مطالعه رفتار ريولوژيكي ديناميكي پلي اتيلن پرشده با دوده

Study on the Dynamic Rheological Behavior of Polyethylene Filled with Carbon Black

In this work the dynamic rheological behavior of high-density polyethylene (HDPE) filled with carbon black (CB) has been studied in the melt state. Dynamic rheological properties in terms of storage modulus (Gʹ).loss modulus (G") and loss factor (tan(Sigma)) have been studied for HDPE/CB composites. The frequency and temperature dependence of dynamic rheological properties of HDPE containing various concentrations and two grades of CB with different structures have been characterized. The effect of CB content (2.5-40 wt%) on the rheological properties has been investigated. These results show that when the CB concentration increases the storage and loss modulus increase and the loss factor decreases. The effect of temperature on the rheological properties has been studied and the results show that the storage and loss modulus decrease with increasing temperature, but the loss factor, in the region of low frequencies decreases with increasing temperature, while an inverse behavior is observed at high frequency region. This is an interesting point which is not reported up to the present time. The effects of CB structure on the rheological behavior of composites have been studied as well. These results show that the structure of carbon black has a signif-icant effect on the rheological behavior of filled polymeric systems.