South African Journal of Science
versão On-line ISSN 1996-7489
versão impressa ISSN 0038-2353
MALLICK, Kaushik et al. Palladium-polyaniline type composite polymers: using catalysis as a monitor of palladium location. S. Afr. j. sci. [online]. 2008, vol.104, n.11-12, pp.496-498. ISSN 1996-7489.
The location of nanosized (2-4 nm) palladium particles in two palladium-polyaniline-based composites, synthesized by the redox coupling route using monomer and palladium(II) acetate, have been revealed using ethene hydrogenation as a heterogeneously catalysed reaction, together with differential scanning calorimetry. The two palladium composites were synthesized using m-aminobenzoic acid (ABA) or o-phenylenediamine (PDA), leading to Pd-PABA or Pd-PPDA, respectively. The temperature sensitivity of catalytic activity related to the polymer melting temperature, as revealed by DSC, assists in understanding the location of the palladium particles. The structures of the metal-polymer composite at the micrometre and nanometre levels are revealed using scanning and transmission electron microscopy, respectively.