Kinetics of thermal degradation of nanometer calcium carbonate/linear low-density polyethylene nanocomposites

摘要

To improve the thermal properties of linear low-density polyethylene (LLDPE), the CaCO _3/LLDPE nanocomposites were prepared from nanometer calcium carbonate (nano-CaCO _3) and LLDPE by melt-blending method. A series of testing methods such as thermogravimetry analysis (TGA), differential thermogravimetry analysis, Kim-Park method, and Flynn-Wall-Ozawa method were used to characterize the thermal property of CaCO _3/LLDPE nanocomposites. The results showed that the CaCO _3/LLDPE nanocomposites have only one-stage thermal degradation process. The initial thermal degradation temperature T 0 increasing with nano-CaDO _3 content, and stability of LLDPE change better. The thermal degradation activation energy (E a) is different for different nano-CaCO _3 content. When the mass fraction of nano-CaCO _3 in nanocomposites is up to 10 wt %, the nanocomposite has the highest thermal degradation E _a, which is higher (28 kJ/mol) than pure LLDPE.