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Nonlinear Rheological Behaviors in Polymer Melts after Step Shear

Ruan, Yongjin and Lu, Yuyuan and An, Lijia and Wang, Zhen-Gang (2019) Nonlinear Rheological Behaviors in Polymer Melts after Step Shear. Macromolecules, 52 (11). pp. 4103-4110. ISSN 0024-9297. doi:10.1021/acs.macromol.9b00392. https://resolver.caltech.edu/CaltechAUTHORS:20190523-094613725

[img] PDF (Results of relaxation moduli, the influences of shear rates, thermal noise, chain stiffness, boundary conditions, finite size effects, and macroscopic motions of variant samples) - Supplemental Material
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Abstract

Using molecular dynamics simulation, we investigate the evolution of chain conformation, stress relaxation, and fracture for a polymer melt between two walls after step shear. We find that the characteristic overlap time for the reduced relaxation moduli and the time that the stretched primitive chain retracts to its equilibrium length are both much longer than the Rouse time. Importantly, we observe significant fracture-like flow after shear cessation. While there is considerable randomness in the location of the fracture plane and the magnitude of displacement from sample to sample, our analysis suggests that the randomness is not due to thermal noise, but may reflect inherent structural and dynamic heterogeneity in the entangled polymer network.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1021/acs.macromol.9b00392DOIArticle
ORCID:
AuthorORCID
Ruan, Yongjin0000-0002-8323-4018
Lu, Yuyuan0000-0002-4073-678X
Wang, Zhen-Gang0000-0002-3361-6114
Additional Information:© 2019 American Chemical Society. Received: February 25, 2019; Revised: April 30, 2019; Published: May 22, 2019. This work was supported by the National Natural Science Foundation of China (grant nos. 21790340, 21334007, and 21674113), the Key Research Program of Frontier Sciences, CAS (grant no. QYZDY-SSW-SLH027), and Jilin Scientific and Technological Development Program (grant no. 20180519001JH). Y.L. acknowledges the Youth Innovation Promotion Association of CAS (grant no. 2016204) for financial support. The authors declare no competing financial interest.
Funders:
Funding AgencyGrant Number
National Natural Science Foundation of China21790340
National Natural Science Foundation of China21334007
National Natural Science Foundation of China21674113
Chinese Academy of SciencesQYZDY-SSW-SLH027
Jilin Scientific and Technological Development Program20180519001JH
Chinese Academy of Sciences2016204
Issue or Number:11
DOI:10.1021/acs.macromol.9b00392
Record Number:CaltechAUTHORS:20190523-094613725
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190523-094613725
Official Citation:Nonlinear Rheological Behaviors in Polymer Melts after Step Shear. Yongjin Ruan, Yuyuan Lu, Lijia An, and Zhen-Gang Wang. Macromolecules 2019 52 (11), 4103-4110 DOI: 10.1021/acs.macromol.9b00392
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:95731
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:23 May 2019 17:06
Last Modified:16 Nov 2021 17:15

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