Abstract
The structure of ethylene-vinyl-acetate (EVA) copolymers depends strongly on the comp9sition of E (ethylene) and VA (vinyl-acetate). With various compositions in VA:E ratio in weight, the results show that both the density and the melt index increase, while the molecular weight, the melt viscosity and the degree of crystallinity decrease with increasing VA:E ratio in EVA copolymers. This reflects that both the ethylene sequence length and the activation energy of fluidity decrease with increasing VA content. The change of the structure of EVA copolymers is directly correlated with the change of the mechanical and dielectric properties of this material. The peak values of the dielectric constant and the dielectric loss in the dielectric relaxation temperature characteristics increase, while the activation energy of polarization and the dielectric breakdown strength decrease with increasing VA:E ratio. Other mechanical properties, such as the tensile strength and the environment stress cracking, also correspondingly decrease as the molecular weight and the ethylene sequence length decrease due to the increase of VA content in EVA copolymers.
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