The crystallization behavior of low-density polyethylene (LDPE) embedded inside zinc oxide (ZnO) percolating network (LDPE/60 vol% ZnO) was investigated via differential scanning calorimetry (DSC), and compared with those of LDPE bulks (neat LDPE and LDPE/1.15 vol% ZnO). Results revealed that embedded LDPE possessed by far shorter half-crystallization time at elevated crystallization temperatures than LDPE bulks, whereas at lower crystallization temperatures longer half-crystallization time was observed. Isothermal crystallization kinetics study revealed that the Avrami exponent of embedded LDPE varied in range of 1.82.0, indicating quasi-two-dimensional crystallization with heterogeneous nucleation, contrasting with about 3 for LDPE bulks. Moreover, crystallization activation energy of embedded LDPE was much larger than that of neat LDPE due to geometric confinement effect of ZnO network. POLYM. ENG. SCI., 2012. (C) 2012 Society of Plastics Engineers