Abstract
Polyacrylic acid (PAA) doped with carbon black (CB), chromium oxide (Cr 2O 3) and cupferron with different wt% (0.25%, 0.50%, 0.75%, and 1%) was studied using positron annihilation lifetime (PAL) technique and Doppler broadening of annihilation radiation (DBAR). Ortho-positronium lifetime components ( τ 3 and I 3) were used to estimate the nanoscale free-volume hole sizes ( V f) and its fractions ( f). It was found that the hole size V f and its fractions f as well as S-parameters decreased at high value of doping concentration due to dopants-polymer formation. These results are supported by a significant narrowing in the nanoscale free-volume hole size distributions. The correlation between positron annihilation parameters and electric conductivity are discussed.
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