Polyvinylalcohol (PVA) films, filled with mass fractions % of , were prepared. The x-ray diffraction spectra indicated the partial crystallinity of PVA, which decays as w increases. The infrared analysis implied that the degree of syndiotacticity depends, nonmonotonically, on w . The observed peak at 520 nm, in the ultraviolet-visible spectra, revealed (i) the transition . (ii) the octahedral coordination of , (iii) the trapped electrons of the OH group of PVA and (iv) the spin-cluster excitation. The dependence on the temperature T of the dc electrical conduction was attributed to phonon-assisted interpolaron one-dimensional (1D) hopping of charge carriers. The temperature dependence of the dc magnetic susceptibility fits the 1D Ising antiferromagnetic equation well. The obtained electron spin resonance spectra exhibit the main features of the spectrum of the unfilled PVA. The dependence on the filling level of the logarithm of the calculated average rotational correlation frequency of mobile spins was compared with the corresponding dependences of the Ising coupling factor and the degree of syndiotacticity. The spin configuration of the present system was discussed in detail; it differs from the spin configuration of the -filled PVA films. The 1% -filled PVA film is the most suitable for its response to electromagnetic waves.
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Tawansi et al. (1998) studied this question.