CHARACTERIZATION OF H3PO4 BASED PVA COMPLEX SYSTEM

In this communication, thin films of polyvinyl alcohol (PVA) complexed with H3PO4 of different stoichiometric ratios have been characterized using various experimental techniques, namely IR, NMR and X-Ray Diffr action. Comparing the characteristic behaviour of pure and complexed P VA, it is observed that there is appearance of a new spectral band (IR ), some new atomic planes in addition to variation in relative intensi ty (X-ray diffraction) and change in chemical shift along with change in intensity (NMR) which ail confirm the formation of PVA-H3PO4 comple xes. It is found that the amorphous character of PVA complexes increas es with H3PO4 concentration which governs the magnitude of conductivit y of polymer complexes. The ionic transference number of mobile ions h as been estimated by Wagner's polarization method and the Value is rep orted to be t(ion) = 0.97. The Transient Ionic Current (TIC) measureme nt technique has been used to detect the type of mobile species and to evaluate their mobilities. The mobility of H+ cation has been calcula ted and found to be mu(H+) similar or equal to 1.3 x 10(-4) cm(2) V-1 s(-1).