Structural Instabilities in Lamellar Diblock Copolymer Thin Films During Solvent Vapor Uptake
- 18 November 2008
- journal article
- letter
- Published by American Chemical Society (ACS) in Langmuir
- Vol. 24 (24), 13815-13818
- https://doi.org/10.1021/la802656a
Abstract
We have studied the structural rearrangements in a lamellae-forming poly(styrene-b-butadiene) film during exposure to toluene vapor. Real-time, in situ grazing-incidence small-angle X-ray scattering allowed us to identify distinct kinetic regimes: First, the lamellae swell linearly, and the blocks stretch uniaxially. Then, the blocks relax to a more globular molecular conformation, and the lamellar thickness abruptly shrinks again. The increased interfacial area culminates in a dramatic instability causing a major rearrangement of the lamellar stack and the formation of new lamellae. Finally, the lamellar thickness levels off, and the interfaces flatten again.Keywords
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