Neutral wetting brush layers for block copolymer thin films using homopolymer blends

Diego Antonioli, Katia Sparnacci, Michele Laus, Federico Ferrarese Lupi, Tommaso Jacopo Giammaria, Gabriele Seguini, Monica Ceresoli, Michele Perego, Valentina Gianotti

Risultato della ricerca: Capitolo in libro/report/atti di convegnoContributo a conferenzapeer review

Abstract

Binary homopolymer blends of two hydroxyl-terminated polystyrene (PS-OH) and polymethylmethacrylate (PMMA-OH) homopolymers (Mn ∼ 16000 g mol-1) were grafted on SiO2 substrates by high-temperature (T > 150 °C), short-time (t < 600 s) thermal treatments. The resulting brush layer was tested to screen preferential interactions of the SiO2 substrate with the different symmetric and asymmetric PS-b-PMMA block copolymers deposited on top of the grafted molecules. By properly adjusting the blend composition and the processing parameters, an efficient surface neutralization path was identified, enabling the formation, in the block copolymer film, of homogeneous textures of lamellae or cylinders perpendicularly oriented with respect to the substrate. A critical interplay between the phase segregation of the homopolymer blends and their grafting process on the SiO2 was observed. In fact, the polar SiO2 is preferential for the PMMA-rich phase that forms a homogeneous layer on the substrate, while the PS-rich phase is located at the polymer-air interface. During the thermal treatment, phase segregation and grafting proceed simultaneously. Complete wetting of the PS rich phase on the PMMA rich phase leads to the formation of a PS/PMMA bilayer. In this case, the progressive diffusion of PS chains toward the polymer-SiO2 interface during the thermal treatment allows tuning of the brush layer composition.

Lingua originaleInglese
Titolo della pubblicazione ospiteVIII International Conference on "Times of Polymers and Composites"
Sottotitolo della pubblicazione ospiteFrom Aerospace to Nanotechnology
EditorAlberto D'Amore, Luigi Grassia, Domenico Acierno
EditoreAmerican Institute of Physics Inc.
ISBN (elettronico)9780735413900
DOI
Stato di pubblicazionePubblicato - 18 mag 2016
Evento8th International Conference on Times of Polymers and Composites: From Aerospace to Nanotechnology - Ischia, Naples, Italy
Durata: 19 giu 201623 giu 2016

Serie di pubblicazioni

NomeAIP Conference Proceedings
Volume1736
ISSN (stampa)0094-243X
ISSN (elettronico)1551-7616

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???event.eventtypes.event.conference???8th International Conference on Times of Polymers and Composites: From Aerospace to Nanotechnology
Paese/TerritorioItaly
CittàIschia, Naples
Periodo19/06/1623/06/16

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