The Viscoelastic Behavior of the Melts for Polyethylene Based Montmorillonite Exfoliated Nanocomposites
会议名称：《The 4th Pacific Rim Conference on Rheology》
会议日期：2005年
学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学]
关 键 词：polyethylene montmorillonite nanocomposites exfoliation viscoelasticity.
摘 要：正 The viscoelastic properties of melts for nanocomposites with exfoliated structures, composed of low-density polyethylene （LDPE）, ethylene vinyl acetate copolymer （EVA） and montmorillonite modified by using cetyltrimethylammonium bromide and octadecyltrimethylammonium bromide were studied. The results obtained through an examination of the dynamic storage module G’, dynamic loss module G and transient stress relaxation module G（t） of the composites revealed that the viscoelastic properties of composites strongly depended on the amount of montmorillonite exfoliated into the composites. With the increasing of montmorillonite content, the composites showed significantly a trend of pseudo-solidlike within the region of lower frequency （ω）. The montmorillonite layers could be aligned along the stress direction, and as a result, the dependence of dynamic modules on ωfor the composites appeared quite different before and after they were exposed to large amplitude oscillatory shear.