Compressive Fatigue Behavior of Gum and Filled SBR Vulcanizates

被引:8
|
作者
Yang, Liu [1 ]
Wang, Lin [1 ]
Guo, Huaiqing [1 ]
Du, Aihua [1 ]
机构
[1] Qingdao Univ Sci & Technol, Minist Educ, Key Lab Rubber Plast, Qingdao 266042, Peoples R China
关键词
styrene-butadiene rubber; fatigue; compressive stress; carbon black; creep; MECHANICAL-PROPERTIES; NATURAL-RUBBER; WEAR BEHAVIOR; COMPOSITES; STRESS;
D O I
10.3390/polym13091497
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
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.
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页数:10
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