A novel method for the shape‐controlled synthesis of uniformly‐shaped poly( p ‐phenylenediamine) (P p PD) microparticles with different morphologies under ambient condition has been developed using HAuCl 4 as an oxidant and poly( N ‐vinylpyrrolidone) (PVP) as a surfactant. The results demonstrate that the morphologies of these microparticles can be varied from symmetrical spindle‐like to diamond‐like, centrosymmetric leaf‐like, and parallelogram‐like by tuning the concentration of reactants and their molar ratios. The length of these microparticles varies from 6 to 8 µm while the width can be tuned from 2 to 4 µm. The results demonstrate that PVP as a surfactant only plays a role in controlling the morphology of the polymer particles but has no influence on the polymer structures. UV‐Vis absorption spectroscopy shows the formation of a complex between polymer ligands and lead ions by detection of new absorption peaks. Even though the as‐prepared P p PD microparticles are only partly soluble, they still show an adsorptive affinity for lead ions.
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Wang et al. (2008) studied this question.
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