Material Science and Engineering Seminar

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Authors: Ji Wen Liu, Tao Zhuang, Guang Shui Yu, Shu Gao Zhao
Abstract: The effects of rotor speed and discharging temperature on silica 1165MP-SSBR 5025-2 interaction as well as the mechanical properties and dynamic viscoelasticity are investigated in this work. The result shows that the discharging temperature increases linearly with increase of rotation speed, leading to increase of bound rubber content. The tensile strength, elongation at break and tear strength increase firstly, and then decrease with increase of rotation speed. However, the strength at 100% and 300% deformation decrease, and then they increase. The wet skid resistance of SSBR5025-2 filled with silica 1165MP improves with increase of rotation speed and discharging temperature, and the rolling resistance decreases.
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Authors: Jun Mei Cheng, Shu Gao Zhao
Abstract: An attempt has been undertaken to assess the effect of RP-3 jet fuel and 4109 lubricant on the mechanical, swelling properties and compression set of two kinds of fluorosilicone rubber (FSR) which are self-made and provided by Dow corning, and are marked as FSR A and FSR B respectively. Results showed that FSR B has better chemical resistance and comparable mechanical properties with that of FSR A, and are promising candidates for the development of high performance sealing materials.
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Authors: Kun Tian Dai, Ying An, Zhi Wei Jiao, Jin Yu Zhuang, Yong Xin Qin, Yu Mei Ding, Wei Min Yang
Abstract: In this paper, carbon nanotubes (CNTs) dispersion behavior in epoxy resin under synergistic effect of continuous stretching flow and ultrasound oscillation was studied. A small continuous stretching machine which could provide continuous stretching flow for polymer was designed and manufactured for studying the synergistic effect of continuous stretching flow and ultrasound oscillation on dispersive property. Firstly, the influence of different initial phase angle of dual rotor and mixing time on dispersive property were studied by preparing specimens of CNTs/epoxy resin composite under continuous stretching machine. Then, the synergistic effect of continuous stretching flow and ultrasound oscillation on dispersive property was studied with various ultrasonic power and synergistic time. In this study, the morphology of blends was characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results showed that initial phase angle of dual rotor and mixing time had great effect on the dispersion of CNTs in epoxy resin. The degree of CNTs dispersion was best when the initial phase angle of dual rotor was 0°, and increasing mixing time could improve the degree of CNTs dispersion. Increasing ultrasonic power and synergistic time were helpful to disperse CNTs in epoxy resin. It demonstrated that the synergistic effect of continuous stretching flow and ultrasound oscillation had obviously effect on the dispersion of CNTs.
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Authors: Cong Zhang, Liu Qin, Hua Chun Yu
Abstract: Super light micro foam particles of isotactic polypropylene (IPP) is prepared by the process of rapid evaporation method. The experiment uses three different heating methods which are oven, water bath and glycerol bath, respectively. The IPP’s foaming temperature is also different. The density of micro foam particles is tested. As a result, the micro foam IPP of different density and corresponding foaming temperature range can be got. The density of micro foam particles is reduced 32% than original particles. The IPP’s characteristics of micro foamed are described on different foaming temperature and different heating methods. At the same time, the reasons of different characteristics are also explained.
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Authors: Guang Shui Yu, Ji Wen Liu, Jun Mei Cheng, Chong Sun
Abstract: The formation and evolution of chemical-physical complex network during vulcanization in carbon black (CB) filled NR was investigated in this work. The results showed that the cross-linking density increased with increase of CB content. The variation of torque during vulcanization was attributed to crosslinks of macromolecular chains. The critical content of CB for the forming of CB network was between 30phr and 40phr (weight percentage). The CB content did not affect the glass transition temperature (Tg) obviously.
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Authors: Ruo Yun Wang, Jian Yun He, Ying An, Yong Kang Hu, Xin Hua Fu, Wei Min Yang, Jing Tan
Abstract: Tire simulation gradually becomes an important mean to ensure the quality of the tires. In order to guarantee the reliability of the analysis, the study on the method of obtaining the material parameters is also increasing. According to tire force situation of actual work, the acquisition method of tire rubber parameters based on simple shear test and its application in finite element analysis were studied in this paper. In this research, the international advanced dynamic mechanical analyzer was used to test the tire rubber, and the experimental results were processed by Yeoh hyper-elastic model. The hyper-elastic parameters and thus obtained could be used for finite element analysis of tires, and the simulation results showed that these parameters could be used to simulate the tire performance. In addition, the results could also provide certain guidance for the design and manufacture of tire.
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Authors: Chang Jin Li, Liang Zhao Xiong, Cong Ji Yuan, Zhi Wei Jiao, Wei Min Yang
Abstract: Electrically conducting composites with a structure of alternating (A-B-A)n layers were prepared by a novel microlayer coextrusion, which were consisted of alternating layers of polystyrene (PS) and layers of carbon black (CB)-filled polystyrene (PSCB). The co-continuous structure with selective location of CB in PSCB layers was controllable by changing the number of multiplying elements, and decreased the percolation threshold and electrical resistivity of multilayered composites because of the double percolation effect. In addition, the multilayered composites exhibited better mechanical properties than that of the conventional blends, which were related to the layered structure and small size of CB aggregates.
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Authors: Shang Zhen Guo, Tao Zhuang, Xiao Fang Luan, Shu Gao Zhao
Abstract: We researched the reinforcement effect of commercial Zinc methacrylate (ZDMA) on ethylene propylene diene monomer (EPDM), ZDMA was added to EPDM directly with hakke internal mixer. The mechanical properties, SEM, RPA and FTIR were synthetically used to study the reinforcement effect, compared with the reinforcement of CB N330. The results showed that the reinforcement effect of ZDMA on EPDM was better than that of CB N330. The tensile strength of vulcanizate with ZDMA was up to 17MPa, and the elongation at break was 493%. It could possess great resilience under the condition of high hardness. After adding ZDMA, the processing fluidity and crosslink density of EPDM were improved.
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Authors: Wei Liu, Lin Li, Bing Kai Han, Cheng Zhong Zong
Abstract: Carbon black ( CB ) and silica were used as two-component fillers to enhance the practicability of rubber. In this study, the microstructure, mechanical and dynamic properties of solution-polymerized styrene-butadiene rubber ( SSBR ) vulcanizates filled with carbon black and silica were characterized. 50 phr of total hybrid fillers was used as the base. A series of experiments with different ratios of CB/silica were carried out to determine the best contribution to the performance of SSBR vulcanizates. The studies have shown that when the vulcanizates exhibited the better overall mechanical and dynamic performance with 20 phr silica loading and 30 phr CB loading.
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