Distribution of neutral solitons in t-polyacetylene: crystalline and amorphous regions

Several parameters of magnetic resonances are studied to obtain the distribution of the neutral solitons on mechanically stretch-oriented t-polyacetylene prepared by Narrmann-Theophilou type technique. Degree of orientation characterized by the second moment of proton NMR is compared with the ESR linewidth, spin-lattice relaxation rate and NMR spin-lattice relaxation rate. The result suggests several times higher concentration of the neutral solitons in the amorphous region. T1H−1 of proton NMR suggests a small but finite existence of relaxation path to fixed paramagnetic spins through spectral diffusion.