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Burghardt, Wesley R.
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Publications (7/7 displayed)
- 2009Melt rheology and x-ray analysis of gradient copolymers
- 2008Microphase separation and shear alignment of gradient copolymerscitations
- 2007Shear flow behavior of a dynamically symmetric polymeric bicontinuous microemulsioncitations
- 2002Linear viscoelasticity of a polymeric bicontinuous microemulsioncitations
- 2002Thermoreversible, Epitaxial [Formula presented] Transitions in Block Copolymer Solutionscitations
- 2002Time-resolved small-angle x-ray scattering measurements of a polymer bicontinuous microemulsion structure factor under shearcitations
- 2002Effects of shear flow on a polymeric bicontinuous microemulsioncitations
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article
Thermoreversible, Epitaxial [Formula presented] Transitions in Block Copolymer Solutions
Abstract
<p>Uncharged block copolymer micelles display thermoreversible transitions between close-packed and bcc lattices for a range of concentration, solvent selectivity, and copolymer composition. Using small-angle x-ray scattering on shear-oriented solutions, highly aligned fcc crystals are seen to transform epitaxially to bcc crystals, with fcc/bcc orientational relationships that are well established in martensitic transformations in metals. The transition is driven by decreasing solvent selectivity with increasing temperature, inducing solvent penetration of the micellar core.</p>