Bm. Aboelkhair et al., MEASUREMENT OF THERMOPHYSICAL PROPERTIES OF POLYVINYL-ALCOHOL COMPLEXED WITH SOME METAL-IONS, Journal of macromolecular science. Physics, B33(3-4), 1994, pp. 387-395
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.