Effect Of Magnetic Field And Electric Field On Dielectric Properties Of Polyolefin Matrix Composites

Matrix composites consist of two or more than two materials, and the performance of each component produces mutual complementary and synergistic effects, making the comprehensive performance of composites better than Original constituent materials, even deriving some new functions. At present ,Polyolefin /Inorganic filler matrix composite is a very extensive class of composite materials, whose performance depends on the performance of polyolefin and Inorganic filler,the substitutability of Inorganic filler and its distribution state, etc. As a soft-matter, the structure and performance of polyolefin are easily affected by the external field stimulation, and the micron, nanometer scale inorganic filler is respond sensitively to the external field stimulation, therefore, the research about the effect on the structure and performance of Polyolefin matrix composites by the external field stimulation draws many domestic scientific researchers' attention, and the external field processing may become an effective method of making auxiliary preparations of new, high-performance Polyolefin matrix composites.This subject separately applied electric field and magnetic field or applied both at the same time on Polyolefin/CNTs,Polyolefin,nano-SiC matrix composites in the hot-press-molding process ,studied the effects and regular patterns of magnetic,electric treatment on the properties of matrix composites and analyzed the function mechanism. The results show that : separately applying electric field and magnetic field makes Polyolefin/CNTs in Polyolefin orient along the external field stimulation direction and changes the distribution state of nano-SiC ,leading to the conductivity,dielectric constant dissipation factor of nano-composites varying in degree; with the decrease of melting viscosity and the increase of pretreatment electric intensity, effect of magnetic field and electric field on properties of Polyolefin matrix composites is more obvious; the effect of non-uniform electric field processing on nano-composites is much better than that of uniform electric field processing; the effects of electric field and magnetic field processing on the same nano-composites are different, the effect of electric field and magnetic field joint processing either may have the synergy, or get close to the effect of either separate field, and the results mainly depend on the properties of Polyolefin and Inorganic filler.