A study of nano-mechanical and macro-mechanical properties of ethylene vinyl acetate

Nano- and macro-mechanical properties of ethylene vinyl acetate (EVA) with various amounts of vinyl acetate (VA) have been investigated. Nano-mechanical properties (modulus and hardness) were obtained using nano-indentation measurements while macromechanical properties were determined using tensile test measurements. A decrease in Young's modulus and hardness was observed with increasing VIA content for both nano- and macro-mechanical measurements. An increase in Young's modulus and hardness was observed as a function of the draw ratio keeping the VA content constant. The difference between macro and nano-mechanical properties as a function of VIA content and draw ratio is explained in terms of crystallinity and chain orientation. POLYM. ENG. SCI., 48:277282, 2008. (c) 2007 Society of Plastics Engineers.