Jump to main content
Jump to site search

Issue 26, 2012

Hierarchical self-assembly of star-shaped organometallic crystalline-coil block copolymers in solution

Author affiliations

Abstract

We describe the stepwise hierarchical self-assembly of star-shaped organometallic crystalline-coil block copolymers with four arms, poly(ethylene oxide)-block-poly(ferrocenyldimethylsilane) [PEO50-b-PFDMSx]4, into anisotropic superstructures of up to several μm in length. The process takes place in mixtures of a common solvent for both blocks (THF) and a non-solvent for the organometallic PFDMS block (acetone, EtOH). In both cases, spherical intermediates could be identified via light scattering (DLS) and electron microscopic techniques (SEM, TEM, and cryo-TEM). Materials with weight fractions of PFDMS in the range of 64–80% have been used and, depending on the selective co-solvent, several “triggers” to induce the formation of anisotropic superstructures have been identified: the content of the selective co-solvent (acetone, EtOH), the temperature (EtOH), and the overall star block copolymer concentration (EtOH). In addition, the processes are, to a certain extent, reversible. Whereas in THF–EtOH solvent mixtures crystalline vesicles seem to serve as intermediate building blocks, in the case of THF–acetone mixtures large-compound micelles without any intrinsic fine structure are observed initially. Nevertheless, after further agglomeration into superstructures, an undulated tubular morphology is observed and a partially crystalline nature can be confirmed by X-ray analysis (WAXS).

Graphical abstract: Hierarchical self-assembly of star-shaped organometallic crystalline-coil block copolymers in solution

Article information


Submitted
01 Feb 2012
Accepted
20 Apr 2012
First published
28 May 2012

Soft Matter, 2012,8, 6968-6978
Article type
Paper

Hierarchical self-assembly of star-shaped organometallic crystalline-coil block copolymers in solution

F. H. Schacher, U. Freier and F. Steiniger, Soft Matter, 2012, 8, 6968 DOI: 10.1039/C2SM25245G

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.


Social activity

Search articles by author

Spotlight

Advertisements