One‐step Synthesis of End‐Functionalized Hydrogenated Nitrile‐Butadiene Rubber by Combining the Functional Metathesis with Hydrogenation

Liu, Juan; Sun, Jingyu; Zhang, Zhengguo; Yang, Hui; Nie, Xiaojuan

doi:10.1002/open.201900369

Cited by 16 publications

(9 citation statements)

References 38 publications

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“…The mixture solutions comprising MF copolymers and HNBR in DMSO also produced physical interactions, as shown in the 1 H NMR spectra (Figure S3). Pristine HNBR showed peaks at around 2.95 and 1.2 ppm, corresponding to a proton adjacent nitrile group and alkyl chain repeating units of the hydrogenated part, respectively. , Upon addition of MF copolymers during high-shear mixing, the peak at 2.95 ppm originated from protons adjacent to CN functional groups are almost the same with that after 20 min (2.94 ppm). One peak from the alkyl chains (1.19 ppm) may also have shifted and overlapped with a butanol peak at approximately 1.21 ppm during mixing.…”

Section: Results and Discussionmentioning

confidence: 82%

Multifunctional Additives for High-Energy-Density Lithium-Ion Batteries: Improved Conductive Additive/Binder Networks and Enhanced Electrochemical Properties

Ahn

Park

Kim

et al. 2021

ACS Appl. Mater. Interfaces

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Cylindrical-type cells have been widely adopted by major battery and electric vehicle manufacturers owing to their price competitiveness, safety, and easy expandability. However, placement of electrodes at the core of cylindrical cells is currently restricted because of high electrode curvature and the lack of specialized electrodes and electrode materials. Here, we report the realization of highly flexible high-energy-density electrodes (active material loading of >98.4%) that can be used at the cores of cylindrical cells. The improved properties result from the introduction of a multifunctional poly(melamine-co-formaldehyde) (MF copolymer) additive, which yields a relatively more fluidic and well-dispersed slurry using only 0.08 wt %. MF copolymer-mediated formation of completely wrapped CNT/PVDF networks on LiCoO 2 (LCO) and accompanying contact enhancement between LCO and carbon nanotubes (CNTs) resulted in an increase of electrical and mechanical properties of the two types (composites with or without collectors) of electrodes compared with those of additive-free electrodes. Flexibility tests were carried out by rolling electrodes onto cylinder substrates (diameters of ca. 1 and 10 mm); this process resulted in relatively lower resistance changes of the MF copolymer-containing electrodes than for the reference electrodes. In addition, capacity retention after 100 cycles for cells with and without MF copolymers was approximately 10−20% better for the samples with the MF copolymer than for those without. CNT/PVDF networks with MF copolymers were proven to induce a relatively thin and stable cathode electrolyte interface layer accompanying the chemical bond formation during cycling.

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Section: Results and Discussionmentioning

confidence: 82%

Multifunctional Additives for High-Energy-Density Lithium-Ion Batteries: Improved Conductive Additive/Binder Networks and Enhanced Electrochemical Properties

Ahn

Park

Kim

et al. 2021

ACS Appl. Mater. Interfaces

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“…The peaks of 1.0–2.5 ppm are assigned to the saturation protons. The peak at 2.53 ppm indicates the proton of –CN [ 5 , 25 ]. The successful grafting reactions are confirmed by the presence of the new peak at 4.2 ppm, which is ascribed to the proton of –COOCH 2 − [ 29 , 30 ].…”

Section: Resultsmentioning

confidence: 99%

“…However, due to the existence of unsaturated bonds on the molecular chain, it shows poor aging resistance. Hydrogenated nitrile rubber (HNBR) is the product of selective hydrogenation of NBR, which retains the original excellent performances of NBR and improves the ability of heat resistance, acid and alkali resistance and aging resistance [ 4 , 5 , 6 , 7 ]. However, HNBR is easy to crystallize due to the nearly ordered polyethylene structure of main chain [ 8 , 9 ], which causes an increase of T g .…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Low Temperature Resistant Hydrogenated Nitrile Rubber Based on Esterification Reaction

Lin

et al. 2021

Polymers

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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 Tg of −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.

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“…The spectra obtained on the NBR and NBR waste/10% PDMS in relation to the virgin NBR rubber (Figure 1), highlight specific groups, namely: the bands from 2918, 2849 and 1450 cm -1 (stretching and deformation vibration of the -C-H bond), the band from 2238 cm -1 (stretching vibration of the -CN bond), the band from 1539 cm -1 (the stretching vibration of the -CN bond, from the additives added into the rubber). The band from 967 cm -1 comes from the -C=C-double bond (1.4 trans) (Liu et al, 2020;Samantarai et al, 2019). Additionally in the spectrum of NBR waste (not modified) intense bands at 1078 cm -1 originated from the Si-O-Si group (silicon dioxide) can be observed.…”

Section: Primary Identification Process (Ftir Analysis)mentioning

confidence: 98%

The Influence of NBR Waste Modified with SiO2/Not Modified on Processability, Physical-Mechanical and Structural Properties of PVC

Sönmez¹,

Niţuică²,

Georgescu³

et al. 2022

Proceedings of the 9th International Conference on Advanced Materials and Systems

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The finished products made of PVC and NBR after the end of the life (waste) are considered harmful, because they do not degrade and thus remain for a long time in the environment. Therefore, there is intense research in order to recycle such materials and reintroduce them into the productive cycle in a new form, without compromising very much their mechanical properties. In the case of rubber recycling, there are currently several methods, from reducing the dimensions to expensive devulcanization processes in order to use them in different thermoplastic matrices. However, the simple reduction of the size of the vulcanized rubber and the mixing with PVC, leads to weak mechanical properties, due to the incompatibility and immiscibility between the phases. Such a composite material was obtained using recycled vulcanized NBR rubber particles (0.35 mm) unmodified/ modified with 10% PDMS, in virgin PVC matrix and waste PVC (50:50) and in the presence of the genioplast additive by the homogeneous mixing technique in the Brabender mixer. The materials experimented were analyzed structurally – FTIR, rheological (torque versus time), from the point of view of processability (flow index) but also mechanically. The analysis of the physico-mechanical values shows that the addition of 10% NBR in the PVC matrix reduces the tensile strength, the 100 and 300% modulus, the elongation at the break, the tear due to their agglomeration, reduce processability (based on the MFR obtained values) but improve the abrasion resistance, an important property of the materials used especially in the footwear industry. However, these types of materials can be used in other applications (automotive, agriculture, etc.) where very high resistances are not required.

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One‐step Synthesis of End‐Functionalized Hydrogenated Nitrile‐Butadiene Rubber by Combining the Functional Metathesis with Hydrogenation

Cited by 16 publications

References 38 publications

Multifunctional Additives for High-Energy-Density Lithium-Ion Batteries: Improved Conductive Additive/Binder Networks and Enhanced Electrochemical Properties

Multifunctional Additives for High-Energy-Density Lithium-Ion Batteries: Improved Conductive Additive/Binder Networks and Enhanced Electrochemical Properties

Synthesis of Low Temperature Resistant Hydrogenated Nitrile Rubber Based on Esterification Reaction

The Influence of NBR Waste Modified with SiO2/Not Modified on Processability, Physical-Mechanical and Structural Properties of PVC

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