00757k

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：

The spontaneous formation and thermo-responsiveness of a colloidally-stable interpolyelectrolyte complex (IPEC) based on a linear temperature-sensitive diblock copolymer poly(vinyl sulfonate)(31)-b-poly(N-isopropyl acrylamide)(27) (PVS31-b-PNIPAM(27)) and a star-shaped quaternized miktoarm polymer poly(ethylene oxide)(114)-(poly(2-(dimethylamino)ethyl methacrylate)(17))(4) (PEO114-(qPDMAEMA(17))(4)) was investigated in aqueous media at 0.3 M NaCl by means of dynamic light scattering (DLS), small angle X-ray scattering (SAXS), and cryogenic transmission electron microscopy (cryo-TEM). The micellar macromolecular co-assemblies show a temperature-dependent size and morphology, which result from the lower critical solution temperature (LCST) behavior of the PNIPAM-blocks. Hence, the micellar co-assemblies grow upon heating. At 60 degrees C, spherical core-shell-corona co-assemblies are proposed with a hydrophobic PNIPAM core, a water-insoluble IPEC shell, and a hydrophilic PEO corona. These constructs develop into a rod-like structure upon extended equilibration. In turn, PEO-arms and PNIPAM-blocks within a hydrophilic mixed two-component corona surround the water-insoluble IPEC domain at 20 degrees C, thereby forming spherical core-corona co-assemblies. Reversibility of the structural changes is suggested by the scattering data. This contribution addresses the use of a combination of oppositely charged thermo-responsive and bis-hydrophilic star-shaped polymeric components toward IPECs of diverse morphological types.

引用

页码：5127 / 5137

页数：11