Abstract
The polymerization of aniline (AN) was assisted with an oligomer that possessed two amino end groups (2AO) in the presence of a single enantiomeric acid, (1S)-(+)-10-camphorsulfonic acid ((S)CSA). The reaction produced helical polyaniline (PANI) nanofibers with the opposite helical sense due to the concentration changes of (S)CSA in the polymerization system. The similar dependence of the circular dichroism (CD) signal on the (S)CSA concentration was also observed in the oxidization of the oligomer 2AO by ammonium persulfate (APS) in the presence of (S)CSA. In addition, under a certain (S)CSA concentration, the 2AO-assisted polymerization at low and high temperatures also produced the PANI fibers with the opposite helical sense. It is likely that these result from the different interaction modes of (S)CSA with the 2AO at different (S)CSA concentration. As a consequence, the oxidized 2AO (oligomer seeds) with different chirality in the early stage of the polymerization control the helicity of the resulting PANI nanofibers.
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