Stress and neutron scattering measurements on linear polymer melts undergoing steady elongational flow

We use small-angle neutron scattering to measure the molecular stretching in polystyrene melts undergoing steady elongational flow at large stretch rates. The radius of gyration of the central segment of a partly deuterated polystyrene molecule is, in the stretching direction, increasing with the st...

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Bibliographic Details
Published in:Rheologica acta 2012-05, Vol.51 (5), p.385-394
Main Authors: Hassager, Ole, Mortensen, Kell, Bach, Anders, Almdal, Kristoffer, Rasmussen, Henrik Koblitz, Pyckhout-Hintzen, Wim
Format: Article
Language:English
Subjects:
Applied sciences
Characterization and Evaluation of Materials
Chemistry and Materials Science
Complex Fluids and Microfluidics
Deuteration
Elongation
Exact sciences and technology
Food Science
Materials Science
Mechanical Engineering
Melts
Neutron scattering
Neutrons
Organic polymers
Original Contribution
Physicochemistry of polymers
Polymer melts
Polymer Sciences
Polystyrene resins
Properties and characterization
Rheology and viscoelasticity
Soft and Granular Matter
Stretching
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Summary:We use small-angle neutron scattering to measure the molecular stretching in polystyrene melts undergoing steady elongational flow at large stretch rates. The radius of gyration of the central segment of a partly deuterated polystyrene molecule is, in the stretching direction, increasing with the steady stretch rate to a power of about 0.25. This value is about half of the exponent observed for the increase in stress value σ , in agreement with Gaussian behavior. Thus, finite chain extensibility does not seem to play an important role in the strongly non-linear extensional stress behavior exhibited by the linear polystyrene melt.
ISSN:0035-4511
1435-1528
DOI:10.1007/s00397-012-0622-1