Phase behavior of deuterated polystyrene-block-poly(n-pentyl methacrylate) copolymers

Du Yeol Ryu, Unyong Jeong, Dong Hyun Lee, Jehan Kim, Hwa Shik Youn, Jin Kon Kim

Research output: Contribution to journalArticle

60 Citations (Scopus)

Abstract

The phase behavior of deuterated polystyrene-block-poly(n-pentyl methacrylate) copolymers (dPS-PnPMA) was investigated by using small-angle X-ray (SAXS) and neutron (SANS) scatterings and rheology. This block copolymer exhibited a closed-loop type of phase behavior as did hydrogenated PS-PnPMA copolymers. The closed loop consists of two transitions: lower disorder-to-order transition (LDOT) and upper order-to-disorder transition (UODT) occurring at a lower and higher temperature, respectively. The segmental interaction parameter (χ) between dPS and PnPMA blocks at various temperatures was obtained by fitting the incompressible random phase approximation theory to SANS results using a low molecular weight of dPS-PnPMA exhibiting a disordered homogeneous state over the entire temperature range. We found that at higher temperatures χ increased initially with increasing temperature (T), achieved a maximum, and then decreased. Such behavior is in keeping with polymer blends or block copolymers that would exhibit a closed-loop phase behavior. However, at temperatures below LDOT, χ did not decrease monotonically with decreasing T. Rather, with decreasing T, χ decreased initially, achieved a minimum, and then increased again. This strongly suggests that another transition of order-to-disorder transition (ODT) might be expected at lower temperatures.

Original languageEnglish
Pages (from-to)2894-2902
Number of pages9
JournalMacromolecules
Volume36
Issue number8
DOIs
Publication statusPublished - 2003 Apr 22

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Methacrylates
Polystyrenes
Phase behavior
Copolymers
Temperature
Block copolymers
Approximation theory
Polymer blends
Neutron scattering
Rheology
Molecular weight
X rays

All Science Journal Classification (ASJC) codes

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

Cite this

Ryu, Du Yeol ; Jeong, Unyong ; Lee, Dong Hyun ; Kim, Jehan ; Youn, Hwa Shik ; Kim, Jin Kon. / Phase behavior of deuterated polystyrene-block-poly(n-pentyl methacrylate) copolymers. In: Macromolecules. 2003 ; Vol. 36, No. 8. pp. 2894-2902.
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Phase behavior of deuterated polystyrene-block-poly(n-pentyl methacrylate) copolymers. / Ryu, Du Yeol; Jeong, Unyong; Lee, Dong Hyun; Kim, Jehan; Youn, Hwa Shik; Kim, Jin Kon.

In: Macromolecules, Vol. 36, No. 8, 22.04.2003, p. 2894-2902.

Research output: Contribution to journalArticle

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