A study of dielectric relaxation in aluminosilicate-filled low-density polyethylene

Space charge formation in low-density polyethylene (LDPE) filled with zeolites and clays has been investigated by the thermally stimulated current method. The presence of fillers affects the dielectric properties due to additional dielectric relaxation phenomena, which depend on the structure of the inorganic filler. Pores or cages existing in the zeolite frame enable their compensated ions to move away from their neutral position under electric field to form dipoles of very low activation energy and high attempt-to-escape frequency. The activation energy is related to the pore sizes of zeolites. However, kaolin-based clay which has movable cations on its surfaces form an interfacial dipole between the LDPE and clay. A 'Maxwell-Wagner' interfacial relaxation behavior was observed in the clay-filled LDPE system. The activation energy of interfacial relaxation of the clay-filled LDPE system is higher than that of dipole relaxation of the zeolite-filled LDPE. >

[1]  R. Fleming,et al.  Simultaneous thermally stimulated luminescence and depolarization current in low density polyethylene , 1991, [1991 Proceedings] 7th International Symposium on Electrets (ISE 7).

[2]  R. Fleming.  Thermally-stimulated conductivity and luminescence in organic polymers , 1989 .

[3]  J. Dueñas,et al.  Dielectric relaxation study of low-density polyethylene by thermally stimulated depolarization currents and thermal sampling , 1989 .

[4]  K. Kudo,et al.  Thermally stimulated current studies on ethylene-propylene rubber with fillers , 1988, Proceedings., Second International Conference on Properties and Applications of Dielectric Materials.

[5]  K. Kudo,et al.  Thermally stimulated currents in ethylene-propylene rubber with fillers , 1987, Conference on Electrical Insulation & Dielectric Phenomena — Annual Report 1987.

[6]  M. Ieda,et al.  Carroer Injection, Space Charge and Electrical Breakdown in Insulating Polymers , 1987, IEEE Transactions on Electrical Insulation.

[7]  J. van Turnhout.  Thermally stimulated discharge of electrets , 1980 .

[8]  J. Gasiot,et al.  Field-induced thermally stimulated currents , 1979 .

[9]  C. Lacabanne,et al.  Depolarization thermocurrent of polyethylene containing additives , 1978 .

[10]  Takanori Tanaka,et al.  Thermal‐depolarization‐current study of composites of epoxy resin containing mica flakes , 1977 .

[11]  P. Röhl,et al.  Thermally stimulated and isothermal depolarization currents in low‐density polyethylene , 1976 .

[12]  J. Rabo.  Zeolite chemistry and catalysis , 1976 .

[13]  J. G. Simmons,et al.  High-Field Isothermal Currents and Thermally Stimulated Currents in Insulators Having Discrete Trapping Levels , 1972 .

[14]  H. Hendus,et al.  Schmelzpunkt und kristallitgröße von aus schmelze und lösung kristallisiertem polyäthylen , 1968 .

[15]  Lawrence E. Nielsen,et al.  Mechanical Properties of Polymers , 1962 .