Scaling Behavior of Anisotropy Relaxation in Deformed Polymers

Lam, Christopher N.; Xu, Wen -Sheng; Chen, Wei -Ren; Wang, Zhe; Stanley, Christopher B.; Carrillo, Jan-Michael Y.; Uhrig, David; Wang, Weiyu; Hong, Kunlun; Liu, Yun; Porcar, Lionel; Do, Changwoo; Smith, Gregory Scott; Sumpter, Bobby G.; Wang, Yangyang

doi:10.1103/PhysRevLett.121.117801

Scaling Behavior of Anisotropy Relaxation in Deformed Polymers

Journal Article · Tue Sep 11 00:00:00 EDT 2018 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.121.117801· OSTI ID:1479772

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Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Tsinghua Univ., Beijing (China)
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States); Univ. of Delaware, Newark, DE (United States)
Institut Laue-Langevin, Grenoble Cedex (France)

Drawing an analogy to the paradigm of quasielastic neutron scattering, we present a general approach for quantitatively investigating the spatiotemporal dependence of structural anisotropy relaxation in deformed polymers by using small-angle neutron scattering. Experiments and nonequilibrium molecular dynamics simulations on polymer melts over a wide range of molecular weights reveal that their conformational relaxation at relatively high momentum transfer Q and short time can be described by a simple scaling law, with the relaxation rate proportional to Q. Furthermore, this peculiar scaling behavior, which cannot be derived from the classical Rouse and tube models, is indicative of a surprisingly weak direct influence of entanglement on the microscopic mechanism of single-chain anisotropy relaxation.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)

Sponsoring Organization:: USDOE Office of Science (SC); National Science Foundation (NSF)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1479772

Alternate ID(s):: OSTI ID: 1469430

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 11 Vol. 121; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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