High-Temperature-Aging Induced Sequential Recovery of Shape Memory Nitrile Butadiene Rubber Composites

2021 ◽  
Vol 13 (8) ◽  
pp. 10376-10387
Author(s):  
Jihua Zhang ◽  
Xiaoyan Liu ◽  
Weitao Zao ◽  
Huadong Feng ◽  
Yange Hou ◽  
...  
Keyword(s):  
High Temperature ◽  
Shape Memory ◽  
Butadiene Rubber ◽  
Rubber Composites ◽  
Nitrile Butadiene Rubber ◽  
High Temperature Aging ◽  
Temperature Aging

High shape‐memory effect of hindered phenol/nitrile–butadiene rubber composites by forming hydrogen bonding

2020 ◽  
Vol 137 (30) ◽  
pp. 48911
Author(s):  
Shi‐Kai Hu ◽  
Tao Shou ◽  
Si Chen ◽  
Xiu‐Ying Zhao ◽  
Yong‐Lai Lu ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Butadiene Rubber ◽  
Rubber Composites ◽  
Nitrile Butadiene Rubber ◽  
Hindered Phenol

scholarly journals Improved high-temperature damping performance of nitrile-butadiene rubber/phenolic resin composites by introducing different hindered amine molecules

e-Polymers ◽  
2020 ◽  
Vol 20 (1) ◽  
pp. 482-490
Author(s):  
Meng Song ◽  
Xiulin Yue ◽  
Xiujuan Wang ◽  
Mengjie Huang ◽  
Mingxing Ma ◽  
...  
Keyword(s):  
High Temperature ◽  
Phenolic Resin ◽  
Thermomechanical Analysis ◽  
Butadiene Rubber ◽  
Scanning Calorimetry ◽  
Nitrile Butadiene Rubber ◽  
Theoretical Support ◽  
Higher Temperature ◽  
Damping Materials ◽  
Hybrid Damping

AbstractBy introducing hindered amine GW-622 or GW-944 into nitrile-butadiene rubber/phenolic resin (NBR/PR, abbreviated as NBPR) matrix, we have prepared different hindered amine/NBR/PR ternary hybrid damping materials with high-temperature damping performance, respectively. Fourier transform infrared (FTIR) spectroscopy, scanning electron microscope (SEM), differential scanning calorimetry (DSC), and dynamic thermomechanical analysis (DMA) were used to research the microstructure, compatibility, and damping properties of the hindered amine/NBPR composites. FTIR results indicate that hydrogen bonds are formed between the hindered amine and the NBPR matrix. Both DSC and SEM results show that hindered amine has partial compatibility with the NBPR matrix. DMA results show that two loss peaks appear in the hindered amine/NBPR composite. Thereby, the composites show better damping performance at a higher temperature, and the temperature domain of high-temperature damping becomes wider with the increase in the addition of hindered amine. This study provides a theoretical support for the preparation of high-temperature damping materials.

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.

Evolution of the microstructure and phase composition of a subsurface of cast HP-type alloy during a long-term high-temperature aging

2019 ◽  
Vol 150 ◽  
pp. 166-173
Author(s):  
Sergey Yu. Kondrat'ev ◽  
Grigoriy P. Anastasiadi ◽  
Alina V. Ptashnik ◽  
Sergey N. Petrov
Keyword(s):  
Phase Composition ◽  
High Temperature ◽  
Type Alloy ◽  
High Temperature Aging ◽  
Temperature Aging

Effect of high temperature aging on luminescence properties of 5D0→7F2 transition of 8YSZ:Eu powder and coating

2014 ◽  
Vol 601 ◽  
pp. 57-62 ◽  
Author(s):  
Sumei Zhao ◽  
Yu Zhao ◽  
Binglin Zou ◽  
Xizhi Fan ◽  
Jiaying Xu ◽  
...  
Keyword(s):  
High Temperature ◽  
Luminescence Properties ◽  
High Temperature Aging ◽  
Temperature Aging

High‐performance hydrogenated nitrile butadiene rubber composites by in situ interfacial design of nanoclays

2019 ◽  
Vol 68 (9) ◽  
pp. 1618-1625
Author(s):  
Jihua Zhang ◽  
Hao Wang ◽  
Weitao Zao ◽  
Huadong Feng ◽  
Yunfeng Zhao
Keyword(s):  
High Performance ◽  
Butadiene Rubber ◽  
Rubber Composites ◽  
Nitrile Butadiene Rubber
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