Phase transition and phase transformation in block copolymer nanoparticles

Takeshi Higuchi, Kiwamu Motoyoshi, Hidekazu Sugimori, Hiroshi Jinnai, Hiroshi Yabu, Masatsugu Shimomura

Research output: Contribution to journalArticlepeer-review

74 Citations (Scopus)

Abstract

Block copolymer nanopaticles were prepared from the mixture solutions containing good/poor solvents by a simple evaporation process. The block copolymers formed disorder, unidirectionally stacked lamellar, and onion-like structures in nanoparticles depending on preparation temperatures. Thermal annealing induced the disorder-order phase transition and order-order phase transformation in the block copolymer nanoparticles, even though the annealing temperature is lower than the of one polymer segment. The unusual thermal behaviors suggest that the glass transition temperature of the block copolymer is decreased by the effect of nanoparticle, whose surface areas are larger than their volumes. Block copolymer nanoparticles were prepared from the mixture solutions containing good/poor solvents by a simple evaporation process. Thermal annealing induced the disorder"order phase transition and order"order phase transformation in the block copolymer nanoparticles, even though the annealing temperature is lower than that of one polymer segment. The unusual thermal behaviors suggest that the glass transition temperature of the block copolymer is decreased by the effect of nanoparticle.

Original languageEnglish
Pages (from-to)1773-1778
Number of pages6
JournalMacromolecular Rapid Communications
Volume31
Issue number20
DOIs
Publication statusPublished - 2010 Oct 18

Keywords

  • Block copolymer
  • Microphase separation structure
  • Nanoparticle
  • Phase transformation
  • Phase transition

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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