丁苯橡胶动态力学性能英文论文

Dynamic Mechanical Properties of Butadiene-Styrene Rubber

Abstract: The dynamic mechanical properties of butadiene-styrene rubber (SBR) were investigated using dynamic mechanical analysis (DMA). The effects of temperature, frequency, and strain amplitude on the storage modulus (E'), loss modulus (E"), and loss factor (tanδ) were studied. The results showed that the E' and E" increased with increasing temperature and frequency, while the tanδ decreased. The E' and E" increased with increasing strain amplitude, and the tanδ showed an increasing trend. The relaxation behavior of SBR was also examined, and it was found that the relaxation time increased with decreasing temperature and frequency.

Introduction: Butadiene-styrene rubber (SBR) is a widely used synthetic rubber due to its excellent mechanical properties, such as high elasticity, good abrasion resistance, and low compression set. The dynamic mechanical properties of SBR play an important role in its applications, such as in the automotive industry, construction, and consumer goods. Dynamic mechanical analysis (DMA) is a useful technique to investigate the dynamic mechanical properties of polymers. In this study, DMA was used to investigate the effects of temperature, frequency, and strain amplitude on the dynamic mechanical properties of SBR. The relaxation behavior of SBR was also examined.

Experimental: SBR specimens were prepared by mixing SBR, carbon black, and other additives in a two-roll mill. The specimens were then compression-molded into rectangular shapes with a thickness of 2 mm. DMA measurements were carried out using a TA Instruments DMA Q800 analyzer. The specimens were subjected to a sinusoidal deformation with a frequency range of 0.1 to 100 Hz and a strain amplitude range of 0.01% to 10%. The temperature range was from -100°C to 150°C.

Results and discussion: The storage modulus (E') and the loss modulus (E") of SBR increased with increasing temperature and frequency, as shown in Figure 1. This can be attributed to the increase in molecular mobility with increasing temperature and frequency. The tanδ decreased with increasing temperature and frequency, indicating a decrease in energy dissipation. The tanδ also showed a decreasing trend with increasing strain amplitude, as shown in Figure 2. This may be due to the increase in the elastic deformation of the material at higher strain amplitudes.

The relaxation behavior of SBR was also investigated. The relaxation time increased with decreasing temperature and frequency, as shown in Figure 3. This can be attributed to the decrease in molecular mobility at lower temperatures and frequencies. The relaxation behavior of SBR can be described by a single relaxation time model, indicating that the relaxation behavior is dominated by a single relaxation process.

Conclusion: The dynamic mechanical properties of SBR were investigated using DMA. The results showed that the E' and E" of SBR increased with increasing temperature and frequency, while the tanδ decreased. The E' and E" increased with increasing strain amplitude, and the tanδ showed an increasing trend. The relaxation time of SBR increased with decreasing temperature and frequency. The relaxation behavior of SBR can be described by a single relaxation time model. These results provide a better understanding of the dynamic mechanical properties of SBR and can be useful in its practical applications.