Measurement of Gyroid single grain growth rates in block copolymer solutions

Thomas Q. Chastek, Timothy P. Lodge

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

The kinetics of grain growth during thermally induced phase transitions between two block copolymer ordered phases have been determined by polarized optical microscopy (POM). Measurements were made on poly(styrene-b-isoprene) copolymers, fPS = 0.3-0.6, in solutions with dialkyl phthalates at polymer volume fractions of 0.5-0.7. When these solutions are cooled from a disordered state, they exhibit a transition from the transient metastable hexagonally perforated layer (HPL) phase to the gyroid (G) phase. The HPL to G transition typically occurs through classical nucleation, with radially symmetric grain growth, making it a model system for quantifying the growth front velocities of individual G grains. Temperature jump experiments monitored with POM were used to determine the effect of quench depth on the grain growth rates. Grain growth rates are compared quantitatively to the theoretical predictions of Goveas and Milner, with good agreement observed.

Original languageEnglish (US)
Pages (from-to)7672-7680
Number of pages9
JournalMacromolecules
Volume36
Issue number20
DOIs
StatePublished - Oct 7 2003

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