Transition behavior of asymmetric polystyrene-b-poly(2-vinylpyridine) films: A stable hexagonally modulated layer structure

Sungmin Park, Kyosung Koo, Kyunginn Kim, Hyungju Ahn, Byeongdu Lee, Cheolmin Park, Du Yeol Ryu

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The phase transitions in the films of an asymmetric polystyrene-b-poly(2-vinylpyridine) (PS-b-P2VP) were investigated by grazing incidence small-angle X-ray scattering (GISAXS) and transmission electron microscopy (TEM). Compared with the sequential transitions in the bulk, hexagonally perforated layer (HPL) - gyroid (GYR) - disorder (DIS) upon heating, the transitions in film geometry were dramatically changed with decreasing thickness due to the growing preferential interactions from substrate, resulting in a thickness-dependent transition diagram including four different morphologies of hexagonally modulated layer (HML), coexisting (HML and GYR), GYR, and DIS. Particularly in the films ≤ 10Lo, where Lois d-spacing at 150°C, a stable HML structure was identified even above the order-to-disorder transition (ODT) temperature of the bulk, which was attributed to the suppressed compositional fluctuations by the enhanced substrate interactions.

Original languageEnglish
Pages (from-to)32-39
Number of pages8
JournalPolymer
Volume60
DOIs
Publication statusPublished - 2015 Mar 9

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Polystyrenes
Substrates
X ray scattering
Superconducting transition temperature
Phase transitions
Transmission electron microscopy
Heating
Geometry
poly(2-vinylpyridine)

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

Cite this

Park, Sungmin ; Koo, Kyosung ; Kim, Kyunginn ; Ahn, Hyungju ; Lee, Byeongdu ; Park, Cheolmin ; Ryu, Du Yeol. / Transition behavior of asymmetric polystyrene-b-poly(2-vinylpyridine) films : A stable hexagonally modulated layer structure. In: Polymer. 2015 ; Vol. 60. pp. 32-39.
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Transition behavior of asymmetric polystyrene-b-poly(2-vinylpyridine) films : A stable hexagonally modulated layer structure. / Park, Sungmin; Koo, Kyosung; Kim, Kyunginn; Ahn, Hyungju; Lee, Byeongdu; Park, Cheolmin; Ryu, Du Yeol.

In: Polymer, Vol. 60, 09.03.2015, p. 32-39.

Research output: Contribution to journalArticle

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T1 - Transition behavior of asymmetric polystyrene-b-poly(2-vinylpyridine) films

T2 - A stable hexagonally modulated layer structure

AU - Park, Sungmin

AU - Koo, Kyosung

AU - Kim, Kyunginn

AU - Ahn, Hyungju

AU - Lee, Byeongdu

AU - Park, Cheolmin

AU - Ryu, Du Yeol

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N2 - The phase transitions in the films of an asymmetric polystyrene-b-poly(2-vinylpyridine) (PS-b-P2VP) were investigated by grazing incidence small-angle X-ray scattering (GISAXS) and transmission electron microscopy (TEM). Compared with the sequential transitions in the bulk, hexagonally perforated layer (HPL) - gyroid (GYR) - disorder (DIS) upon heating, the transitions in film geometry were dramatically changed with decreasing thickness due to the growing preferential interactions from substrate, resulting in a thickness-dependent transition diagram including four different morphologies of hexagonally modulated layer (HML), coexisting (HML and GYR), GYR, and DIS. Particularly in the films ≤ 10Lo, where Lois d-spacing at 150°C, a stable HML structure was identified even above the order-to-disorder transition (ODT) temperature of the bulk, which was attributed to the suppressed compositional fluctuations by the enhanced substrate interactions.

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