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Modification of a polystyrene brush layer by insertion of poly(methyl methacrylate) molecules
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Image of FIG. 1.
FIG. 1.

(Color online) Water contact angles of PS brushes before any modification, PS brushes modified with PMMA-OH , and PS brushes treated with PMMA .

Image of FIG. 2.
FIG. 2.

NEXAFS spectra of (a) PS and PMMA reference samples and (b) PS-OH brush modified with PMMA-OH (S3M20).

Image of FIG. 3.
FIG. 3.

(Color online) Thickness of PS brushes before and after PMMA-OH modification, as a function of molecular weight of PS. The brush thickness increased as PMMA-OH was inserted into the PS brush.

Image of FIG. 4.
FIG. 4.

(a) Chain densities of PS-OH and PMMA-OH in the final brushes. (b) PMMA-OH chain density as a function of PS initial brush thickness. (c) The ratio of PS in the final blend brush, , on the substrate. Shadow area highlights nonpreferential wetting brush compositions.

Image of FIG. 5.
FIG. 5.

Top down SEM images of self-assembled P(S- -MMA) films on brushes: (a) S3M20, (b) S6M20, (c) S9M20, and (d) S20M20. On brushes S3M20 and S6M20, P(S- -MMA) formed fingerprints only, indicating that these brushes were nonpreferential to PS and PMMA. Partial parallel lamellae formed on PS-preferential wetting brushes S9M20 and S20M20. All SEM micrographs represent a area.

Image of FIG. 6.
FIG. 6.

NEXAFS spectrum of PMMA-OH brush modified with PS-OH (M20S3), and the corresponding fitting to determine PS fraction in the final brush.


Generic image for table

Molecular weight and polydispersity index of the polymers used.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Modification of a polystyrene brush layer by insertion of poly(methyl methacrylate) molecules