Mechanochemical preparation of devulcanized ground fluoroelastomers for the enhancement of the thermal stability of nitrile-butadiene rubber vulcanizates

2012 ◽  
Vol 126 (4) ◽  
pp. 1351-1358 ◽  
Author(s):  
Zhixing Lu ◽  
Xinxing Zhang ◽  
Dong Tian ◽  
Hua Li ◽  
Canhui Lu
Keyword(s):  
Thermal Stability ◽  
Butadiene Rubber ◽  
Nitrile Butadiene Rubber ◽  
Thermal Stability Of

Reinforcement effect of nanocellulose on thermal stability of nitrile butadiene rubber (NBR) composites

2018 ◽  
Vol 135 (32) ◽  
pp. 46594 ◽  
Author(s):  
Erfan Suryani Abdul Rashid ◽  
Nurhidayatullaili Binti Muhd Julkapli ◽  
Wageeh Abdul Hadi Yehya
Keyword(s):  
Thermal Stability ◽  
Butadiene Rubber ◽  
Reinforcement Effect ◽  
Nitrile Butadiene Rubber ◽  
Thermal Stability Of

scholarly journals Isothermal Vulcanization and Non-Isothermal Degradation Kinetics of XNBR/Epoxy/XNBR-g-Halloysite Nanotubes (HNT) Nanocomposites

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2872
Author(s):  
Seyed Mohamad Reza Paran ◽  
Ghasem Naderi ◽  
Elnaz Movahedifar ◽  
Maryam Jouyandeh ◽  
Krzysztof Formela ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Degradation Kinetics ◽  
Halloysite Nanotubes ◽  
Butadiene Rubber ◽  
Order Model ◽  
Scanning Calorimetry ◽  
Theoretical Methods ◽  
Vulcanization Kinetics ◽  
Kinetics Of ◽  
Thermal Stability Of

The effect of several concentrations of carboxylated nitrile butadiene rubber (XNBR) functionalized halloysite nanotubes (XHNTs) on the vulcanization and degradation kinetics of XNBR/epoxy compounds were evaluated using experimental and theoretical methods. The isothermal vulcanization kinetics were studied at various temperatures by rheometry and differential scanning calorimetry (DSC). The results obtained indicated that the nth order model could not accurately predict the curing performance. However, the autocatalytic approach can be used to estimate the vulcanization reaction mechanism of XNBR/epoxy/XHNTs nanocomposites. The kinetic parameters related to the degradation of XNBR/epoxy/XHNTs nanocomposites were also assessed using thermogravimetric analysis (TGA). TGA measurements suggested that the grafted nanotubes strongly enhanced the thermal stability of the nanocomposite.

Influences of NBR/Al2O3/YSZ as Fillers for PMMA Composite on the Thermal Properties

2017 ◽  
Vol 888 ◽  
pp. 198-202
Author(s):  
Ahmed Omran Alhareb ◽  
Hazizan Md Akil ◽  
Zainal Arifin Ahmad
Keyword(s):  
Thermal Stability ◽  
Thermal Properties ◽  
Butadiene Rubber ◽  
Pmma Matrix ◽  
Nitrile Butadiene Rubber ◽  
Monomer Content ◽  
Unreacted Monomer ◽  
Impact Modifier ◽  
Dsc Curves ◽  
Pmma Powder

The aim of this study is to investigate the effect of nitrile butadiene rubber (NBR as impact modifier) together with Al2O3/YSZ (toughening) as different filler ratios in PMMA material on the DSC thermal properties. PMMA matrix without fillers was mixed between PMMA powder and 0.5 wt.% of BPO and fixed at 7.5 wt.% of NBR particles with different ratios of filler (1, 3, 5, 7 and 10 wt.%) of Al2O3/YSZ mixture filler by (1:1 ratio). The TGA data were shown that the PMMA composite have better thermal stability compared to unreinforced PMMA matrix. While, DSC curves shows slightly similar in Tg value. DSC results also indicated the presence of unreacted monomer content for both reinforced and unreinforced PMMA composites. As conclusion of this study, the reinforced PMMA composites are improved in thermal stability compared to unreinforced PMMA matrix.

scholarly journals Dispersibility of Kaolinite-Rich Coal Gangue in Rubber Matrix and the Mechanical Properties and Thermal Stability of the Composites

Minerals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1388
Author(s):  
Kenan Zhang ◽  
Hao Zhang ◽  
Linsong Liu ◽  
Yongjie Yang ◽  
Lihui Liu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Coal Gangue ◽  
Rubber Matrix ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Scanning Calorimetry ◽  
Laser Scattering ◽  
X Ray ◽  
Thermal Stability Of

The aim of this work was to investigate the dispersibility of kaolinite-rich coal gangue in rubber matrix, the mechanical properties and thermal stability of coal gangue/styrene butadiene rubber (SBR) composites, and to compare these properties to those of the same coal gangue but had undergone thermal activation and modification. Several experimental techniques, such as X-ray diffraction (XRD), X-ray fluorescence (XRF), scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), thermogravimetric-differential scanning calorimetry (TG-DSC), laser-scattering particle analyzer were adopted to characterize the coal gangue particles and then the obtained composites. The results demonstrated the raw coal gangue (RCG) was mainly composed of kaolinite. Calcination led to amorphization of thermal activated coal gangue (ACG), increased hydrophilicity and void volume, and decreased pH. The grain size of ACG became coarser than RCG, but ACG turned loose confirmed by higher degree of refinement after grinding. Modification enhanced the hydrophobicity of the coal gangue and improved its dispersibility than fillers without modification. Calcined samples had better dispersibility than uncalcined fillers. Additionally, the coal gangue treated by calcinating, grinding and modifying (MGA) had the best dispersion in rubber matrix. Either calcination or modification could improve the mechanical properties and thermal stability of coal gangue filled rubber, while the performance of MGA reinforced SBR (MGA-SBR) was the best. The enhanced performance of the MGA-SBR was owed to better dispersion of particles as well as stronger interactions between particles and rubber macromolecules.

scholarly journals Thermostability and surface morphology of nano- and micro-filled NBR/CSM rubber blends

2004 ◽  
Vol 69 (2) ◽  
pp. 167-173 ◽  
Author(s):  
G. Markovic ◽  
Blaga Radovanovic ◽  
J. Simendic-Budinski ◽  
Milena Marinovic-Cincovic
Keyword(s):  
Thermal Stability ◽  
Surface Morphology ◽  
Attenuated Total Reflectance ◽  
Butadiene Rubber ◽  
Nano Particle ◽  
Scanning Calorimetry ◽  
Rubber Blends ◽  
Ethylene Thiourea ◽  
Chlorosulphonated Polyethylene ◽  
Thermal Stability Of

Acrylonitrile-butadiene rubber (NBR), polychloroprene rubber (CR) chlorosulphonated polyethylene rubber (CSM) and their blends were cross-linked with sulphur, ethylene- thiourea, magnesium oxide or their combination. The effect of nano- and micro- particle sized of 35 pphr SiO2 on the thermostability and surface morphology of all the crosslinked systems was investigated. Identification of the structure of nano- and micro- particle sized SiO2 filled NBR/CSM and CR/CSM crosslinked systems was carried out by Fourier transform infrared spectroscopy (FTIR) with an attenuated total reflectance (ATR) extension. The thermal stability of the nano- and micro particle sized SiO2 filled NBR/CSM and CR/CSM crosslinked systems were carried out by thermogravimetric analysis (TGA). The glass transition temperature (Tg) of the samples was determined by differential scanning calorimetry (DSC). The morphology of the fracture surface of the crosslinked systems was carried out by scanning electron microscope (SEM). The results show when filledwith nano-particle sized of SiO2 NBR/CSM and CR/CSM polymer matrix have a strong peak from SiO?C at 1079 cm-1. This suggests the an interaction between the SiO2, which should lead to an increased thermal stability, higher values of Tg, better dispersion the nano-SiO2 andmore polish, without cracks than micro-filled NBR/CSM and CR/CSM crosslinked systems.

scholarly journals Tribological Performance and Thermal Stability of Nanorubber-Modified Polybenzoxazine Composites for Non-Asbestos Friction Materials

Polymers ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2435
Author(s):  
Chanchira Jubsilp ◽  
Jakkrit Jantaramaha ◽  
Phattarin Mora ◽  
Sarawut Rimdusit
Keyword(s):  
Thermal Stability ◽  
Tribological Performance ◽  
Mechanical And Thermal Properties ◽  
Butadiene Rubber ◽  
Friction Modifiers ◽  
Friction Materials ◽  
Wear Rates ◽  
Degradation Temperature ◽  
Viscoelastic Behaviors ◽  
Thermal Stability Of

Asbestos-free friction composite based on ultrafine full-vulcanized acrylonitrile butadiene rubber particles (UFNBRPs)-modified polybenzoxazine was successfully developed. The UFNBRPs-modified polybenzoxazine friction composite was characterized for chemical, tribological, and mechanical properties as well as thermal stability. The UFNBRPs not only act as a filler to reduce noise in the friction composites due to their suitable viscoelastic behaviors but also play a key role in friction modifiers to enhance friction coefficient and wear resistance in the polybenzoxazine composites. The chemical bonding formation between UFNBRPs and polybenzoxazine can significantly improve friction, mechanical, and thermal properties of the friction composite. The outstanding tribological performance of the friction composite under 100–350 °C, i.e., friction coefficients and wear rates in a range of 0.36–0.43 and 0.13 × 10−4–0.29 × 10−4 mm3/Nm, respectively, was achieved. The high flexural strength and modulus of the friction composite, i.e., 61 MPa and 6.4 GPa, respectively, were obtained. The friction composite also showed high thermal stability, such as 410 °C for degradation temperature and 215 °C for glass transition temperature. The results indicated that the obtained UFNBRPs-modified polybenzoxazine friction composite meets the industrial standard of brake linings and pads for automobiles; therefore, the UFNBRPs-modified polybenzoxazine friction composite can effectively be used as a replacement for asbestos-based friction materials.

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