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01.09.2014 | Original Contribution

Nanoparticle directed domain orientation in thin films of asymmetric block copolymers

verfasst von: Andriy Horechyy, Bhanu Nandan, Nikolaos E. Zafeiropoulos, Dieter Jehnichen, Michael Göbel, Manfred Stamm, Doris Pospiech

Erschienen in: Colloid and Polymer Science | Ausgabe 9/2014

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Abstract

We investigated the thin film morphology of two different asymmetric block copolymers (BCP), polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) and poly(n-pentyl methacrylate)-block-poly(methyl methacrylate) (PPMA-b-PMMA), loaded with pre-synthesized iron oxide nanoparticles (NP). The chemical composition of the BCP constituents determines the strength of the interaction between polymer chains and nanoparticles. In the case of NP/PS-b-P4VP system, the nanoparticles interact preferentially with the P4VP block and hence localize selectively in the P4VP cylindrical microdomains. However, for the NP/PPMA-b-PMMA system, the nanoparticles have no significant preference for the copolymer blocks and segregate at the polymer/substrate interface. Interestingly, this changes the effective substrate surface energy and hence leads to a remarkable change in domain orientation from parallel to perpendicular with respect to the substrate. These results clearly demonstrate the importance of both enthalpic and entropic factors which determine spatial distribution of NP in BCP films and influence domain orientation.

Vorheriger Artikel Solidification of non-halogen fire-retardant liquids by encapsulation within porous uniform PDVB microspheres for preparation of fire-retardant polymeric blends

Nächster Artikel Acceleration of protein decomposition by photocatalytic Ti(IV)-doped calcium hydroxyapatite particles and its application for reduction of pathogenic proteins

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Titel: Nanoparticle directed domain orientation in thin films of asymmetric block copolymers
verfasst von: Andriy Horechyy
Bhanu Nandan
Nikolaos E. Zafeiropoulos
Dieter Jehnichen
Michael Göbel
Manfred Stamm
Doris Pospiech
Publikationsdatum: 01.09.2014
Verlag: Springer Berlin Heidelberg
Erschienen in: Colloid and Polymer Science / Ausgabe 9/2014
Print ISSN: 0303-402X
Elektronische ISSN: 1435-1536
DOI: https://doi.org/10.1007/s00396-014-3251-7

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