Citation: Zhen-yue Yang, Wen-duo Chen, Li-jun Liu, Ji-zhong Chen. Migration of Ring Polymers in Poiseuille Flow and Comparison with Linear Polymers[J]. Acta Polymerica Sinica, ;2019, 50(11): 1229-1238. doi: 10.11777/j.issn1000-3304.2019.19074 shu

Migration of Ring Polymers in Poiseuille Flow and Comparison with Linear Polymers

1.
State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022
2.
University of Chinese Academy of Sciences, Beijing 100049
3.
School of Materials, Sun Yat-sen University, Guangzhou 510275

Corresponding author: Wen-duo Chen, wdchen@ciac.ac.cn Ji-zhong Chen, jzchen@ciac.ac.cn
Received Date: 12 April 2019
Revised Date: 29 May 2019

The dynamical and conformational properties of individual ring polymers with different chain lengths are investigated in Poiseuille flow through a tube using a hybrid mesoscale hydrodynamic simulation method, and migration behaviors are compared with those of linear chains. As the flow strength is increased, the ring chains migrate towards the centerline of the tube when the hydrodynamic interactions are included, but towards the tube wall when the hydrodynamic interactions are switched off. By analyzing the radial center-of-mass distribution function and the width of the distribution function of the ring chains, our studies reveal that the migration towards the centerline of the tube should be attributed to the hydrodynamic interactions rather than to the shear gradient in the Poiseuille flow. With the increase of flow intensity, the ring chains stretched more along the flow direction and shrunk smaller along the radial direction, independent of the location of their center-of-mass across the tube. When the hydrodynamic interactions are switched off, the extension along the flow direction and the shrinkage along the radial direction of the ring polymers are more pronounced than those with the hydrodynamic interactions. For a given flow strength, the longer the ring chain is, the eaiser it is to concentrate around the center of the tube due to the stronger hydrodynamic interactions between the chain and the tube wall, and the resulting distribution structure transits from the platform to the bimodal, and finally to the single-peaked with increasing chain length. By comparing the center-of-mass distributions and the structural properties between the ring and linear chains with the same chain length or the equilibrium radius of gyration, our simulation results show that the linear chains exhibit a more stretched conformation along the flow direction than the ring polymer chains, leading to the outward migration with a lower number density in the tube center.
- Poiseuille flow,
- Ring polymer,
- Hydrodynamic interactions,
- Polymer migration
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