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Positron lifetime measurements were carried out for polymer blends between polyethylene and ethylene vinyl acetate copolymer (E/VA) over the entire concentration range. The intensity I₃ of the longest-lived component due to the annihilation of ortho-positronium (o-Ps) exhibited a complex behavior as a function of E/VA concentration. The addition of up to 12% E/VA to polyethylene decreased the intensity from 28.2 to 25.8 %. Further addition of E/VA, somewhat surprisingly, resulted in an enhancement of positronium (Ps) formation that continued until I₃ reached a value of 29.7% for pure E/VA. The effect of E/VA on Ps formation was found to be strongly influenced by the application of an external electric field. For example, the o-Ps intensity recorded at a field of 50 kV/cm monotonously increased from 18.8% to 29.6% with increasing E/VA concentration. These results are discussed on the basis of the spur reaction model of Ps formation.
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Kobayashi et al. (1998) studied this question.
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