[Viscoelastic behaviour of inlay waxes. (Part 3) Dynamic viscoelastic properties of ternary and quaternary mixtures of waxes (author's transl)].

Abstract

The viscoelastic properties of ternary and quaternary mixtures added carnauba wax, dammar and beeswax to paraffin were investigated by measurement of dynamic viscoelasticity. The effects of the composition of waxes and the crystal transition temperature of paraffin to the viscoelastic behaviour of these waxes were discussed. The viscoelastic properties of ternary mixtures added carnauba wax and dammar to paraffin were similar to these of binary mixtures for paraffin and dammar in the region of lower temperatures, and similar to these of binary mixtures for paraffin and carnauba wax in the region of higher temperatures. In quaternary mixtures added carnauba wax, dammar and beeswax, tan delta was larger than that of ternary mixtures, so the effect of additions of dammar was disappeared in the region of lower temperatures. Additions of carnauba wax, like to the case of ternary mixtures, had an effect on the viscoelastic properties of quaternary mixtures, but the temperature dependence of G' and tan delta of these waxes were slightly broader than that of ternary mixtures in the region of higher temperature. For a same composition in ternary and quaternary mixtures, even if the paraffins with different transition temperature were used, the shapes of curves of G' and tan delta were so similar to one another that were approximately superposable.