scholarly journals The Effect of Network Structure on Compressive Fatigue Behavior of Unfilled Styrene-Butadiene Rubber

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Liu Yang ◽  
Kaikai Liu ◽  
Aihua Du
Keyword(s):  
Fatigue Resistance ◽  
Network Structure ◽  
Fatigue Behavior ◽  
Surface Damage ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Cyclic Compression ◽  
Before And After ◽  
Styrene Butadiene ◽  
Compressive Resistance

The effect of network structure on dynamic compressive fatigue behavior and static compressive mechanical properties of styrene-butadiene rubber (SBR) were investigated. A series of SBR compounds with different amounts of sulfur and dicumyl peroxide (DCP) were prepared, and their crosslinking densities were calculated using the Flory–Rehner equation. Compressive fatigue resistance and creep behavior of the vulcanizates were performed on a mechanical testing and simulation (MTS) machine. The fatigue damage surface of SBR vulcanizates before and after a dynamic compressive fatigue test was observed with a scanning electron microscopy (SEM). The results suggested that the surface of the samples was badly damaged as the number of compressive cycles increased. By comparison, compressive fatigue caused less surface damage to sulfur-cured SBR than to peroxide-cured SBR. The peroxide-cured SBR samples showed higher energy dissipation than sulfur-cured SBR during cyclic compression. The peroxide-cured SBR showed lower creep strain and compression set than the sulfur-cured SBR. The -Sx- linkages provided by the sulfur curing system allow dynamic compressive deformation but suffer from poor static compressive resistance. However, the carbon-carbon linkages from DCP are irreversible and provide higher resistance to static compressive stress, but they do not show obvious dynamic compressive fatigue resistance.

scholarly journals Compressive Fatigue Behavior of Gum and Filled SBR Vulcanizates

Polymers ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1497
Author(s):  
Liu Yang ◽  
Lin Wang ◽  
Huaiqing Guo ◽  
Aihua Du
Keyword(s):  
Carbon Black ◽  
Fatigue Resistance ◽  
Fatigue Behavior ◽  
Polymer Chains ◽  
Styrene Butadiene Rubber ◽  
Propagation Mechanism ◽  
Butadiene Rubber ◽  
Sem Images ◽  
Crack Propagation Mechanism ◽  
Styrene Butadiene

The influence of carbon black on physical mechanical properties, compressive fatigue life, and the temperature changes during compression fatigue process of styrene-butadiene rubber (SBR) vulcanizates were explored. A series of unfilled and filled SBR compounds were prepared, and the compressive fatigue behaviors of the vulcanizates were performed on a mechanical testing and simulation (MTS) machine. The top surfaces of the filled SBR were imaged using scanning electron microscopy (SEM) after 105 cycles of compressive fatigue. The filled SBR shows greater compressive fatigue resistance than the unfilled SBR. The incorporation of carbon black into SBR improves the creep resistance. The best compressive fatigue resistance for the filled SBR was achieved by the addition of 30 phr carbon black. With the increase of carbon black content, the energy dissipation and the heat build-up increase simultaneously. Furthermore, SEM images of the vulcanizates suggest that the crack propagation mechanism of the unfilled and the filled SBR was different. For the unfilled SBR, due to periodical compressive stress, the polymer chains can be destroyed, and the cracks can be easily initiated and propagated, showing serious damage on the top surfaces of the specimen. However, for the filled SBR, the carbon black agglomeration around the cracks can greatly delay the generation of the cracks, decrease the fatigue damage, and ultimately improve the fatigue resistance.

scholarly journals Laser-Textured Rubbers with Carbon Nanotube Fillers

Polymers ◽  
2018 ◽  
Vol 10 (10) ◽  
pp. 1091 ◽  
Author(s):  
Mariusz Siciński ◽  
Ewa Korzeniewska ◽  
Mariusz Tomczyk ◽  
Ryszard Pawlak ◽  
Dariusz Bieliński ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Surface Condition ◽  
Pulsed Laser ◽  
Contact Angles ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Vulcanized Rubber ◽  
Nanosecond Pulsed Laser ◽  
Before And After ◽  
Styrene Butadiene

This paper describes a method of laser ablation for improving the hydrophobic properties of vulcanized rubber. The treatment was tested on acrylonitrile rubber (NBR) and styrene butadiene rubber (SBR) containing carbon nanotubes and soot as fillers. The surface layer of the vulcanizates was modified using a nanosecond-pulsed laser at 1060 nm wavelength. The parameters of the ablation process were congruent, so no chemical changes in the polymeric material were observed. Evaluation of the surface condition of the laser-textured samples was performed using a Leica MZ6 stereoscopic microscope, operating with MultiScan 8.0 image analysis software. The contact angles were determined for all the samples before and after the surface modification process. Following modification of the surface morphology, with the best parameters of laser ablation, the contact angle increased, reaching 147°, which is very close to the threshold of superhydrophobicity (150°). On the basis of the results from several tests, laser ablation with a fiber-pulsed laser can be considered a very useful method for producing rubbers with superhydrophobic surfaces.

Preservation of Archaeological Leather by Reinforcement with Styrene Butadiene Rubber

2014 ◽  
Vol 1064 ◽  
pp. 15-20 ◽  
Author(s):  
Rushdya Rabee ◽  
Mona F. Ali ◽  
Abdel Gawaad Ali Fahmy ◽  
Sawsan Fakhry Halim
Keyword(s):  
Mechanical Properties ◽  
Ph Value ◽  
Protective Layer ◽  
Color Difference ◽  
Styrene Butadiene Rubber ◽  
Infrared Spectrometry ◽  
Butadiene Rubber ◽  
Elongation At Break ◽  
Before And After ◽  
Styrene Butadiene

Leather has been used in Egypt since 4000 BC. Ancient Egyptians used leather as shrouds, bookbinding and manuscripts. This research aims to find a way to protect archeological leather from damage by environmental factors, without losing their archaeological appearance. Leather samples were subjected to ageing in order to simulate archaeological leather. Styrene butadiene rubber was used to coat the leather samples. Then the leather samples were dipped (immersed) in a bath containing SBR dissolved in toluene with concentrations varies from 1 to 5% by weight. The effect of leather/ SBR reinforcement was evaluated by Fourier Transform Infrared Spectrometry (FTIR) and measuring the mechanical properties (tensile strength and elongation at break (%), color difference (ΔE) and lightness (L), pH value before and after ageing. In addition, Scanning Electron Microscope (SEM) was used to study the surface morphology of samples. Finally, all samples were subjected to ageing after reinforcement. The results revealed that reinforcement of leather samples by SBR solutions having concentration 3 % gave the best results among other concentrations. The mechanical properties of treated samples were enhanced with reduction in the ΔE values. The results also showed that the pH values of the treated samples did not change even after further aging. SEM scans evidenced that SBR filled the leather surface cracks besides the formation of a protective layer on the leather surface.

scholarly journals Synergistic Effect of Mica, Glass Frit and Melamine Cyanurate for Improving Fire Resistance of Styrene-Butadiene Rubber Composites Destined for Ceramizable Coatings

2018 ◽  
Author(s):  
Mateusz Imiela ◽  
Rafał Anyszka ◽  
Dariusz Bieliński ◽  
Magdalena Lipińska ◽  
Przemysław Rybiński ◽  
...  
Keyword(s):  
Synergistic Effect ◽  
Flame Retardant ◽  
Fire Resistance ◽  
Flame Retardants ◽  
Glass Frit ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Melamine Cyanurate ◽  
Before And After ◽  
Styrene Butadiene

Synergistic effect of different fillers is widely utilized in polymer technology. The combination of various types of fillers is used to improve various properties of polymer composites. In this paper a synergistic effect of flame retardants was tested for the improvement of ceramizable composites performance. The composites were based of styrene-butadiene rubber (SBR) used as polymer matrix. Three different types of flame retardants were tested for synergistic effect: Mica (phlogopite) high aspect-ratio platelets along with low softening point temperature glass frit (featuring ceramization effect) and melamine cyanurate, a commonly used flame retardant promoting carbonaceous char. In order to characterize the properties of the composites, combustibility, viscoelastic properties and mechanical properties before and after ceramization were tested. The results obtained show that the synergistic effect of ceramization promoting fillers and melamine cyanurate is especially visible with respect to the flame retardant properties resulting in a significant improvement of fire resistance of the composites.

Dependence of the network structure of cured styrene butadiene rubber on the sulphur content

Polymer ◽  
2004 ◽  
Vol 45 (17) ◽  
pp. 6037-6044 ◽  
Author(s):  
W. Salgueiro ◽  
A. Marzocca ◽  
A. Somoza ◽  
G. Consolati ◽  
S. Cerveny ◽  
...  
Keyword(s):  
Network Structure ◽  
Sulphur Content ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Styrene Butadiene

Ternary NR/BR/SBR rubber blend nanocomposites

2017 ◽  
Vol 31 (2) ◽  
pp. 265-287 ◽  
Author(s):  
Slaviša Jovanović ◽  
Suzana Samaržija-Jovanović ◽  
Gordana Marković ◽  
Vojislav Jovanović ◽  
Tijana Adamović ◽  
...  
Keyword(s):  
Testing Machine ◽  
Filler Loading ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Tensile Testing Machine ◽  
Rubber Blends ◽  
Rubber Blend ◽  
Before And After ◽  
Cure Time ◽  
Styrene Butadiene

The goal of this work was to synthesize and characterize ternary rubber blends based on polyisoprene (natural rubber (NR)), polybutadiene rubber (BR), and styrene–butadiene rubber (SBR) (NR/BR/SBR = 25/25/50) reinforced with different loading silica (SiO2) nanoparticles (0–100 part per hundred parts of rubber (phr)). The specimens were subjected to thermooxidative aging at 100°C, for two times: at 72 and 168 h, respectively, and then mechanically stretched to fracture by tension with a Zwick 1425 (Zwick GmbH, Ulm, Germany) universal tensile testing machine. Rheological and mechanical properties were used as characterization of the ternary rubber blends. The reinforcing performance of the filler was investigated using rheometric, mechanical, and swelling measurements, thermogravimetric analysis, scanning electron microscopy, and Fourier transform infrared spectroscopy with attenuated total reflectance. Hardness, tensile strength, elongation at break, and swelling degree were assessed before and after thermal aging. There was a remarkable decrease in the optimum cure time ( tc90) and the scorch time ( ts2), which was associated with a decrease in the cure rate index of (NR/BR/SBR = 25/25/50) ternary rubber blend with 60 phr of filler loading. Interaction between rubber blend and SiO2 nano-filler is confirmed by moving absorption band from 1450 cm−1 to 1480 cm−1.

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