scholarly journals Influence of Carbon Black and Silica Fillers with Different Concentrations on Dielectric Relaxation in Nitrile Butadiene Rubber Investigated by Impedance Spectroscopy

Polymers ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 155
Author(s):  
Gyung-Hyun Kim ◽  
Young-Il Moon ◽  
Jae-Kap Jung ◽  
Myung-Chan Choi ◽  
Jong-Woo Bae
Keyword(s):  
Activation Energy ◽  
Impedance Spectroscopy ◽  
Carbon Black ◽  
Dc Conductivity ◽  
Butadiene Rubber ◽  
Central Frequency ◽  
Dielectric Relaxations ◽  
Nitrile Butadiene Rubber ◽  
Energy Behavior ◽  
Silica Fillers

In neat nitrile butadiene rubber (NBR), three relaxation processes were identified by impedance spectroscopy: α and α′ processes and the conduction contribution. We investigated the effects of different carbon black (CB) and silica fillers with varying filler content on the dielectric relaxations in NBR by employing a modified dispersion analysis program that deconvolutes the corresponding processes. The central frequency for the α′ process with increasing high abrasion furnace (HAF) CB filler was gradually upshifted at room temperature, while the addition of silica led to a gradual downshift of the center frequency. The activation energy behavior for the α′ process was different from that for the central frequency. The use of HAF CB led to a rapid increase in DC conductivity, resulting from percolation. The activation energy for the DC conductivity of NBRs with HAF CB decreased with increasing filler, which is consistent with that reported in different groups.

scholarly journals Dielectric Relaxation Spectroscopy in Synthetic Rubber Polymers: Nitrile Butadiene Rubber and Ethylene Propylene Diene Monomer

2020 ◽  
Vol 2020 ◽  
pp. 1-15
Author(s):  
Young Il Moon ◽  
Jae Kap Jung ◽  
Ki Soo Chung
Keyword(s):  
High Temperature ◽  
Dielectric Relaxation ◽  
Temperature Region ◽  
Butadiene Rubber ◽  
Ethylene Propylene Diene Monomer ◽  
Dielectric Relaxation Spectroscopy ◽  
Ethylene Propylene ◽  
Dielectric Relaxations ◽  
Nitrile Butadiene Rubber ◽  
Synthetic Rubber

The dielectric permittivity of synthetic rubber polymers, nitrile butadiene rubber (NBR) and ethylene propylene diene monomer (EPDM), with both frequency and temperature variations, was thoroughly investigated by dielectric relaxation spectroscopy (DRS). The spectrum versus frequency of DRS was analyzed with the semiempirical Havriliak–Negami formula and conductivity contribution by employing the newly developed “dispersion analyzer” analysis program. The main dielectric relaxations called the α- and β-processes, associated with the cooperative motion of chains in polymers, were discovered in the low-temperature region. In the high-temperature region, we found Maxwell–Wagner–Sillars (MWS) relaxation associated with polymer interfacing and normal-mode (α’) relaxation responsible for end-to-end dipole vector motion. The activation energies of schematic molecular chains responsible for the relaxation processes were obtained with the information about its motional mode. The glass transition temperature and dipole moment for the side group were also determined and compared with those from previous studies. In the EPDM specimen, the peaks of α- and β-relaxation merged at high temperature and were separated with decreasing temperature. The first observations of both merging and splitting were consistent with the results on the temperature dependency of the relaxation strength. Both contour mapping and three-dimensional plots for the two rubbers provide visual information for the distribution and mapping of relaxation.

Energy dissipation accompanying Mullins effect of nitrile butadiene rubber/carbon black nanocomposites

Polymer ◽  
2019 ◽  
Vol 171 ◽  
pp. 106-114 ◽  
Author(s):  
Zhiyun Li ◽  
Huilong Xu ◽  
Xinxin Xia ◽  
Yihu Song ◽  
Qiang Zheng
Keyword(s):  
Energy Dissipation ◽  
Carbon Black ◽  
Mullins Effect ◽  
Butadiene Rubber ◽  
Nitrile Butadiene Rubber

Synergistic effects of hybridization of carbon black and carbon nanotubes on the mechanical properties and thermal conductivity of a rubber blend system

2017 ◽  
Vol 37 (8) ◽  
pp. 785-794 ◽  
Author(s):  
Biao Yin ◽  
Yanwei Wen ◽  
Hongbing Jia ◽  
Jingyi Wang ◽  
Zhaodong Xu ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotubes ◽  
Carbon Black ◽  
Synergistic Effects ◽  
Tensile Modulus ◽  
Rubber Matrix ◽  
Butadiene Rubber ◽  
Structure Property ◽  
Tear Strength ◽  
Nitrile Butadiene Rubber

Abstract The effects of hybridization of multi-walled carbon nanotubes (MWCNTs) with carbon black (CB) and the structure-property relationships of nanocomposites based on hydrogenated nitrile-butadiene rubber/hydrogenated carboxylated nitrile-butadiene rubber blends were extensively studied. MWCNTs used in this work were modified through acid treatment to improve the dispersion of MWCNTs in the rubber matrix and the surface interaction between MWCNTs and matrix. Synergistic interaction between CB and MWCNTs increased the tensile modulus and tear strength of nanocomposites. The effect of MWCNTs on the transport properties invoked an increment in the thermal conductivity of the nanocomposites. A combination of 10 phr (parts per hundred rubber) MWCNTs with 40 phr CB dramatically increased the modulus at 100% elongation, tear strength, and thermal conductivity of the nanocomposite by 66%, 28%, and 36%, respectively, compared with those of nanocomposite filled with 40 phr CB.

scholarly journals Li-Rich Antiperovskite/Nitrile Butadiene Rubber Composite Electrolyte for Sheet-Type Solid-State Lithium Metal Battery

2021 ◽  
Vol 9 ◽  
Author(s):  
Juncao Bian ◽  
Huimin Yuan ◽  
Muqing Li ◽  
Sifan Ling ◽  
Bei Deng ◽  
...  
Keyword(s):  
Activation Energy ◽  
Solid State ◽  
Low Cost ◽  
Great Promise ◽  
Butadiene Rubber ◽  
Polymer Scaffold ◽  
Composite Electrolyte ◽  
Practical Applications ◽  
Nitrile Butadiene Rubber ◽  
Robust Techniques

Lithium-rich antiperovskites (LiRAPs) hold great promise to be the choice of solid-state electrolytes (SSEs) owing to their high ionic conductivity, low activation energy, and low cost. However, processing sheet-type solid-state Li metal batteries (SSLiB) with LiRAPs remains challenging due to the lack of robust techniques for battery processing. Herein, we propose a scalable slurry-based procedure to prepare a flexible composite electrolyte (CPE), in which LiRAP (e.g., Li2OHCl0.5Br0.5, LOCB) and nitrile butadiene rubber (NBR) serve as an active filler and as a polymer scaffold, respectively. The low-polar solvent helps to stabilize the LiRAP phase during slurry processing. It is found that the addition of LOCB into the NBR polymer enhances the Li ion conductivity for 2.3 times at 60°C and reduces the activation energy (max. 0.07 eV). The as-prepared LOCB/NBR CPE film exhibits an improved critical current of 0.4 mA cm−2 and can stably cycle for over 1000 h at 0.04 mA cm−2 under 60°C. In the SSLiB with the sheet-type configuration of LiFePO4(LFP)||LOCB/NBR CPE||Li, LFP exhibits a capacity of 137 mAh/g under 60 at 0.1°C. This work delivers an effective strategy for fabrication of LiRAP-based CPE film, advancing the LiRAP-family SSEs toward practical applications.

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