The viscoelastic signature underpinning polymer deformation under shear flow
(2019) In Soft Matter 15(3). p.371-380- Abstract
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... (More)
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.
(Less)
- author
- Korolkovas, Airidas ; Prévost, Sylvain ; Kawecki, Maciej ; Devishvili, Anton ; Adlmann, Franz A. ; Gutfreund, Philipp and Wolff, Max
- organization
- publishing date
- 2019
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Soft Matter
- volume
- 15
- issue
- 3
- pages
- 10 pages
- publisher
- Royal Society of Chemistry
- external identifiers
-
- scopus:85060014311
- pmid:30519692
- ISSN
- 1744-683X
- DOI
- 10.1039/c8sm02255k
- language
- English
- LU publication?
- no
- id
- 9eaa5ff5-2bfc-4361-92df-9f8bf382e715
- date added to LUP
- 2019-01-29 09:35:14
- date last changed
- 2024-06-11 03:24:53
@article{9eaa5ff5-2bfc-4361-92df-9f8bf382e715,
abstract = {{<p>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.</p>}},
author = {{Korolkovas, Airidas and Prévost, Sylvain and Kawecki, Maciej and Devishvili, Anton and Adlmann, Franz A. and Gutfreund, Philipp and Wolff, Max}},
issn = {{1744-683X}},
language = {{eng}},
number = {{3}},
pages = {{371--380}},
publisher = {{Royal Society of Chemistry}},
series = {{Soft Matter}},
title = {{The viscoelastic signature underpinning polymer deformation under shear flow}},
url = {{http://dx.doi.org/10.1039/c8sm02255k}},
doi = {{10.1039/c8sm02255k}},
volume = {{15}},
year = {{2019}},
}