The effect of molecular architecture on the grain growth kinetics of A nEn star block copolymers

Xiaochuan Hu, Yuqing Zhu, Samuel P. Gido, Thomas P. Russell, Hermis Iatrou, Nikos Hadjichristidis, Ferass M. Abuzaina, Bruce Garetz

Research output: Contribution to journalArticle

Abstract

To investigate the effect of molecular architecture on the grain growth kinetics of star block copolymers, a series of AnBn miktoarm star block copolymers with different numbers of arms (n = 1, 2, 4 and 16) was studied. Across this entire series of materials, all the A arms are polystyrene (PS) blocks from the same anionically synthesized batch, and thus all the A arms are identical. Likewise, all the B arms are polyisoprene (PI) blocks from the same anionically synthesized batch, and thus all the B arms are identical. All the stars employed in this study are therefore composed of the same A and B arms liked together in symmetric numbers. The coarsening kinetics of grain growth was monitored in real space by transmission electron microscopy (TEM), followed by subsequent micrograph image analysis. It was found that the molecular architecture influenced the grain growth kinetics of these A nBn star copolymers dramatically. The grain coarsening kinetics was found to follow a scaling law as V ∼ tB, where V is the characteristic grain volume and t is time. The exponent, β, was found to be about 0.2 for the diblock copolymer (n = 1) and 0.4 for all three of the star block copolymers (n = 2, 4 and 16) in the series. It is postulated that the difference in grain growth rate between the diblock and the various stars is due to a reduction in molecular entanglements resulting from chain stretching near the junction points in the stars.

Original languageEnglish (US)
Pages (from-to)103-112
Number of pages10
JournalFaraday Discussions
Volume128
DOIs
StatePublished - 2005

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Growth kinetics
block copolymers
Grain growth
Block copolymers
Stars
stars
kinetics
Coarsening
copolymers
polyisoprenes
Polyisoprenes
Scaling laws
Polystyrenes
image analysis
scaling laws
Image analysis
Stretching
polystyrene
Copolymers
exponents

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

The effect of molecular architecture on the grain growth kinetics of A nEn star block copolymers. / Hu, Xiaochuan; Zhu, Yuqing; Gido, Samuel P.; Russell, Thomas P.; Iatrou, Hermis; Hadjichristidis, Nikos; Abuzaina, Ferass M.; Garetz, Bruce.

In: Faraday Discussions, Vol. 128, 2005, p. 103-112.

Research output: Contribution to journalArticle

Hu, X, Zhu, Y, Gido, SP, Russell, TP, Iatrou, H, Hadjichristidis, N, Abuzaina, FM & Garetz, B 2005, 'The effect of molecular architecture on the grain growth kinetics of A nEn star block copolymers', Faraday Discussions, vol. 128, pp. 103-112. https://doi.org/10.1039/b403881a
Hu, Xiaochuan ; Zhu, Yuqing ; Gido, Samuel P. ; Russell, Thomas P. ; Iatrou, Hermis ; Hadjichristidis, Nikos ; Abuzaina, Ferass M. ; Garetz, Bruce. / The effect of molecular architecture on the grain growth kinetics of A nEn star block copolymers. In: Faraday Discussions. 2005 ; Vol. 128. pp. 103-112.
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