Role of Filler Shape and Connectivity on the Viscoelastic Behavior in Polymer Nanocomposites

2015 ◽  
Vol 48 (15) ◽  
pp. 5433-5438 ◽  
Author(s):  
Dan Zhao ◽  
Shufan Ge ◽  
Erkan Senses ◽  
Pinar Akcora ◽  
Jacques Jestin ◽  
...  
Keyword(s):  
Polymer Nanocomposites ◽  
Viscoelastic Behavior

Role of Casting Solvent on Nanoparticle Dispersion in Polymer Nanocomposites

2014 ◽  
Vol 47 (15) ◽  
pp. 5246-5255 ◽  
Author(s):  
Nicolas Jouault ◽  
Dan Zhao ◽  
Sanat K. Kumar
Keyword(s):  
Polymer Nanocomposites ◽  
Nanoparticle Dispersion

Prediction of Ball Motion in High-Speed Thrust-Loaded Ball Bearings

1976 ◽  
Vol 98 (3) ◽  
pp. 463-469 ◽  
Author(s):  
C. R. Gentle ◽  
R. J. Boness
Keyword(s):  
Computer Program ◽  
High Speed ◽  
Ball Bearing ◽  
Viscoelastic Behavior ◽  
Specific Situation ◽  
Fluid Models ◽  
Ball Bearings ◽  
Theoretical Predictions ◽  
Ball Motion

This paper describes the development of a computer program used to analyze completely the motion of a ball in a high-speed, thrust-loaded ball bearing. Particular emphasis is paid to the role of the lubricant in governing the forces and moments acting on each ball. Expressions for these forces due to the rolling and sliding of the ball are derived in the light of the latest fluid models, and estimates are also made of the cage forces applicable in this specific situation. It is found that only when lubricant viscoelastic behavior is considered do the theoretical predictions agree with existing experimental evidence.

The Role of Interface on the Toughening and Failure Mechanisms of Thermoplastic Nanocomposites Reinforced with Nanofibrillated Rubber

Nanoscale ◽  
2021 ◽  
Author(s):  
Mahdi Zeidi ◽  
Chun Il Kim ◽  
Chul B B. Park
Keyword(s):  
Polymer Nanocomposites ◽  
Functional Properties ◽  
Crucial Role ◽  
Failure Mechanisms

Interface plays a crucial role on the physical and functional properties of polymer nanocomposites, yet its effects have not been fully recognized in the setting of classical continuum-based modeling. In...

Carbon nanotube-polymer nanocomposites: The role of interfaces

2005 ◽  
Vol 11 (8-9) ◽  
pp. 567-586 ◽  
Author(s):  
C. Velasco-Santos ◽  
A. L. Martinez-Hernandez ◽  
V. M. Castano
Keyword(s):  
Carbon Nanotube ◽  
Polymer Nanocomposites

Gas diffusion in polymer nanocomposites: Role of defects and caves in fillers

2021 ◽  
Vol 28 (10) ◽  
Author(s):  
Jianfeng Wan ◽  
Wenyan Bi ◽  
Xiangbiao Liao ◽  
Hang Xiao ◽  
Xi Chen ◽  
...  
Keyword(s):  
Polymer Nanocomposites ◽  
Gas Diffusion

scholarly journals Intra-Cycle Elastic Nonlinearity of Nitrogen-Doped Carbon Nanotube/Polymer Nanocomposites under Medium Amplitude Oscillatory Shear (MAOS) Flow

Nanomaterials ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 1257 ◽  
Author(s):  
Milad Kamkar ◽  
Soheil Sadeghi ◽  
Mohammad Arjmand ◽  
Ehsan Aliabadian ◽  
Uttandaraman Sundararaj
Keyword(s):  
Rheological Properties ◽  
Polymer Nanocomposites ◽  
Polyvinylidene Fluoride ◽  
Viscoelastic Behavior ◽  
Oscillatory Shear ◽  
Dispersed Systems ◽  
Nitrogen Doped ◽  
Elastic Nonlinearity ◽  
Medium Amplitude Oscillatory Shear ◽  
Nitrogen Doped Carbon

This study seeks to unravel the effect of carbon nanotube’s physical and chemical features on the final electrical and rheological properties of polymer nanocomposites thereof. Nitrogen-doped carbon nanotubes (N-CNTs) were synthesized over two different types of catalysts, i.e., Fe and Ni, employing chemical vapor deposition. Utilizing this technique, we were able to synthesize N-CNTs with significantly different structures. As a result, remarkable differences in the network structure of the nanotubes were observed upon mixing the N-CNTs in a polyvinylidene fluoride (PVDF) matrix, which, in turn, led to drastically different electrical and rheological properties. For instance, no enhancement in the electrical conductivity of poorly-dispersed (N-CNT)Ni/PVDF samples was observed even at high nanotube concentrations, whereas (N-CNT)Fe/PVDF nanocomposites exhibited an insulative behavior at 1.0 wt%, a semi-conductive behavior at 2.0 wt%, and a conductive behavior at 2.7 wt%. In terms of rheology, the most substantial differences in the viscoelastic behavior of the systems were distinguishable in the medium amplitude oscillatory shear (MAOS) region. The stress decomposition method combined with the evaluation of the elastic and viscous third-order Chebyshev coefficients revealed a strong intra-cycle elastic nonlinearity in the MAOS region for the poorly-dispersed systems in small frequencies; however, the well-dispersed systems showed no intra-cycle nonlinearity in the MAOS region. It was shown that the MAOS elastic nonlinearity of poorly-dispersed systems stems from the confinement of N-CNT domains between the rheometer’s plates for small gap sizes comparable with the size of the agglomerates. Moreover, the intra-cycle elastic nonlinearity of poorly-dispersed systems is frequency-dependent and vanished at higher frequencies. The correlation between the microstructure and viscoelastic properties under large shear deformations provides further guidance for the fabrication of high-performance 3D-printed electrically conductive nanocomposites with precisely controllable final properties for engineering applications.

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