New Tin-Functionalized Integrated Rubber for High Performance Green Tire Tread

2010 ◽  
Vol 150-151 ◽  
pp. 805-810 ◽  
Author(s):  
Yi Bing Xu ◽  
Ni Ni Wang ◽  
Guo Zhu Yu ◽  
Lin Xu ◽  
Chuan Qing Li
Keyword(s):  
Anionic Polymerization ◽  
High Performance ◽  
Dynamic Properties ◽  
Rolling Resistance ◽  
High Property ◽  
Living Anionic Polymerization ◽  
Dynamic Viscoelasticity ◽  
Static Mechanical ◽  
Heat Build Up ◽  
Static Mechanical Properties

A novel Tin-functionalized integrated rubber of styrene-isoprene-butadiene tri-copolymer (SIBR) was prepared in the styrene (St)/isoprene (Ip) /butadiene (Bd) system with self-made tin-containing organolithium (simplified as SnLi) as initiator via living anionic polymerization. By means of several measures such as TEM, SEM and dynamic viscoelastometer, morphology, static mechanical properties, wear ability, dynamic heat build-up and dynamic viscoelasticity of Tin-functionalized SIBR (Sn-SIBR) were studied and compared with non-functionalized SIBR and NR/S-SBR (40/60) blend. The result shows that with improving antiskid properties and wear resistance, Sn-SIBR reduces the rolling resistance over 30%, which has excellent mechanic properties and dynamic properties. Sn-SIBR satisfies the overall property requirements of high-performance tire tread, and it is an ideal new style tread material for high-property environmental green tire.

Investigation of Fatigue Properties for Welded Aluminum Forging Preforms

2008 ◽  
Author(s):  
W. P. Harris ◽  
J. P. Domblesky
Keyword(s):  
Dynamic Properties ◽  
Weld Zone ◽  
Fatigue Properties ◽  
Test Machine ◽  
Forged Parts ◽  
Aluminum Forging ◽  
Static Mechanical ◽  
Potential Benefits ◽  
Metallurgical Evaluation ◽  
Static Mechanical Properties

While welded forging preforms offer potential benefits for producing forged parts, work to date has mainly been concentrated on assessing static mechanical properties. As dynamic properties are an important consideration, the objective in the current study was to assess the high cycle fatigue properties of 6061-T6 aluminum forging performs which were prepared using friction welding. Monolithic and friction welded specimens were prepared and hot worked using a laboratory press. Fatigue data was then generated using a rotating beam test machine and a metallurgical evaluation of the weld zone performed. The results showed that, in general, forged preforms demonstrated superior fatigue life when compared to as-friction welded preforms in the same temper condition. Fatigue performance was also found to be comparable to that obtained from monolithic forging preforms which had an identical processing history.

Reduced Hysteresis in Truck Tread Compounds by Using Aramid Short Fibers

2006 ◽  
Vol 79 (1) ◽  
pp. 26-38 ◽  
Author(s):  
R. N. Datta
Keyword(s):  
Dynamic Properties ◽  
Rolling Resistance ◽  
Fiber Content ◽  
Short Fibers ◽  
Performance Properties ◽  
Engineering Component ◽  
Wear And Tear ◽  
Heat Build Up ◽  
Hysteresis Characteristics ◽  
Positive Effect

Abstract The preparation of an intricate engineering component can be accomplished by using aramid short fibers as the reinforcing medium of an elastomer, especially tread compounds with a target to improve hysteresis without sacrificing other performance properties. For many years short fibers have been used to reinforce all sorts of rubbers. Particularly compounds with relatively low fiber content have been successful in improving hose and belt performance. The use of aramid short fibers, for example, poly-paraphenylene terephthalamide, PPTA (Twaron), poly-(metaphyneleneisophthalamide, MPIA (Conex) and co-poly-(paraphenylene/3,4′-oxydiphenylene terephthalamide, PP/ODPTA (Technora) have been explored in typical truck tread compounds with an objective to improve hysteresis, thereby reducing rolling resistance. This paper presents the results on our latest research in this area focusing on improvement in rolling resistance, heat build up, flex, and dynamic properties. Compounds have been engineered to improve the hysteresis characteristics with a positive effect on wear and tear resistance. Furthermore, the levels of fibers and their sizes have been varied to obtain best performance advantage. This paper will provide a snapshot of all advantages that can be obtained by addition of small amount of fibers, often in a way which is impossible with conventional particulate fillers or with other fibers.

scholarly journals Effects of Modified Nano-SiO2 Particles on Properties of High-Performance Cement-Based Composites

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 646 ◽  
Author(s):  
Zhidan Rong ◽  
Mingyu Zhao ◽  
Yali Wang
Keyword(s):  
Mechanical Properties ◽  
Coupling Agent ◽  
High Performance ◽  
Silane Coupling Agent ◽  
Nano Sio2 ◽  
Nucleation Effect ◽  
Silane Coupling ◽  
Static Mechanical ◽  
Sio2 Particles ◽  
Static Mechanical Properties

In this research, silane coupling agent was used to modify the surface of nano-SiO2, particles and the effects of modified nano-SiO2 particles on the mechanical properties of high-performance cement-based composites and its mechanism were systematically studied. The results indicated that the optimum modification parameters were a coupling agent content of 10%, reaction temperature of 65 °C, and reaction time of 8 h. Compared with the unmodified nano-SiO2, the modified nano-SiO2 promoted and accelerated the hydration process of cement. The pozzolanic effect, filling effect, and nucleation effect of modified nano-SiO2 made the microstructure of the composite more compact, and thus improved static mechanical properties of cement-based composites.

Effect of Carbon Black Structures towards Heat Build-Up Measurements and its Dynamic Properties

2015 ◽  
Vol 1134 ◽  
pp. 131-137 ◽  
Author(s):  
Mohd Ismail Rifdi Rizuan ◽  
Mohammad Azizol Abdul Wahab ◽  
Ahmad Zafir Romli
Keyword(s):  
Carbon Black ◽  
Dynamic Properties ◽  
Loss Modulus ◽  
Rolling Resistance ◽  
Testing Procedure ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
High Carbon ◽  
Heat Build Up ◽  
Styrene Butadiene

The aim of this study is to investigate the effect of different carbon black structures towards heat build-up measurements and its dynamic properties such as tangent delta, loss modulus and storage modulus on the industrial rubber compounds containing Natural Rubber (NR) and Styrene Butadiene Rubber (SBR). Different carbon black structures were used and characterised with respect to their rheological and physical properties. Heat Build-up test is a testing procedure which is used to measure the rate of heat generated by the rubber vulcanisates when subjected to rapidly oscillating compressive stresses or strain under controlled conditions. It was found that NR compound containing low and high carbon black structures; N375 and N339 produced lower heat generation compared to NR/SBR blends that filled with the same type of carbon black fillers. It shows that NR with low and high carbon black structures exhibits low heat build-up (surface and intrinsic) with a balance of good traction and low rolling resistance for application in tyre.

Experimental Quantification of the Evolution of the Static Mechanical Properties of Tight Sedimentary Rocks during Increasing-amplitude Load and Unload Cycling

Geophysics ◽  
2021 ◽  
pp. 1-50
Author(s):  
Yang Wang ◽  
Luanxiao Zhao ◽  
De-Hua Han ◽  
Qianqian Wei ◽  
Yonghao Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Nonlinear Elasticity ◽  
Strain Amplitude ◽  
Dynamic Properties ◽  
Sedimentary Rocks ◽  
Hydrocarbon Exploration ◽  
Static Properties ◽  
Static Mechanical ◽  
Stress Cycling ◽  
Static Mechanical Properties

Understanding the linearly and nonlinearly elastic behaviors of tight reservoir rocks is crucial for numerous geophysical and geomechanical applications in hydrocarbon exploration and production, geological repositories for greenhouse gases, and geothermal energy exploitation. We perform a suite of triaxial load and unload cycling tests with increasing stress amplitudes on three tight sedimentary rocks to explore the evolution of their static mechanical properties (Young’s modulus and Poisson’s ratio). We intend to depict the transition from linear to nonlinear elasticity by combining static measurements with dynamic measurements. The experimental results suggest that static mechanical properties increase upon load stress cycling but decrease upon unload stress cycling. Upon the increasing-amplitude unload cycling, static mechanical properties gradually decrease from values approaching dynamic properties to values closer to static properties upon load cycling. By quadratically fitting the static mechanical properties as functions of the strain amplitude in the process of unload cycling, we define a characteristic strain amplitude of about 5 × 10−5 to distinguish the linearly elasticity-dominated and nonlinearly elasticity-dominated behaviors for three tight rocks. Such transitional behavior in tight sedimentary rocks can be microscopically explained by the gradual activation of friction-controlled sliding from the beginning of the cyclic stress unload. These observations provide direct experimental evidence of the transition from linear to nonlinear elasticity for tight sedimentary rocks during the laboratory static measurements, which will facilitate understanding of the dynamic-static parameter correlation and the modeling of rock deformations in geoscience or geoengineering applications.

scholarly journals Superior thermomechanical and wetting properties of ultrasonic dual mode mixing assisted epoxy-CNT nanocomposites

2017 ◽  
Vol 31 (1) ◽  
pp. 32-42 ◽  
Author(s):  
MS Goyat ◽  
Vikram Jaglan ◽  
Vikram Tomar ◽  
Guillaume Louchaert ◽  
Arun Kumar ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Performance ◽  
Functional Materials ◽  
Significant Enhancement ◽  
Tensile Fracture ◽  
Average Roughness ◽  
Wetting Properties ◽  
Static Mechanical ◽  
Highly Hydrophobic ◽  
Static Mechanical Properties

High-performance epoxy-carbon nanotube (CNT) nanocomposites were prepared by simultaneous use of ultrasonication and mechanical stirring. The dynamic and static mechanical properties and wetting properties of the nanocomposites were investigated. The dynamic mechanical analysis presented significant enhancement in storage modulus (approximately 124%) and glass transition temperature (approximately 25.6%) of epoxy-CNT nanocomposite at an optimized concentration of the CNT (0.25 wt%) possibly due to the formation of a strong interface between the epoxy and CNT. The tensile test results showed the significant improvement in tensile strength (approximately 47%) and Young’s modulus (approximately 40%) of the epoxy-CNT (0.25 wt%) nanocomposite without significantly affecting its stiffness. The homogeneous dispersion of CNTs in the epoxy matrix resulted in the significant enhancement in the dynamic and static mechanical properties of the nanocomposites. The hydrophilic character of the neat epoxy was tuned to a highly hydrophobic one by incorporation of CNTs in it. A direct relation between the average roughness of the tensile fracture surfaces and the contact angle of the nanocomposites was identified with respect to the concentration of the CNTs. These high-performance highly hydrophobic nanocomposites have the great potential to be used as the structural and functional materials in humid environments.

scholarly journals Static mechanical properties and mechanism of C200 ultra-high performance concrete (UHPC) containing coarse aggregates

2020 ◽  
Vol 27 (1) ◽  
pp. 186-195 ◽  
Author(s):  
Lv Yujing ◽  
Zhang Wenhua ◽  
Wu Fan ◽  
Wu Peipei ◽  
Zeng Weizhao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Performance ◽  
Coarse Aggregate ◽  
High Performance Concrete ◽  
Maximum Size ◽  
X Ray Diffraction ◽  
Ultra High Performance Concrete ◽  
Coarse Aggregates ◽  
Static Mechanical ◽  
Static Mechanical Properties

AbstractIn this paper, C200 ultra-high performance concrete (UHPC) containing coarse aggregate was prepared. Firstly, four different maximum size and three different type of coarse aggregate having significant differences in strength, surface texture, porosity and absorption were used to prepared the mixtures. Secondly, the effect of maximum size and type of coarse aggregate on the workability of the fresh UHPC and the mechanical behaviour of harden UHPC were investigated. Finally, a series micro-tests including mercury intrusion porosimetry (MIP), scanning electron microscope (SEM), X-ray diffraction (XRD) were conducted and the mechanism of the C200 UHPC were discussed.The results show that the type and maximum size of coarse aggregate have significant effect on the workability and mechanical properties of C200 UHPC. The basalt coarse aggregate with maximum size of 10mm can be used to prepare the C200 UHPC. The compressive strength and flexural strength of the C200 UHPC is 203MPa and 46MPa at 90 day, respectively. Besides, the micro-tests data show that the C200 UHPC has a compacted matrix and strong interface transition zone (ITZ), which make the aggregate potential strength fully used.

Living Anionic Polymerization of 4-Halostyrenes

2021 ◽  
Vol 54 (3) ◽  
pp. 1489-1498
Author(s):  
Raita Goseki ◽  
Taro Koizumi ◽  
Reina Kurakake ◽  
Satoshi Uchida ◽  
Takashi Ishizone
Keyword(s):  
Anionic Polymerization ◽  
Living Anionic Polymerization
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