Influence of titanium chloride addition on the optical and dielectric properties of PVA films
Ghannam, M. Abdelaziz and Magdy M. . 2010
Polymeric films based on polyvinyl alcohol (PVA) doped with titanium chloride (TiCl3) at different
weight percent ratios were prepared using the solvent cast technique. The structural properties of these
polymeric films are examined by XRD and FTIR studies. The complexation of the dopant with the
polymer was confirmed by FTIR studies. The XRD pattern reveals that the amorphous domains of PVA
polymer matrix increased with raising the TiCl3 content. The optical properties of these polymeric films
were examined by optical absorption and emission spectroscopy. Electrical conductivity was measured
at room temperature of pure PVA and PVA doped with different concentrations of TiCl3 from 20 Hz to
3 MHz. The conductivity was found to increase with the increase in dopant concentration. The dielectric
constant (e0) indicates a strong dielectric dispersion in the studied frequency range and increases as
dopant content increases. This increase in both s and e0 is attributed to the increase in the localized
charges distribution. Moreover, a loss peak was identified in the dielectric loss spectra and it is
attributed to the orientation of polar groups.
The in vitro release studies showed an initial rapid 5-FUrelease followed by a sustained release profile. The in vitro cytotoxicity of C-5-FU PLGA NPs showedsignificant inhibition of colon cancer…
Abstract: Due to widespread of human exposure to electromagnetic fields, there has been increasing public concern
about the potential health risks from low-frequency electromagnetic fields;…
Polymeric films based on polyvinyl alcohol (PVA) doped with titanium chloride (TiCl3) at different
weight percent ratios were prepared using the solvent cast technique. The structural…