Polymers
·
2021
·Vol. 13
·期 23
·4096
·
IF 4.329
Lin Wang,Yanqiang Ni,Xin Qi,Liqun Zhang,Dongmei Yue
Hydrogenated Nitrile Rubber (HNBR) is widely used in aerospace, petroleum exploration and other fields because of its excellent performances. However, there remains a challenge of balancing the oil resistance and the low temperature resistance for HNBR. In this work, a series of grafted carboxyl nitrile rubber (XNBR) was prepared by the esterification reaction between active functional groups (–COOH) of XNBR and alkanols of different molecular chain lengths (C8H17OH, C12H25OH, C16H33OH, C18H37OH) or Methoxypolyethylene glycols (MPEG) of different molecular weights (Mn = 350, 750, 1000). The structure and low temperature resistance of as-obtained grafted polymers were characterized by Fourier Transform Infrared (FTIR),1H-NMR and Differential scanning calorimetry (DSC). It was found that the glass transition temperatures (Tg) of grafted XNBR were significantly decreased. MPEG grafted polymers with better low temperature resistance were then selected for hydrogenation. As-prepared hydrogenated XNBR grafted with MPEG-1000 (HXNBR-g-1000) showed the lowest Tgof −29.8 °C and the best low temperature resistance. This work provides a novel and simple preparation method for low temperature resistant HNBR, which might be used potentially in extremely cold environments.Keywords:hydrogenated nitrile rubber (HNBR);grafting;low temperature resistance
研究领域:
材料科学
·
高分子化学
·
航空航天工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2019
·
IF 6.309
Shuyan Yang,Junyu Tian,Xiaofei Bian,Yunhui Wu
Fly ash (FA) is a solid waste from coal-fired power stations, which can cause serious environmental problems without further treatment. Although FA has been successfully utilized in building materials , the reuse of FA in the polymer industry has remained a great challenge due to the difficulty in organically-modifying the smooth surfaces of FA particles. In this study, by introducing tannic acid (TA, a naturally occurring plant polyphenol), nitrile butadiene rubber (NBR)/FA/TA composites were prepared via a simple environment-friendly method. The properties of the products were thoroughly investigated and experiments showed that the TA incorporation into NBR/FA composites resulted in formation of hydrogen bonds among NBR, FA, and TA, leading to dramatic improvement in surface adhesion between NBR and FA. As a consequence, the tensile strength of the NBR/20FA/0.4 TA composite was ~110.4% larger than that of NBR/20FA composite, thus opening a new route to large-scale practical use of FA in the polymer industry.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Polymers
·
2020
·Vol. 12
·期 11
·2763
·
IF 3.426
Munir Hussain,Sohail Yasin,Hafeezullah Memon,Zhiyun Li,Xinpeng Fan,Muhammad Adnan Akram,Wanjie Wang,Yihu Song,Qiang Zheng
In this paper we designed greener rubber nanocomposites exhibiting high crosslinking density, and excellent mechanical and thermal properties, with a potential application in technical fields including high-strength and heat-resistance products. Herein 1-ethyl-3-methylimidazolium acetate ([EMIM]OAc) ionic liquid was combined with silane coupling agent to formulate the nanocomposites. The impact of [EMIM]OAc on silica dispersion in a nitrile rubber (NBR) matrix was investigated by a transmission electron microscope and scanning electron microscopy. The combined use of the ionic liquid and silane in an NBR/silica system facilitates the homogeneous dispersion of the silica volume fraction (φ) from 0.041 to 0.177 and enhances crosslinking density of the matrix up to three-fold in comparison with neat NBR, and also it is beneficial for solving the risks of alcohol emission and ignition during the rubber manufacturing. The introduction of ionic liquid greatly improves the mechanical strength (9.7 MPa) with respect to neat NBR vulcanizate, especially at high temperatures e.g., 100 °C. Furthermore, it impacts on rheological behaviors of the nanocomposites and tends to reduce energy dissipation for the vulcanizates under large amplitude dynamic shear deformation.Keywords:nitrile butadiene rubber;rheology;ionic liquids;tensile properties
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Lin Wang,Manman Jia,Hui Jiao,Shukang Ti,Dongmei Yue
Nitrile Butadiene Rubber (NBR) is widely used in aerospace, petroleum exploration, auto parts, and other fields because of its excellent performance. Nevertheless, NBR usually needs to be crosslinked with sulfur or peroxide, which restricts the tensile performance and recyclability of NBR. Herein, a novel strategy was developed to address these issues by introducing dynamic urea bonds into the main chain using a simple, catalyst-free one-pot method. The presence of urea bonds not only provides a large number of hydrogen bonding sites between the molecular chains but also exhibits the remarkable microphase separation properties of thermoplastic elastomers. This approach endows NBR with enhanced dynamic characteristics and significant recyclability. As a result, the as-synthesized multifunctional NBR elastomer (I–A0.5–P0.5) exhibits excellent tensile strength (19.9 MPa), toughness (93.7 MJ m−3), low glass transition temperature (−52 °C), and low compression cold resistance coefficient (0.15 at −55 °C), which are comparable to those of conventionally covalently crosslinked NBR. Importantly, the elastomer can retain its mechanical robustness, chemical structure, and thermal stability after multiple rounds of recycling (after five times of recycling, with a recovery of more than 81%). To broaden the application of NBR products, I–A0.5–P0.5 was crosslinked with sulfur, and its performance was compared with NBR vulcanizates of different acrylonitrile contents. It shows excellent oil resistance and low temperature resistance. Surprisingly, it can also possess the ability to be reprocessed multiple times. This new multifunctional thermoplastic NBR elastomer is of great significance in solving the problem of difficult recycling of traditional NBR and is expected to replace traditional covalently cross-linked NBR.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2025
·Vol. 36
·期 3
·e70140
·
IF 3.4
Xianning Wang,Runqi Zhang,Lujia Xuan,Mengmeng Yu,Jianqing Mao,Gang Cheng,Jieqiong Yan,Hongzhen Wang
Covalent adaptable networks offer a viable approach for producing recyclable rubber materials. Nevertheless, the intricate synthesis process and insufficient mechanical strength limit their commercialization applications. In this study, the reinforced, thermal-healing, and recyclable chitosan/ethylene propylene diene rubber (CEF-CS) was synthesized using a solid-phase blending process via the Diels-Alder (D-A) reaction. Furfural modified chitosan (F-CS) was included as a reinforcing filler and dynamic cross-linking point into the network formed via the D-A reaction. The influence of F-CS content on the mechanical, thermomechanical, and thermal repair characteristics of CEF-CS composites was examined. The results showed that the CEF-CS composites exhibited certain mechanical strength and dependable repair capabilities. As the F-CS content increased, the tensile strength of CEF-CS composites initially rose and subsequently declined, reaching a peak of 5.1 MPa, which was 5.1 times more than the control without F-CS. The first healing efficiency of tensile strength exceeded 70%, whereas the second healing efficiency was above 60%. Moreover, the simple preparation procedure and enhanced mechanical strength facilitate the commercial utilization of recyclable rubber materials, which is crucial for addressing the environmental pollution issue associated with rubber materials.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2018
·Vol. 11
·期 6
·921
·
IF 2.467
Rui Zhong,Zhao Zhang,Hongguo Zhao,Xianru He,Xin Wang,Rui Zhang
Graphene oxide (GO), modified with anti-aging agentp-phenylenediamine (PPD), was added into nitrile rubber (NBR) in order to improve the thermo-oxidative stability of NBR. The modification of GO and the transformation of functional groups were characterized by Fourier transform infrared spectroscopy (FTIR), Raman, and X-ray diffraction (XRD). Mechanical performances of NBR composites before and after the thermo-oxidative aging were recorded. The results of dynamic mechanical analysis (DMA) show an increased storage modulus (G’) and a decreased value of area of tan δ peak after introducing modified GO into NBR. It indicates that filler particles show positive interaction with molecular chains. The thermo-oxidative stability of composites was investigated by thermogravimetric analysis (TG) and differential scanning calorimetry (DSC). Then, the thermo-oxidative aging kinetic parameters were obtained by the Flynn–Wall–Ozawa (FWO) equation. The results of aging tests show that the thermo-oxidative stability of rubber matrix increases obviously after introducing GO–PPD. In addition, mechanical properties (tensile strength and elongation at break) of both before and after aged NBR/GO–PPD composites were superior to that of NBR. This work provides meaningful guidance for achieving multifunction thermo-oxidative aging resistance rubber composites.Keywords:graphene oxide (GO);p-phenylenediamine (PPD);nitrile rubber (NBR);thermo-oxidative stability
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
PubMed
高影响因子
POLYMER BULLETIN
·
2023
·
IF 3.2
Li Qiuying,Li Xifei,Liu Dekun,Xu Ruiyang,Wei Shaohua
Requirements for the material with high tensile strength and elongation at break are proposed with the development of soft and stretchable electronics. The nitrile butadiene rubber (NBR) crosslinked by coordination bonds has excellent tensile properties and is expected to be used in the flexible electronics field, but the effect of strain rate on tensile properties of crosslinked NBR needs to be further analyzed. In this work, the NBR with dual crosslinked networks was prepared by methods of double ligands crosslinking, covalence-coordination crosslinking, and bimetallic coordination crosslinking. Furthermore, the strain rate sensitivity of tensile properties of NBR with dual crosslinked networks was studied by considering the strain rate as a variable. The results indicated that the strength of the coordination bonds formed by the second ligand had significant effects on the tensile properties of NBR: The coordination bonds with low strength could protect the integrity of the crosslinked network, but the tensile properties of NBR with two different kinds of strong coordination bonds would be more dependent on the strain rate. In covalence-coordination crosslinked or bimetallic crosslinked NBR, the synergy between the two crosslinked networks could not only increase the strength and elongation at break of NBR but also reduce the influence of strain rate on the tensile properties of NBR.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2020
·Vol. 41
·期 5
·1711-1720
·
IF 2.265
Hongling Yi,Meiling Hu,Donggang Yao,Ting Wei,Heng Lin,Baicun Zheng
A new type of polymer derivative, carboxyl-terminated butadiene nitrile rubber-based quaternary ammonium salt (CTBN-QAS), has been synthesized and used for the functionalization of sodium montmorillonite (MMT-Na) via a cationic exchange process. The resulting CTBN-QAS-modified MMT (CTBN-QAS-MMT) exhibits exfoliated and/or intercalated structures as indicated by X-ray diffraction (XRD) analysis. Further CTBN-QAS-MMT was incorporated into diglycidyl ether of bisphenol A (DGEBA) with different loadings to produce organic/inorganic hybrid epoxy nanocomposites. Studies were conducted on tribological behavior and dynamic mechanical properties by ring-on-block wear tester and dynamic mechanical analysis, respectively. The results show that as-prepared nanostructured epoxy has better wear resistance and lower friction coefficient than pure epoxy polymer (EP), and the best wear resistance is obtained at 6 phr (parts per hundred) CTBN-QAS-MMT-modified EP. Wear surface morphology analysis shows that the friction mechanism is abrasive wear. Additionally, the good friction resistance and decreased wear loss are correlated with higher glassy storage modulus and lower tan δ . The improved tribological behavior is due to the formation of hybrid organic/inorganic nanostructured epoxy material.
研究领域:
材料科学
·
高分子化学
·
纳米技术
✓ 已验证
DOI
高影响因子
COMPOSITES COMMUNICATIONS
·
2024
·
IF 6.5
Sohail Yasin,Jianfeng Shi,Song Yihu,Chen Qi,MaioMiao Yang,Wenzhu Peng,Ce Zheng,Yang Li,Chaohua Gu
Rubber nanocomposites used for hydrogen (H 2 ) energy storage demand tailored mechanical and compressed gas permeation properties. Herein, deep eutectic solvent (DES) is used as a promising silica dispersant to mediate the mechanical and gas swelling behavior of nitrile rubber (NBR) nanocomposites. The results reveal that DES improves the mechanical deformational stress and lowers the swelling degree with well-dispersed silica in NBR, allowing the preparation of high-performance nanocomposites with potential applications in preventing H 2 leakage in high-pressure equipment facilities. Under 0.01 and 90 MPa H 2 pressures at 24 °C and 37 °C, the NBR nanocomposites with DES demonstrate lower swellings, and the improved crosslinking density and nanofillers dispersion enhance the mechanical properties while retaining the dissipation of the Mullins effect. This sheds light on the mechanical failure mechanism and the design of tailorable high-pressure rubber sealings.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
POLYMER
·
2019
·
IF 3.771
Zhiyun Li,Huilong Xu,Xinxin Xia,Yihu Song,Qiang Zheng
Mullins effect of carbon black filled nitrile butadiene rubber compounds and vulcanizates during cyclic tensile deformation is investigated and the influences of thermal annealing of the stretched samples, the deformation velocity and history and the solvent swelling are discussed. The energy losses associated with recovery hysteresis and softening accompanying the Mullins effect at a given crosshead velocity are quantitatively analyzed. The results show that the recovery hysteresis involves in microscopic deformation of the rubber phase in the nanocomposites but it disappears in the swollen samples. On the other hand, the softening is associated with both the rubber and filler phases; its energy loss increases with increasing filler content and decreases significantly by swelling. Furthermore, the softening of samples stretched at room temperatures is recoverable after conditioning at 80 °C but the recovery is retarded significantly by filler. The investigation allows gaining recognition of the important role played by the viscoelastic rubber matrix and the influence of the filler.
研究领域:
材料科学
·
高分子科学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2019
·
IF 3.771
Dan Yang,Yufeng Ni,Yingjie Xu,Xinxin Kong,Yancong Feng,Liqun Zhang
In this study, a highly efficient and cost-effective approach was developed to improve the electromechanical properties of nitrile-butadiene rubber (NBR). BaTiO 3 (BT) nanoparticles were firstly co-deposited with poly(catechol/polyamine) (PCPA) then grafted with γ-methacryloxypropyl trimethoxy silane (KH570) to form BT-PCPA-KH570 core-shell nanoparticles. The C C in KH570 participated in vulcanization with NBR rubber during crosslinking process to yield improved dispersions and interfacial interactions. This, in turn, enhanced the dielectric and electromechanical properties, as well as the dielectric strengths. The 50 phr BT-PCPA-KH570/NBR composites exhibited an actuated strain of 21.9%, which was ~4.36-folds higher than that of pure NBR (5.0%). Overall, the proposed modification route looks promising in industry for other dielectric fillers based high-performance dielectric elastomers .
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2019
·Vol. 59
·期 8
·1603-1610
·
IF 1.92
Libang Feng,Hanwen Zhao,Xia He,Yanhua Zhao,Liuxiaohui Gou,Yanping Wang
Cracks may generate in epoxy resins, which can affect the comprehensive property and shorten service life. The problem is expected to be resolved by endowing epoxy resin with self-healing performance. Herein, a new kind of self-healing epoxy resin containing both Diels–Alder (DA) bonds and nitrile butadiene rubber (NBR) has been developed. The self-healing performance and mechanical properties of as-prepared epoxy resins are investigated by qualitative observation and quantitative measuring. Results reveal that the as-prepared epoxy resins exhibit excellent self-healing performance and multiple repair ability, and the self-healing behavior is based on dual actions of thermal reversibility of DA reaction and thermal movement of molecular chains. Furthermore, the thermoreversible DA bonds contribute much to the recovery of mechanical property, while the incorporated thermoplastic NBR accelerates the whole healing process. The self-healing efficiency of epoxy resins can be enhanced markedly by introducing thermoplastic NBR. In addition, the self-healing epoxy resins also exhibit outstanding reprocessing performance, which makes it possible of recycling waste epoxy resin. POLYM. ENG. SCI., 59:1603–1610 2019. © 2019 Society of Plastics Engineers
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）