Thermomechanical Correlations and Morphological Evolution in PVA/LiClO 4 Composite Membranes

The primary objective of this paper is to comprehend the interrelations among the morphological, thermal, and mechanical properties of composite polymeric membranes composed of polyvinyl alcohol combined with lithium perchlorate salt, (PVA‐X wt% LiClO 4 ) where X = 0%, 1%, 5%, and 10%. The composites were prepared using the solvent evaporation method. Morphology and map sum spectrum were visualized by a coupled SEM–EDS system, the technique identified the PVA′s smooth surface while spherulite particles and chlorine atoms from the ClO 4− ions are presented in higher salt concentrations. From differential scanning calorimetry and thermogravimetry studies, the PVA‐5% LiClO 4 system exhibited the maximum glass transition temperature (T g = 84.2 ° C), decomposition temperature (T D = 298.7 ° C), and crystallinity degree of 14.1%. Dynamical mechanical analysis showed high storage capacity on the order of 400 MPa, whereas strain–stress analysis revealed elastic and plastic behaviors, with samples sustaining stresses between 10 and 20 MPa and strains ranging from 300% to 350%. Therefore, these properties are studied for potential applications of these composite polymeric membranes.