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Kim, So Youn
Laboratory for Soft Materials Nanophysics
Research Interests
  • Colloids, particle dispersions, polymer nanocomposite, block copolymers

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Polystyrene-poly(2-ethylhexylmethacrylate) block copolymers: Synthesis, bulk phase behavior, and thin film structure

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Title
Polystyrene-poly(2-ethylhexylmethacrylate) block copolymers: Synthesis, bulk phase behavior, and thin film structure
Author
Kwon, Ha-KyungLopez, Vanessa E.Davis, Raleigh L.Kim, So YounBurns, Adam B.Register, Richard A.
Keywords
Block copolymer; Phase behavior; Thin film
Issue Date
2014-04
Publisher
ELSEVIER SCI LTD
Citation
POLYMER, v.55, no.8, pp.2059 - 2067
Abstract
Anionic polymerization was employed to synthesize well-defined diblock copolymers of polystyrene and poly(2-ethylhexylmethacrylate), PS-PEHMA. Diblock morphologies in bulk and in substrate-supported thin films were characterized by small-angle X-ray scattering (SAXS) and atomic force microscopy (AFM), respectively. PS-PEHMA diblocks exhibited thermotropic order-disorder transitions; one diblock showed a thermoreversible transition between lamellae and a higher-temperature morphology assigned as perforated lamellae. Unlike PS-poly(alkylmethacrylate) diblocks where the alkyl group is n-butyl or n-pentyl, PS-PEHMA diblocks showed a typical decreasing Flory interaction parameter with increasing temperature. Thin films of PS-cylinder-forming PS-PEHMA diblocks showed a strong preference for the cylinders to lie in the plane of the film; films of incommensurate thickness readily formed terraces. Films of commensurate thickness were easily aligned over macroscopic areas through the application of mechanical shear.
URI
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DOI
10.1016/j.polymer.2014.02.047
ISSN
0032-3861
Appears in Collections:
ECHE_Journal Papers
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