Thermal, structural, optical and electrical properties of PVA/MAA:EA polymer blendfilled with different concentrations of Lithium Perchlorate

• Main Authors: Siddaiah, T., Ojha, P., Gopal, N.O., Ramu, Ch., Nagabhushana, H.
• Format: Article
• Language: English
• Published: Elsevier 2019
• Subjects: Polymer; Lithium Perchlorate; PVA/MAA:EA blend; FTIR; TGA; X-ray; SEM and optical energy
• Online Access: http://repository.vnu.edu.vn/handle/VNU_123/64734; https://doi.org/10.1016/j.jsamd.2018.11.004
• Institution: Vietnam National University, Hanoi

Structural, optical, thermal and morphological studies were performed on pure Polyvinyl alcohol/ Methacrylic AcideEthyl Acrylate (PVA/MAA:EA (50:50)) blend and PVA/MAA:EA blendfilled with different concentrations (5, 10 and 15 wt%) of Lithium Perchlorate (PVA/MAA:EA: LiClO4) prepared by a solution casting method. XRD patterns demonstrated that the peak intensity at 2q¼19.5 decreased and the bandwidth increased with increasing the concentration of LiClO4, which implied a decrease in the degree of crystallinity and hence caused an increase in the amorphous nature. UVeVisible analysis revealed that the values of both direct and indirect band gaps were decreased with increasing LiClO4 content in the polymer host. This indicated the formation of charge transfer complexes between the polymer blend and thefiller. The dTGA curves show three different steps of weight loss. This is due to the loss of water adsorbed, the elimination of the side chains, and the decomposition of the main chain. For LiClO4filled PVA/MAA:EA, FTIR spectra showed disappearance of some bands with the change in their intensities as compared to pure PVA/MAA:EA film. This indicated considerable interaction between the polymer blend and LiClO4filler. SEM images of the polymer blendfilms complexed with LiClO4suggested the presence of a structural rearrangement of the polymer chains. The electrical conductivity of the preparedfilms was measured using the impedance analyzer in the frequency range from 1 Hz to 5 MHz at room temperature. It was observed that the conductivity increased with increase of the Liþion concentration