Transition behavior of weakly interacting PS-b-PMMA films on preferential surfaces: A direct observation by GISAXS

Eunhye Kim, Hyungju Ahn, Du Yeol Ryu, Jehan Kim, Junhan Cho

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

The phase transitions for the films of a symmetric poly styrene-b-poly (methyl methacryltate) (PS-b-PMMA) on a modified surface, like the order-to-disorder transition (ODT) in the weak segregation regime, was investigated by in situ grazing incidence small-angle X-ray scattering (GISAXS). The selective interactions at the surface by PS-brush substrate that favors the preferential interactions with the PS component of the block copolymer enhance the parallel orientation of the lamellar microdomains to the film surface. This effect for weakly interacting PS-b-PMMA films leads to a gentle decrease of the transition temperature with increasing film thickness up to 50L0 (lamellar period). We discuss this thickness dependence of transition temperatures for PS-b-PMMA films on preferential surfaces in terms of the temperature dependence of γbetween two block components.

Original languageEnglish
Pages (from-to)8385-8391
Number of pages7
JournalMacromolecules
Volume42
Issue number21
DOIs
Publication statusPublished - 2009 Nov 10

Fingerprint

Styrene
X ray scattering
Superconducting transition temperature
Brushes
Block copolymers
Film thickness
Phase transitions
Substrates
Temperature

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

Cite this

Kim, Eunhye ; Ahn, Hyungju ; Ryu, Du Yeol ; Kim, Jehan ; Cho, Junhan. / Transition behavior of weakly interacting PS-b-PMMA films on preferential surfaces : A direct observation by GISAXS. In: Macromolecules. 2009 ; Vol. 42, No. 21. pp. 8385-8391.
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Transition behavior of weakly interacting PS-b-PMMA films on preferential surfaces : A direct observation by GISAXS. / Kim, Eunhye; Ahn, Hyungju; Ryu, Du Yeol; Kim, Jehan; Cho, Junhan.

In: Macromolecules, Vol. 42, No. 21, 10.11.2009, p. 8385-8391.

Research output: Contribution to journalArticle

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