Influence of Rare Earth Ion Lanthanum on Physical Properties of Biodegradable Polymer Blend PVA/PVP
Keywords:
Polymer blend, XRD, UV-vis absorption spectroscopy, Dielectric properties, NanoindentationAbstract
A biodegradable solid polymer blend films of PVA (50) /PVP (50) filled with La (NO3)3 were prepared by solution casting technique. The samples were subjected to Structural, Optical, Mechanical and Electrical investigations. The degree of amorphosity of the polymer blend composites was increased by the incorporation of filler into the polymer blend matrix which is shown by XRD. Decrease in the optical energy gap values was observed with the addition of filler which is illustrated by UV-vis studies, indicating the interaction of filler with polymer blend matrix.Temperature dependent broad band dielectric spectroscopic investigations have been carried out on all prepared samples in the frequency band 100 Hz to 1MHz. AC conductivity has been increased with increase in frequency which confirmed the possibility of higher concentration of charge carriers as well as their higher mobility. Dielectric behaviour was investigated using dielectric permittivity and dielectric loss tangent. With the temperature increase, value of dielectric constant was found to increase depicting the more polar nature of polymer matrix.The tangent loss spectra of the samples showed a broad peak which confirms the presence of relaxing dipoles in the polymer composites. Mechanical properties of the samples have been analysed employing nanoindentationtechnique which reveals the role of filler content in improving the elastic modulus and hardness of the samples.
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