Inconsistencies in Determining the Entanglement Time of Poly(butadiene) from Rheology and Comparison to Results from Field-Cycling NMR

被引：4

作者：

Hofmann, M. ^{[1
]}

Fatkullin, N. ^{[2
]}

Roessler, E. A. ^{[3
]}

机构：

[1] Louisiana State Univ, Dept Chem, Baton Rouge, LA 70803 USA

[2] Kazan Fed Univ, Inst Phys, Kazan 420008, Russia

[3] Univ Bayreuth, Experimentalphys 2, D-95440 Bayreuth, Germany

来源：

MACROMOLECULES | 2017年 / 50卷 / 04期

关键词：

NEUTRON SPIN-ECHO; TEMPERATURE SUPERPOSITION; CHAIN DYNAMICS; RELAXATION; POLYMERS; MELTS; RELAXOMETRY; DEPENDENCE; DIFFUSION; BEHAVIOR;

D O I：

10.1021/acs.macromol.6b02546

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The determination of the entanglement time is of great importance for testing extensions of the tube reputation (TR) model. In this study, the entanglement time was compared analyzing shear-stress relaxation to that of FC NMR. The NMR measurements included not only high temperatures where polymer-specific dynamics are probed but also low temperatures for which the segmental or structural relaxation dominates the relaxation rate. Usually, significant decoupling of structural is observed at so low temperatures. The master curve construction yields the structural relaxation time instead of frequency shift factors as encountered in many rheological studies. The structural time constant can be compared to the corresponding results from rheological measurements. In order to do so, temperatures almost as low are required. Comparing the results from different experiments not done at similar temperatures implies the construction of master curves based on the assumption that FTS holds. Thus, any error in the shift factors will influence the result.

引用

页码：1755 / 1758

页数：4

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