15N labelled polyaniline (PANI) is heat treated at several different temperatures from 200 to 1000 �C in a nitrogen atmosphere. The carbonization process of PANI is determined by using solid state(SS) 13C and 15N NMR method. Further, in an attempt to accurate assignment of experimentally observed 15N NMR chemical shift, theoretical nitrogen shielding is calculated employing ab initio MO calculations. . The SS NMR results imply that the reconstruction of polymer backbone occurs in the temperature range of 400 to 600 �C and the nitrogen of Phe-NH-Phe amino group change to the pyrrolic or tertiary nitrogen and the imine nitrogen change to pyridinic nitrogen. Further the heat-treatment above 700 �C leads to that the amount of five-membered ring containing nitrogen atom (pyrrolic) decreases and that of six-membered ring containing nitrogen atom (pyridinic, pyridine-oxide and pridinium) increases. 

Solid state NMR study of carbonization process of polyaniline

245th National Meeting (2013)

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