MEASUREMENT OF THERMOPHYSICAL PROPERTIES OF POLYVINYL-ALCOHOL COMPLEXED WITH SOME METAL-IONS

Polyvinyl alcohol (PVA)-Cu(II) and PVA-Cr(III) complexes were prepared with different concentrations of CuCl2 and Cr(NO3)3 salts. The struct ures of the obtained complexes were investigated using UV spectroscopy and x-ray analysis. The thermal properties (volumetric heat capacity, thermal diffusivity, and thermal conductivity) of aqueous solutions o f PVA-metal complexes have been measured using the hot-wire (and strip ) technique as a function of temperature (20-degrees-80-degrees-C). Th e results show that the values of the thermal properties depend on the type and the concentration of metal ions bound to the polymeric chain s of PVA and the temperatures. However, a considerable increase in the values of the thermal properties was observed for PVA-Cu(II) complex. The type of metal salt under investigation affects the structure of P VA. The complex of PVA-Cr(III) is more thermally stable than the compl ex of PVA with Cu(II). However, both polymer-metal complexes showed go od properties which may make them acceptable for some practical uses.