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Hybrid Janus particles based on polymer-modified kaolinite

Title data

Weiss, Stephan ; Hirsemann, Dunja ; Biersack, Bernhard ; Ziadeh, Mazen ; Müller, Axel H. E. ; Breu, Josef:
Hybrid Janus particles based on polymer-modified kaolinite.
In: Polymer. Vol. 54 (18 February 2013) Issue 4 . - pp. 1388-1396.
ISSN 0032-3861
DOI: https://doi.org/10.1016/j.polymer.2012.12.041

Abstract in another language

Janus particles are superior to ordinary Pickering emulsifiers. Widespread industrial usage is however hampered by the restricted accessibility of these polar colloids. Whereas established synthesis protocols that allow for breaking the symmetry of colloid surfaces are laborious and expensive, here we use Janus particles that are based on the ubiquitous layered silicate kaolinite. As a consequence of its crystal structure, the two opposing basal planes, the tetrahedral (TS) and the octahedral (OS) surface, are capped by distinct functional groups. We show that these chemically different basal surfaces allow for facile selective modification making them compatible with e.g. polystyrene (PS) and poly(methyl methacrylate) (PMMA), respectively. The TS was selectively modified by simple cation exchange with poly(2-(dimethylamino)ethyl methacrylate) polycations attached to a polystyrene block while on the OS PMMA chains were covalently anchored via statistically distributed catechol groups. Solid-state NMR proved successful modification, while TGA was provided the amount of polymer bound to both external basal surfaces of kaolinite. Moreover, the selective nature of the modification was proven indirectly by qualitatively comparing the sedimentation stability of suspensions of differently modified samples. These Janus particles with fine-tuned surface tension of the opposing hemispheres were tested on their interfacial activity in solvent-cast films of PS–PMMA blends. The assembly of the Janus particles at the interfaces of the blend was proven by transmission electron microscopy.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Polymer–clay hybrids; Polymer blend; Janus particles
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Anorganic Chemistry I > Chair Anorganic Chemistry I - Univ.-Prof. Dr. Josef Breu
Research Institutions > Collaborative Research Centers, Research Unit
Research Institutions > Collaborative Research Centers, Research Unit > SFB 840 Von partikulären Nanosystemen zur Mesotechnologie > SFB 840 - TP A 6
Graduate Schools > Elite Network Bavaria > Struktur, Reaktivität und Eigenschaften Oxidischer Materialien
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Anorganic Chemistry I
Research Institutions
Research Institutions > Collaborative Research Centers, Research Unit > SFB 840 Von partikulären Nanosystemen zur Mesotechnologie
Graduate Schools
Graduate Schools > Elite Network Bavaria
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
Date Deposited: 20 Mar 2018 14:09
Last Modified: 20 Mar 2018 14:09
URI: https://eref.uni-bayreuth.de/id/eprint/9283