scholarly journals Elastomers based on NR/BR/SBR ternary rubber blend: Morphological, mechanical and thermal properties

2019 ◽  
Vol 25 (1) ◽  
pp. 31-38
Author(s):  
Slavisa Jovanovic ◽  
Vojislav Jovanovic ◽  
Gordana Markovic ◽  
Suzana Samarzija-Jovanovic ◽  
Zoran Milicevic ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Decomposition Temperature ◽  
Mechanical And Thermal Properties ◽  
Rubber Blends ◽  
Rubber Blend ◽  
Before And After ◽  
Elastomeric Materials ◽  
Higher Temperature ◽  
Mechanical Tensile ◽  
Styrene Butadiene

The elastomeric materials based on NR/BR/SBR ternary rubber blend were investigated. The polyisoprene (NR), butadiene (BR) and styrene butadiene (SBR) rubbers were used as network precursors and carbon black (CB) as an active filler (60 phr) for elastomeric materials preparation. For sample preparation, the mass ratio of NR to BR was constant, 1:1, but the SBR content was varied from 0 to 80 phr. The morphological, mechanical and thermal properties of prepared elastomeric materials were determined using scanning electron microscopy (SEM), mechanical tensile measurements and thermogravimetric analysis (TGA). Mechanical properties were assessed before and after thermooxidative aging during 168 h at 100 ?C. The values of tensile strength, elongation at break, and hardness decrease up to 40 phr of SBR content and after that are increasing, but abrasion resistance of ternary rubber blends increases. ?he thermal decomposition temperature obviously shifted to a higher temperature for the sample with 40 phr of SBR.

Rubber Blend of 80/20 NR/SBR Reinforced with Nanosilica and PS-Encapsulated Nanosilica

2011 ◽  
Vol 695 ◽  
pp. 332-335 ◽  
Author(s):  
Anyaporn Boonmahitthisud ◽  
Zheng Hua Song
Keyword(s):  
Sodium Dodecyl ◽  
Dry Weight ◽  
Rubber Matrix ◽  
Styrene Butadiene Rubber ◽  
Mechanical And Thermal Properties ◽  
Butadiene Rubber ◽  
Rubber Blends ◽  
Rubber Blend ◽  
Styrene Butadiene

In this study, rubber blend of natural rubber (NR) and styrene butadiene rubber (SBR) at 80/20 NR/SBR was reinforced with nanosilica (nSiO2) and polystyrene-encapsulated nanosilica (PS-nSiO2) in the latex state. The latex of PS-nSiO2 was synthesized by in situ differential microemulsion polymerization using sodium dodecyl sulfate and azobisisobutyronitrile as the surfactant and initiator, respectively. The nanoparticles at the amount of 0.1, 0.2, 0.3 and 0.4 parts per hundred of rubber (based on dry weight of nSiO2) were dispersed in the rubber blend compound and subsequently cured at 80°C for 3 h to prepare rubber nanocomposites. Using this technique, nanoparticles could be well dispersed in the rubber matrix. The influences of the nSiO2 and PS-nSiO2 on the mechanical and thermal properties of the resulting nanocomposites were quantified and compared. It is found that the tensile properties and thermal stability of the rubber blends were improved with the appropriate amounts of the nanofillers. However, the PS-nSiO2 exhibited reinforcing efficiency superior to nSiO2 with the same nSiO2 content due to the stronger rubber-filler interfacial adhesion.

Influence of Carbon Nanotubes on Mechanical and Thermal Properties of Glass Fiber Reinforced Vinyl Ester Resin Composites

2011 ◽  
Vol 675-677 ◽  
pp. 419-422 ◽  
Author(s):  
Hong Yan Chen ◽  
Zhen Xing Kong ◽  
Ji Hui Wang
Keyword(s):  
Carbon Nanotubes ◽  
Thermal Properties ◽  
Glass Fiber ◽  
Vinyl Ester ◽  
Decomposition Temperature ◽  
Mechanical And Thermal Properties ◽  
Glass Fiber Reinforced ◽  
The Matrix ◽  
Higher Temperature ◽  
Interlaminar Shear

Carbon nanotubes (CNTs) were incorporated into glass fiber/ vinyl ester resins composites to improve their mechanical and thermal properties, especially the interlaminar shear and longitudinal compressive strengths which are belong to the matrix-dominanted properties and much weaker than the fiber-dominated properties. In this study, a higher temperature initiator was added to improve the polymerization degree and raise the transition temperature (Tg). Mechanical testing indicated that by adding 0.4 wt% CNTs, the nano-filled composites attributed to 21%, 16%, 10%, and 8% improvement in interlaminar shear strength, compressive strength, tensile strength and flexural strength with respect to their counterparts without CNTs, respectively. Moreover, Thermogravimetric analysis (TGA) also exhibits approximately 14°C higher decomposition temperature than those of conventional composites.

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.

scholarly journals The effect of gamma radiation on the ageing of sulfur cured NR/CSM and NBR/CSM rubber blends reinforced by carbon black

2009 ◽  
Vol 15 (4) ◽  
pp. 291-298 ◽  
Author(s):  
Gordana Markovic ◽  
Milena Marinovic-Cincovic ◽  
Vojislav Jovanovic ◽  
Suzana Samardzija-Jovanovic ◽  
Jaroslava Budinski-Simendic
Keyword(s):  
Carbon Black ◽  
Average Particle Size ◽  
Accelerated Ageing ◽  
Average Particle ◽  
Aromatic Rings ◽  
Rubber Blends ◽  
Rubber Blend ◽  
Infrared Measurements ◽  
Elastomeric Materials ◽  
Elastomeric Composites

In this work the effect of the ?-radiation dose on ageing of carbon black reinforced elastomeric materials was studied. The compounds based on natural rubber/chlorosulfonated rubber blend (NR/CSM) and butadiene acrylonitrile rubber/chlorosulfonated rubber blend (NBR/CSM) (50:50, w/w) with different loadings (0, 20, 40, 50, 60, 80 and 100 phr) of the filler with the average particle size of 40 nm were cured by sulfur. The obtained elastomeric composites were subjected to radiation doses (100, 200, 300 and 400 kGy) in the presence of oxygen. The changes of material mechanical properties were estimated after radiation accelerated ageing. By using Fourier transform infrared measurements (ATR-FTIR) it was assessed that after exposure to doses of 100 kGy alcohols, ethers, lactones, anhydrides, esters and carboxylic acids are formed in materials. The formation of shorter polyene sequences and aromatic rings in aged samples are assumed on the basis of the obtained spectra.

scholarly journals Influence of Freeze/Thaw Cycles on Mechanical and Thermal Properties of Masonry Wall and Masonry Wall Materials

Energies ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1464 ◽  
Author(s):  
Ivanka Netinger Grubeša ◽  
Mihaela Teni ◽  
Hrvoje Krstić ◽  
Martina Vračević
Keyword(s):  
Thermal Properties ◽  
Energy Demand ◽  
Greenhouse Gas Emission ◽  
Masonry Wall ◽  
Mechanical And Thermal Properties ◽  
Historical Building ◽  
Typical Structure ◽  
Freeze Thaw ◽  
Freeze And Thaw ◽  
Before And After

In this study, the influence of freeze/thaw cycles on the mechanical and thermal properties of bricks and mortar as building parts of masonry walls, as well as the influence on the masonry wall itself is investigated. At the material level, the influence of freeze and thaw cycles on the mechanical and thermal properties of masonry components (bricks and mortar) was investigated; at the construction level, the influence of freeze and thaw cycles on the mechanical and thermal properties of a masonry wall was studied. To study the influence of freezing on the energy demand characteristics of masonry buildings, in terms of energy conservation and greenhouse gas emission, a case study was investigated on a typical structure of a historical building located in Croatia, that had undergone a process of energy certification. The applied freeze/thaw regime negatively influenced the compressive strength and the thermal properties of bricks and mortar, as well as the mechanical and thermal properties of the wall. Considering the thermal properties of the material before and after its exposure to freeze/thaw cycles, we concluded that the annual energy consumption, the heating costs, and the CO2 emission of a family house could increase up to 3.7% after frost action in the studied case.

Mechanical and Thermal Properties of Oil Palm Empty Fruit Bunch-Filled Unplasticized Poly (Vinyl Chloride) Composites

2005 ◽  
Vol 13 (6) ◽  
pp. 607-617 ◽  
Author(s):  
A. Abu Bakar ◽  
A. Hassan ◽  
A.F. Mohd Yusof
Keyword(s):  
Thermal Properties ◽  
Vinyl Chloride ◽  
Oil Palm ◽  
Flexural Modulus ◽  
Degradation Process ◽  
Decomposition Temperature ◽  
Natural Fibre ◽  
Mechanical And Thermal Properties ◽  
Empty Fruit Bunches ◽  
Poly Vinyl Chloride

Awareness of the advantages of natural fibres has stimulated interest in their use to reinforce polymers. One type of natural fibre that is of great relevance to Malaysia is oil palm empty fruit bunches (EFB). To produce EFB-filled unplasticized poly(vinyl chloride) (PVC) composites, PVC resin and the various additives were first dry-blended using a laboratory blender before being milled into sheets on a two-roll mill. Test specimens were then hot pressed, after which the mechanical and thermal properties were determined. Four untreated EFB fibre contents were employed, 10, 20, 30 and 40 phr. The increase in EFB fibre content resulted in an improvement in flexural modulus at the expense of impact strength and flexural strength. The incorporation of EFB slightly enhanced the glass transition temperature but it decreased the thermal stability of the composites, evidenced by a decrease in decomposition temperature and a change in the degradation process from two to three stages.

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