The mechanical properties of ozonized high density polyethylene (HDPE) blended with sericite-tridymite-cristobalite (STC) were studied in this paper. The experimental results show that some oxygen containing polar groups are introduced on the molecular chain of HDPE through ozonization

the compatibility between HDPE and STC is thus improved

the mechanical properties of the blend are markedly enhanced. Compared with untreated HDPE/STC (60/40) blend

the yield strength and notched impact strength of ozonized HDPE/STC (60/40) blend are increased from 27.0 MPa to 29.5 MPa and from 2.8 kJ/m2 to 13.3 kJ/m2

respectively

the notched impact strength is close to that of HDPE (13.6 kJ/m2)

the yield strength is in excess of 3.9 MPa of that of HDPE. The yield strength and notched impact strength will be further increased to 30.7 MPa and 32.4 kJ/m2 in case the ozonized HDPE is blended with STC pretreated with silane coupling agent.