Direct Assessment of Tube Dilation in Entangled Polymers

被引：19

作者：

Gold, B. J. ^{[1
,2
,7
,8
]}

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

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

Radulescu, A. ^{[3
]}

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

Allgaier, J. ^{[1
,2
]}

Hoffmann, I. ^{[4
]}

Parisi, D. ^{[5
,6
]}

Vlassopoulos, D. ^{[5
,6
]}

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

机构：

[1] Forschungszentrum Julich, JCNS, D-52428 Julich, Germany

[2] Forschungszentrum Julich, ICS, D-52428 Julich, Germany

[3] Forschungszentrum Julich, JCNS, Maier Leibnitz Zentrum, D-85747 Garching, Germany

[4] ILL Grenoble, F-3800 Grenoble, France

[5] FORTH, Inst Elect Struct & Laser, Iraklion 70013, Crete, Greece

[6] Univ Crete, Dept Mat Sci & Technol, Iraklion 70013, Crete, Greece

[7] Swiss Fed Inst Technol, Dept Mat, Soft Mat Lab, Vladimir Prelog Weg 5, CH-8093 Zurich, Switzerland

[8] Paul Scherrer Inst, CH-5232 Villigen, Switzerland

来源：

PHYSICAL REVIEW LETTERS | 2019年 / 122卷 / 08期

关键词：

DYNAMIC DILUTION; BINARY BLENDS; STRESS-RELAXATION; PLATEAU MODULUS; REPTATION; MELTS; MODEL; VISCOSITY; RHEOLOGY; DENSITY;

D O I：

10.1103/PhysRevLett.122.088001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A key ingredient within theories focusing on the rheology of entangled polymers is the way how the topological constraints of an entangled chain are lifted by unconstrained segments, i.e., how the constraining tube is dilated. This important question has been addressed by directly measuring the tube diameter d at the scale of the tube by neutron spin echo spectroscopy. The tube diameter d and plateau modulus G(N)(0) of highly entangled polyethylene oxide (PEO) chains of volume fraction c that are diluted by low molecular PEO show a concentration dependence d proportional to c(a/2) and G(N)(0) proportional to c(1+a) with an exponent a close to 4/3. This result allows the clear discrimination between different theoretical models that predict 4/3 or other values between 1 and 2 and provides an important ingredient to tube model theories.

引用

页数：5

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