Elongational flow of blends of long and short polymers: Effective stretch relaxation time
D Auhl, P Chambon, TCB McLeish, DJ Read - Physical review letters, 2009 - APS
D Auhl, P Chambon, TCB McLeish, DJ Read
Physical review letters, 2009•APSWe study the onset of chain stretch and emergent extension hardening in the nonlinear
rheological response of molten binary blends of long and short polymers. We predict that,
upon dilution with short chains, the effective stretch relaxation time of the long chains initially
increases in proportion to ϕ L-α (where ϕ L is the volume fraction of long chains and α is the
dilution exponent for entanglements). We confirm this behavior experimentally, in a set of
experiments that measure both the dilution exponent from linear rheology and the effective …
rheological response of molten binary blends of long and short polymers. We predict that,
upon dilution with short chains, the effective stretch relaxation time of the long chains initially
increases in proportion to ϕ L-α (where ϕ L is the volume fraction of long chains and α is the
dilution exponent for entanglements). We confirm this behavior experimentally, in a set of
experiments that measure both the dilution exponent from linear rheology and the effective …
We study the onset of chain stretch and emergent extension hardening in the nonlinear rheological response of molten binary blends of long and short polymers. We predict that, upon dilution with short chains, the effective stretch relaxation time of the long chains initially increases in proportion to (where is the volume fraction of long chains and is the dilution exponent for entanglements). We confirm this behavior experimentally, in a set of experiments that measure both the dilution exponent from linear rheology and the effective stretch relaxation time under extensional flow.
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