CaCO3 nanoparticles in polymer matrix cause to improve in polymer performance, including thermal stability, and mechanical properties. The main goal of this paper is to investigate the effect of different weight percentage of nanoparticles of calcium carbonate on thermal stability and mechanical properties of PE nanocomposite. The morphological structure of CaCO3 nanoparticles and nanocomposites was investigated by Transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The thermal stability of PE and its nanocomposites was also determined by DSC, TGA, and TMA analysis. Non-isothermal crystallization experiments by means of DSC test showed that the incorporation of nanoparticles increased the crystallinity, glass transition temperature and the effective energy barrier for crystallization process. Besides, degradation behavior was evaluated by thermogravimetric analysis (TGA). The onset mass loss temperature shifted to higher value in the presence of nanoparticles.

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