Closed-loop phase behavior for weakly interacting block copolymers

Chaoxu Li, Dong Hyun Lee, Jin Kon Kim, Du Yeol Ryu, Thomas P. Russell

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


Polystyrene-block-poly(n-butyl methacrylate) copolymer (PS-b-PnBMA) exhibits only a lower disorder-to-order transition (LDOT), not a closed-loop phase behavior, within an experimentally accessible temperature range. But, when mixed solvents of di-n-octyl phthalate and hexadecane were added to PS-b-PnBMA, this mixture exhibited the upper order-to-disorder transition (UODT) below the degradation temperature as well as an LDOT above the glass transition temperatures of both blocks; thus, a close-loop phase behavior was observed. These results suggest that the closed-loop phase behavior may be a general phenomenon for weakly interacting polystyrene-block-poly(n-alkyl methacrylate) copolymers with LDOT.

Original languageEnglish
Pages (from-to)5926-5930
Number of pages5
Issue number17
Publication statusPublished - 2006 Aug 22

All Science Journal Classification (ASJC) codes

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


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