Mechanism of morphological transition from lamellar/perforated layer to gyroid phases

Jong-Hyun Ahn, Wang Cheol Zin

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

We investigated epitaxial relations of phase transitions between the lamellar (L), hexagonally perforated layers (HPL), and gyroid (G) morphologies in styrene-isoprene diblock copolymer (PSI) and polyisoprene (PI)/PSI blend using rheology and small angle X-ray scattering (SAXS) techniques. In HPL→G transitions, six spot patterns of G phase were observed in two-dimensitional SAXS pattern. On the other hand, in direct L→G transition without appearance of HPL phase, the polydomain patterns of G phase were observed. From present study, it was understood that direct L→G transition of blend may be suppressed by high-energy barrier of transition and mismatches in domain orientation between epitaxially related lattice planes.

Original languageEnglish
Pages (from-to)152-156
Number of pages5
JournalMacromolecular Research
Volume11
Issue number3
DOIs
Publication statusPublished - 2003 Jan 1

Fingerprint

X ray scattering
Polyisoprenes
Isoprene
Styrene
Energy barriers
Rheology
Block copolymers
Phase transitions
isoprene

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

Cite this

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abstract = "We investigated epitaxial relations of phase transitions between the lamellar (L), hexagonally perforated layers (HPL), and gyroid (G) morphologies in styrene-isoprene diblock copolymer (PSI) and polyisoprene (PI)/PSI blend using rheology and small angle X-ray scattering (SAXS) techniques. In HPL→G transitions, six spot patterns of G phase were observed in two-dimensitional SAXS pattern. On the other hand, in direct L→G transition without appearance of HPL phase, the polydomain patterns of G phase were observed. From present study, it was understood that direct L→G transition of blend may be suppressed by high-energy barrier of transition and mismatches in domain orientation between epitaxially related lattice planes.",
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Mechanism of morphological transition from lamellar/perforated layer to gyroid phases. / Ahn, Jong-Hyun; Zin, Wang Cheol.

In: Macromolecular Research, Vol. 11, No. 3, 01.01.2003, p. 152-156.

Research output: Contribution to journalArticle

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