Order-to-order transitions of block copolymer in film geometry

Changhak Shin, Du Yeol Ryu, June Huh, Jung-Hyun Kim, Kwang Woo Kim

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

The various mesophasic transitions for an asymmetric polystyrene-block- polyisoprene (PS-b-PI) in film geometry, like the order-to-order transitions, were investigated by in situ grazing incidence small-angle X-ray scattering (GISAXS). Compared with the sequential phase transitions in bulk, lamella (LAM) to hexagonally perforated layer (HPL) to gyroid (GYR) to hexagonally packed cylinder (HEX) to disorder (DIS) by thermal energy, the only difference in geometry leads to the enhancement of LAM phase, the parallel shifts of transition temperatures for HPL and GYR phases, and a little increase of order-to-disorder temperature (TODT)asa consequence of weak interfacial interactions. However, a short-range of HEX phase in bulk disappears. These results may be correlated to the suppressed compositional fluctuation in film geometry due to the interactions of polyisoprene block with the substrate and air.

Original languageEnglish
Pages (from-to)2157-2160
Number of pages4
JournalMacromolecules
Volume42
Issue number6
DOIs
Publication statusPublished - 2009 Mar 24

Fingerprint

Block copolymers
Polyisoprenes
Geometry
Thermal energy
X ray scattering
Superconducting transition temperature
Polystyrenes
Phase transitions
Substrates
Air
Temperature
polystyrene-block-polyisoprene

All Science Journal Classification (ASJC) codes

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

Cite this

Shin, Changhak ; Ryu, Du Yeol ; Huh, June ; Kim, Jung-Hyun ; Kim, Kwang Woo. / Order-to-order transitions of block copolymer in film geometry. In: Macromolecules. 2009 ; Vol. 42, No. 6. pp. 2157-2160.
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Order-to-order transitions of block copolymer in film geometry. / Shin, Changhak; Ryu, Du Yeol; Huh, June; Kim, Jung-Hyun; Kim, Kwang Woo.

In: Macromolecules, Vol. 42, No. 6, 24.03.2009, p. 2157-2160.

Research output: Contribution to journalArticle

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AB - The various mesophasic transitions for an asymmetric polystyrene-block- polyisoprene (PS-b-PI) in film geometry, like the order-to-order transitions, were investigated by in situ grazing incidence small-angle X-ray scattering (GISAXS). Compared with the sequential phase transitions in bulk, lamella (LAM) to hexagonally perforated layer (HPL) to gyroid (GYR) to hexagonally packed cylinder (HEX) to disorder (DIS) by thermal energy, the only difference in geometry leads to the enhancement of LAM phase, the parallel shifts of transition temperatures for HPL and GYR phases, and a little increase of order-to-disorder temperature (TODT)asa consequence of weak interfacial interactions. However, a short-range of HEX phase in bulk disappears. These results may be correlated to the suppressed compositional fluctuation in film geometry due to the interactions of polyisoprene block with the substrate and air.

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