Low-frequency mechanical spectroscopy study of conformational transition of polymer chains in concentrated solutions

2008 ◽  
Vol 79 (12) ◽  
pp. 126105 ◽  
Author(s):  
Xuebang Wu ◽  
Qiaoling Xu ◽  
Jiapeng Shui ◽  
Zhengang Zhu
Keyword(s):  
Conformational Transition ◽  
Low Frequency ◽  
Polymer Chains ◽  
Spectroscopy Study ◽  
Mechanical Spectroscopy ◽  
Concentrated Solutions

scholarly journals Washing Durability of Cotton Coated with a Fluorinated Resin: An AFM, XPS, and Low Frequency Mechanical Spectroscopy Study

2002 ◽  
Vol 72 (9) ◽  
pp. 832-843 ◽  
Author(s):  
D. Juhué ◽  
A.C. Gayon ◽  
J.M. Corpart ◽  
C. Quet ◽  
P. Delichère ◽  
...  
Keyword(s):  
Low Frequency ◽  
Spectroscopy Study ◽  
Mechanical Spectroscopy ◽  
Washing Durability

Toward High-Resolution Mechanical Spectroscopy HRMS - Logarithmic Decrement

2012 ◽  
Vol 184 ◽  
pp. 467-472 ◽  
Author(s):  
Leszek B. Magalas ◽  
M. Majewski
Keyword(s):  
High Resolution ◽  
Low Frequency ◽  
Logarithmic Decrement ◽  
Frequency Resolution ◽  
Mechanical Spectroscopy ◽  
Spectral Leakage ◽  
Experimental Noise ◽  
Relative Errors ◽  
The Way

In this work, we present the comparison between different methods used to compute the logarithmic decrement,δ. The parametric OMI method and interpolated DFT (IpDFT) methods are used to compute theδfrom free decaying oscillations embedded in an experimental noise typical for low-frequency mechanical spectrometers. The results are reported forδ= 5×10-4, = 1.12345 Hz and different sampling frequencies, = 1 kHz and 4 kHz. A new YM algorithm yields the smallest dispersion in experimental points of the logarithmic decrement and the smallest relative errors among all investigated IpDFT methods. In general, however, the IpDFT methods suffer from spectral leakage and frequency resolution. Therefore it is demonstrated that the performance of different methods to compute theδcan be listed in the following order: (1) OMI, (2) YM, (3) YMC, and (4) the Yoshida method, Y. For short free decays the order of the best performers is different: (1) OMI and (2) YMC. It is important to emphasize that IpDFT methods (including the Yoshida method, Y) are discouraged for signals that are too short. In conclusion, the best methods to compute the logarithmic decrement are the OMI and the YM. These methods will pave the way toward high-resolution mechanical spectroscopy HRMS.

A mechanical spectroscopy study of the Zr69.5Cu12Ni11Al7.5 alloy

2000 ◽  
Vol 310 (1-2) ◽  
pp. 229-232 ◽  
Author(s):  
Roberto Scarfone ◽  
Hans-Rainer Sinning
Keyword(s):  
Spectroscopy Study ◽  
Mechanical Spectroscopy

The Role of Polymer-particle Interactions on the Viscoelastic Properties of Polymer Nanocomposites

2007 ◽  
Vol 1056 ◽  
Author(s):  
Alireza Sarvestani ◽  
Esmaiel Jabbari
Keyword(s):  
Polymer Nanocomposites ◽  
Volume Fraction ◽  
Molecular Model ◽  
Low Frequency ◽  
Maxwell Model ◽  
Equilibrium Structure ◽  
Polymer Chains ◽  
Spherical Particles ◽  
Filler Concentration ◽  
Adsorbed Polymer

ABSTRACTA molecular model is proposed for the dynamics of polymer chains in dilute polymer solutions containing well-dispersed spherical particles. In the presence of short range energetic affinity between the monomers and filler surface, the equilibrium structure of the adsorbed polymer layer is determined by a scaling theory. The viscoelastic response of the suspension is studied by a Maxwell model. It is shown that the solid-like properties of polymer nanocomposites in low frequency regimes could be attributed to the slowdown of the relaxation process of polymer chains. This process is controlled by the monomer-particle frictional interactions, density of the adsorbed polymer chains on the particles surface (controlled by monomer-particle adsorption energy), and volume fraction of the interfacial layer which can be enhanced by reduction of filler size or increasing the filler concentration.

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