Abstract: Linear polypropylene was blended with low-density polyethylene, and the crystallization behavior was studied by DSC/POM. It showed that low-density polyethylene could decrease the peak crystallization temperature and the absolute crystallinity of linear polypropylene, however, the melt behavior was slightly affected. Moreover, the non-isothermal crystallization kinetics study showed that low-density polyethylene could also increase the amount and reduce the size of spherulites by changing the crystallization nucleation behavior of linear polypropylene. As a consequence，the foaming potentiality of the blends was enhanced.

Key words: linear polypropylene, low-density polyethylene, crystallization behavior, crystallization kinetic