bei Google ScholarTitelangaben
Schmalz, Holger ; Schmelz, Joachim ; Drechsler, Markus ; Yuan, Jiayin ; Walther, Andreas ; Schweimer, Kristian ; Mihut, Adriana M.:
Thermo-reversible formation of wormlike micelles with a microphase-separated corona from a semicrystalline triblock terpolymer.
In: Macromolecules.
Bd. 41
(2008)
Heft 9
.
- S. 3235-3242.
ISSN 1520-5835
DOI: https://doi.org/10.1021/ma702417y
Abstract
The thermo-reversible formation of wormlike micelles from a polystyrene-block-polyethylene-block-poly(methyl methacrylate) (PS-b-PE-b-PMMA) triblock terpolymer with a crystallizable middle block in organic media is presented. The formation of wormlike micelles is rather unexpected, because PE containing diblock copolymers usually form platelet-like structures. Transmission electron microscopy (TEM) investigations revealed a core-corona structure for the wormlike micelles. The core is formed by crystalline PE domains, and the soluble corona exhibits a patched structure composed of microphase-separated PS and PMMA chains. Microphase separation of the coronal chains was proven by 2D H-1 nuclear Overhauser effect spectroscopy (NOESY) and TEM investigations of selectively stained samples. A combination of various techniques, such as differential scanning calorimetry (DSC), dynamic light scattering (DLS), and scanning force microscopy (SFM), indicated that the wormlike micelles might be formed by crystallization-induced aggregation of spherical micelles upon cooling. The presented approach opens an alternative way to produce anisotropic polymer nanostructures with a microphase-separated corona.