Effective interaction parameter for homologous series of deuterated polystyrene-block-poly(n-alkyl methacrylate) copolymers

Du Yeol Ryu, Changhak Shin, Junhan Cho, Dong Hyun Lee, Jin Kon Kim, Kristopher A. Lavery, Thomas P. Russell

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

The effective interaction parameters, (χ F ) of the homologous series of deuterated polystyrene-block-poly(n-alkyl methacrylate) copolymers (dPS-b-PA n MA) from methyl (n = 1) to hexyl (n = 6) side groups have been investigated by small-angle neutron scattering and a Hartree (fluctuation correction) analysis. While χ F for dPS-b-PA n MA with n = 1 and 6 is a typical decreasing function of temperature, it is shown that χ F for n from 2 to 4 changes to a monotonic increase with temperature, revealing growing upward convexity. This action culminates in a maximum of χ F for n = 5, which suggests an immiscibility loop-type behavior. Using the Hartree analysis for compressible diblock copolymers, the effect of directional interactions and the compressibility difference between the constituent blocks on χ F is discussed. The ordering transition temperatures, their pressure dependences, and χ F for the homologous block copolymer series are shown to be in good agreement with the experimental values.

Original languageEnglish
Pages (from-to)7644-7655
Number of pages12
JournalMacromolecules
Volume40
Issue number21
DOIs
Publication statusPublished - 2007 Oct 16

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Methacrylates
Polystyrenes
Block copolymers
Copolymers
Neutron scattering
Compressibility
Superconducting transition temperature
Solubility
Temperature

All Science Journal Classification (ASJC) codes

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

Cite this

Ryu, Du Yeol ; Shin, Changhak ; Cho, Junhan ; Lee, Dong Hyun ; Kim, Jin Kon ; Lavery, Kristopher A. ; Russell, Thomas P. / Effective interaction parameter for homologous series of deuterated polystyrene-block-poly(n-alkyl methacrylate) copolymers. In: Macromolecules. 2007 ; Vol. 40, No. 21. pp. 7644-7655.
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Effective interaction parameter for homologous series of deuterated polystyrene-block-poly(n-alkyl methacrylate) copolymers. / Ryu, Du Yeol; Shin, Changhak; Cho, Junhan; Lee, Dong Hyun; Kim, Jin Kon; Lavery, Kristopher A.; Russell, Thomas P.

In: Macromolecules, Vol. 40, No. 21, 16.10.2007, p. 7644-7655.

Research output: Contribution to journalArticle

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