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Shear-Induced Structure in Polymer Blends With Viscoelastic Asymmetry



Erik K. Hobbie, H Jeon, Haonan Wang, H W. Kim, D J. Stout, Charles C. Han


Light scattering and optical microscopy have been used to measure the morphology as a function of shear rate and composition in polymer blends with viscoelastic asymmetry in the melt components. The blends studied are immiscible mixtures of low-vinyl polybutadiene (PB) and high-vinyl polyisoprene (PI), where the vinyl content strongly influences the rheological properties of the melt. At 130 oC, where the optical measurements described here were performed, the PI starts to exhibit an elastic response above a critical shear rate , while the PB responds like a viscous fluid up to shear rates exceeding 100 s-1. The disparate rheology of the two fluids leads to a rich variety of domain shapes, patterns, and orientations as the volume fraction of the more elastic component is varied.
Journal of Chemical Physics
118 No. 9


polymer, shear, structure, viscoelastic


Hobbie, E. , Jeon, H. , Wang, H. , Kim, H. , Stout, D. and Han, C. (2003), Shear-Induced Structure in Polymer Blends With Viscoelastic Asymmetry, Journal of Chemical Physics, [online], (Accessed March 1, 2024)
Created February 28, 2003, Updated October 12, 2021