Abstract: The stretching behavior of polyolefine filled with mica was studied through an Instron tensile tester, the mica surface was treated by ethylene plasma of radio frequency. The results show that the elastic modulus of HDPE, LDPE and PS filled with mica increases linearly with volume fraction of mica(V_f) and can be evaluated from the equation E = E_m(1-V_f) + AE_fV_f,where A is a measure of effectiveness of plasma treatment, subscripts m and f represent matrix and filler respectively. The breaking strength of LDPE and PS filled with mica decreases with V_f at first then tending toward a limited value which is higher when the treated mica is filled. The dependence of breaking strength of filled HDPE on V_f agrees with the generalized Nielsen's equation irrespective of plasma treating. The breaking elongation of filled PS might be enhanced by the treatment. No evidence indicating any influence of plasma treatment on breaking elongation of HDPE or LDPE filled with mica was observed.

Key words: Stress-Strain properties, Plasma, Surface treatment of fillers, Polyolefine.