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The viscoelastic si...
The viscoelastic signature underpinning polymer deformation under shear flow
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- Korolkovas, Airidas (författare)
- Uppsala universitet,Materialfysik,Inst Laue Langevin, Grenoble, France
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- Prévost, Sylvain (författare)
- Inst Laue Langevin, Grenoble, France
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- Kawecki, Maciej (författare)
- Uppsala universitet,Materialfysik
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- Devishvili, Anton (författare)
- Inst Laue Langevin, Grenoble, France; Lund University, Dept Phys Chem, Lund, Sweden
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- Adlmann, Franz (författare)
- Uppsala universitet,Materialfysik
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- Gutfreund, Philipp (författare)
- Inst Laue Langevin, Grenoble, France
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- Wolff, Max (författare)
- Uppsala universitet,Materialfysik
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(creator_code:org_t)
- 2019
- 2019
- Engelska.
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Ingår i: Soft Matter. - : Royal Society of Chemistry (RSC). - 1744-683X .- 1744-6848. ; 15:3, s. 371-380
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https://doi.org/10.1...
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https://uu.diva-port... (primary) (Raw object)
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https://pubs.rsc.org...
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Abstract
Ämnesord
Stäng
- Entangled polymers are deformed by a strong shear flow. The shape of the polymer, called the form factor, is measured by small angle neutron scattering. However, the real-space molecular structure is not directly available from the reciprocal-space data, due to the phase problem. Instead, the data has to be fitted with a theoretical model of the molecule. We approximate the unknown structure using piecewise straight segments, from which we derive an analytical form factor. We fit it to our data on a semi-dilute entangled polystyrene solution under in situ shear flow. The character of the deformation is shown to lie between that of a single ideal chain (viscous) and a cross-linked network (elastic rubber). Furthermore, we use the fitted structure to estimate the mechanical stress, and find a fairly good agreement with rheology literature.
Ämnesord
- NATURVETENSKAP -- Kemi -- Polymerkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Polymer Chemistry (hsv//eng)
- NATURVETENSKAP -- Kemi -- Fysikalisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Physical Chemistry (hsv//eng)
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- art (ämneskategori)
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