期刊
PHYSICAL REVIEW LETTERS
卷 127, 期 17, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.127.177801
关键词
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资金
- Independent Research Fund Denmark, Technology and Production [4005-00112]
- Velux Foundation
- Aage and Johanne Louis-Hansen Foundation
- Danish Research Infrastructure via DANSCATT
This study presents a detailed description of the structural relaxation of a polystyrene star polymer after cessation of high-rate extensional flow, which includes three distinct regimes of relaxation and ends with relaxation via reptation.
We present structural relaxation studies of a polystyrene star polymer after cessation of high-rate extensional flow. During the steady-state flow, the scattering pattern shows two sets of independent correlations peaks, reflecting the structure of a polymer confined in a fully oriented three-armed tube. Upon cessation of flow, the relaxation constitutes three distinct regimes. In a first regime, the perpendicular correlation peaks disappear, signifying disruption of the virtual tube. In a second regime, broad scattering arcs emerge, reflecting relaxation from highly aligned chains to more relaxed, still anisotropic form. New entanglements dominate the last relaxation regime where the scattering pattern evolves to a successively elliptical and circular pattern, reflecting relaxation via reptation.
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