Molecular Scale Dynamics of Large Ring Polymers

被引：76

作者：

Goossen, S. ^{[1
,2
]}

Bras, A. R. ^{[1
,2
]}

Krutyeva, M. ^{[1
,2
]}

Sharp, M. ^{[3
]}

Falus, P. ^{[3
]}

Feoktystov, A. ^{[4
]}

Gasser, U. ^{[5
]}

Pyckhout-Hintzen, W. ^{[1
,2
]}

Wischnewski, A. ^{[1
,2
]}

Richter, D. ^{[1
,2
]}

机构：

[1] Forschungszentrum Julich, Julich Ctr Neutron Sci JCNS 1, D-52425 Julich, Germany

[2] Forschungszentrum Julich, Inst Complex Syst ICS 1, D-52425 Julich, Germany

[3] Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France

[4] Forschungszentrum Julich, Outstn MLZ, Julich Ctr Neutron Sci, D-85747 Garching, Germany

[5] Paul Scherrer Inst, Lab Neutron Scattering & Imaging, CH-5232 Villigen, Switzerland

来源：

PHYSICAL REVIEW LETTERS | 2014年 / 113卷 / 16期

关键词：

VISCOELASTIC PROPERTIES; POLY(ETHYLENE OXIDE); FIXED OBSTACLES; CHAIN; CONFORMATION; ARCHITECTURE; VISCOSITY;

D O I：

10.1103/PhysRevLett.113.168302

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present neutron scattering data on the structure and dynamics of melts from polyethylene oxide rings with molecular weights up to ten times the entanglement mass of the linear counterpart. The data reveal a very compact conformation displaying a structure approaching a mass fractal, as hypothesized by recent simulation work. The dynamics is characterized by a fast Rouse relaxation of subunits (loops) and a slower dynamics displaying a lattice animal-like loop displacement. The loop size is an intrinsic property of the ring architecture and is independent of molecular weight. This is the first experimental observation of the space-time evolution of segmental motion in ring polymers illustrating the dynamic consequences of their topology that is unique among all polymeric systems of any other known architecture.

引用

页数：5

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