Journal Article

PUBDB-2017-14139

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Effects of nanoparticles on phase morphology in thin films of phase-separated diblock copolymers

Jehnichen, D. (Corresponding author)Extern* ; Pospiech, D.Extern* ; Friedel, P.Extern* ; Horechyy, A.Extern* ; Korwitz, A.Extern* ; Janke, A. ; Näther, F. ; Papadakis, C. M.Extern* ; Perlich, J.Extern* ; Neu, V.

2017
Cambridge Univ. Press Cambridge

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Please use a persistent id in citations: doi:10.1017/S0885715616000762

Abstract: This study investigates the morphology changes in thin diblock copolymer (DiBCP) films occurring in the interaction with modified nanoparticles (NPs). Magnetite (Fe$_3$O$_4$) and silica (SiO $_x$ ) were prepared and used. Poly(pentyl methacrylate-b-methyl methacrylate) (PPMA-b-PMMA) (70/30 mol mol−1, hcp cylinders of the PMMA phase) DiBCP were employed to prepare thin films having thicknesses to realize standing cylinders in pure DiBCP films. The investigations aimed at two topics: (1) morphology after controlled incorporation of organo-modified NP (gold, silver, Fe$_3$O$_4$, SiO $_x$ ) and (2) additional solvent vapour annealing (SVA) with tetrahydrofuran (and chloroform for comparison). The laterally ordered morphology in thin films was examined by GISAXS and atomic force microscopy. Keeping the same type of morphology in nanocomposites, the dimensions of the periodic nanostructure altered depending on type and amount of incorporated NP. It was found that SiO $_x$ clusters enlarge the lateral distance of the PMMA cylinders, whereas metallic NPs reduce this parameter. Applying SVA improves the phase separation slightly, whereas lateral distances were kept constant or were reduced a little. Switching of domain orientation upon SVA could not be detected in the presence of NPs located at the polymer/substrate interface.

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Contributing Institute(s):

1. DOOR-User (DOOR)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)

Experiment(s):

1. DORIS Beamline A2 (DORIS III)
2. DORIS Beamline BW4 (DORIS III)

Appears in the scientific report 2017

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Database coverage:
; Allianz-Lizenz / DFG ; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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