Premium
Effect of doping polyacrylic acid with some dopants as studied by different techniques
Author(s) -
Mostafa N.,
Mohamed Manal G.
Publication year - 2002
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.10381
Subject(s) - polyacrylic acid , dopant , doping , analytical chemistry (journal) , materials science , polymer , nuclear chemistry , conductivity , polymer chemistry , chemistry , organic chemistry , composite material , optoelectronics
Abstract The molecular weight of polyacrylic acid (PAA) was determined by a viscometric method using NaNO 3 as solvent at 30°C. The specific electric conductivities (σ) of PAA as well as PAA doped with carbon black (CB), chromium oxide (Cr 2 O 3 ), and cupferron with different concentrations (from 0.25 to 1 wt %) were measured at a temperature range 360–400 K. IR spectra of some polymers were determined and it was shown that when PAA was doped with 0.5 wt % CB, a COC band appeared at 775–875 cm −1 . The positron annihilation lifetime (PAL) spectra in PAA doped with the above‐mentioned dopants were measured as a function of their concentrations. It was observed that the short lifetime intensity I 1 decreased, whereas the intermediate lifetime intensity I 2 , which is related to the conductivity of the material, increased with increasing the wt % of Cr 2 O 3 and cupferron as well as at low concentrations of CB. These results are discussed in terms of the conducting island model. It was found that there were distinct positive relationships between σ and I 2 . © 2002 John Wiley & Sons, Inc. J Appl Polym Sci 84: 877–883, 2002; DOI 10.1002/app.10381