| Evolution of microstructure and properties of silica/natural rubber composites during fatigue process |
| Received:September 01, 2015 Revised:September 01, 2015 |
| DOI： |
| Key Words: Natural rubber; silica; fatigue; dispersion; crosslink density; |
| Author Name | Affiliation | E-mail | | a* | 北京化工大学 有机无机复合材料国家重点实验室 | wensp@mail.buct.edu.cn | | a | 北京化工大学 有机无机复合材料国家重点实验室 | | | a | 北京化工大学 有机无机复合材料国家重点实验室 | | | a | 北京化工大学 有机无机复合材料国家重点实验室 | | | a | 北京化工大学 有机无机复合材料国家重点实验室 | |
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| Abstract: |
| In this research, the uniaxial fatigue machine was utilized to fatigue the silica/NR composites with different cycles. Microstructure and properties of samples subjected to different fatigue cycles were characterized. Transmission electron microscope showed that the dispersion of silica and filler network became good at the first fatigue stage, and then became bad at the last fatigue stage. Crosslink density obtained by swelling method also decreased first, then increased, and finally decreased during the fatigue process, indicating that the dispersion of silica and filler network experienced a destroy-reconstruction-destroy process. DMA results showed that the glass-transition temperature decreased firstly and then increased during the whole fatigue process. After 100000 fatigue cycles, the filler dispersion was uniform, and the Payne effect decreased significantly. Mechanical properties tests showed that the mechanical properties of samples subjected to 50000-10000 fatigue cycles were higher than that of original samples. |
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