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Scaling Behavior of Anisotropy Relaxation in Deformed Polymers



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


Drawing an analogy to the paradigm of quasi-elastic 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. 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.
Physical Review Letters


polymer melts, conformation relaxation, small angle neutron scattering, entanglement


Lam, C. , Xu, W. , Chen, W. , Wang, Z. , Stanley, C. , Carrillo, J. , Uhrig, D. , Wang, W. , Hong, K. , Liu, Y. , Porcar, L. , Do, C. , Smith, G. , Sumpter, B. and Wang, Y. (2018), Scaling Behavior of Anisotropy Relaxation in Deformed Polymers, Physical Review Letters, [online], (Accessed April 13, 2024)
Created September 10, 2018, Updated October 12, 2021