Closed-loop phase behaviour in block copolymers

Du Yeol Ryu, Unyong Jeong, Jin Kon Kim, Thomas P. Russell

Research output: Contribution to journalArticle

98 Citations (Scopus)

Abstract

Closed-loop phase diagrams are known in systems with specific intermolecular interactions. In weakly interacting systems, however, such behaviour has never been observed. Here, diblock copolymers formed from polystyrene covalently linked to poly (n-pentylmethacrylate), P(S-b-nPMA), which have only weak segmental interactions, are shown to exhibit a closed-loop phase behaviour over a narrow range of molecular weight. The endothermic transitions from the disordered to ordered and back to the disordered state, as a function of increasing temperature, are dominantly entropie morigin.The morphology and rheological properties of P(S-b-nPMA) undergo characteristic changes at the transitions. Whereas the disorder-to-order transition temperature increases with decreasing molecular weight, the order-to-disorder transition temperature decreases. At a limiting molecular weight, the closed-loop vanishes and no ordering occurs. These findings provide quantitative insight into an elusive transitionin weakly interacting multi component systems.

Original languageEnglish
Pages (from-to)114-117
Number of pages4
JournalNature materials
Volume1
Issue number2
DOIs
Publication statusPublished - 2002 Jan 1

Fingerprint

Phase behavior
block copolymers
Block copolymers
molecular weight
Molecular weight
Superconducting transition temperature
transition temperature
disorders
Polystyrenes
Phase diagrams
polystyrene
copolymers
phase diagrams
interactions
Temperature
temperature

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Ryu, Du Yeol ; Jeong, Unyong ; Kim, Jin Kon ; Russell, Thomas P. / Closed-loop phase behaviour in block copolymers. In: Nature materials. 2002 ; Vol. 1, No. 2. pp. 114-117.
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Ryu, DY, Jeong, U, Kim, JK & Russell, TP 2002, 'Closed-loop phase behaviour in block copolymers', Nature materials, vol. 1, no. 2, pp. 114-117. https://doi.org/10.1038/nmat724

Closed-loop phase behaviour in block copolymers. / Ryu, Du Yeol; Jeong, Unyong; Kim, Jin Kon; Russell, Thomas P.

In: Nature materials, Vol. 1, No. 2, 01.01.2002, p. 114-117.

Research output: Contribution to journalArticle

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