Abstract
Poly(ethylene-co-vinyl acetate) (EVA) is a copolymer of utmost importance in nanocomposite applications. Clay dispersed in an EVA matrix was tested using different types of clays with hydrated silicate layers. Several observations have led to the unexpected physical point of view of (clay/polymer) interaction. Due to the polar nature of the acetate group, a strong interaction would be expected when using a polar group-bearing surfactant such as organophilic modified montmorillonite (OMMT – 30B). Through research using techniques that explore the rheology in the molten state, it was evident that a stronger interaction is possible for nonpolar group-modified organophilic clays. This strong interaction is the result of a complex environment of physical entanglements that show a pseudo-solid behavior among the nanoclay dispersed in the EVA matrix. In this chapter, we will emphasize the influence of processing and type of organic modifier in natural organophobic clay (Cloisite® Na+) dispersed in an EVA matrix. The characterization techniques will be discussed by the study of melt state rheology and thermal behavior of these materials. The relaxation phenomena and creep compliance behavior as well as a correlation between the processing and final properties are detailed for EVA and OMMT nanocomposites.
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