Effect of crystallization time on the properties of PPVA-AlPO 4 nanocomposite synthesis by hydrothermal method at various pH

The hydrothermal method is now widely used in the synthesis of nanomaterials because it is simple, easy and inexpensive to produce. The transformation of nanomaterials into a crystalline structure can be easily modified at different temperatures, pressures and heating modes (conduction, convection or microwaves). This study investigates the effects of pH and crystallization time on the evolution of the microstructure of phosphorylated poly(vinyl alcohol)-aluminum phosphate (PPVA-AlPO4) nanocomposite. The thermal stability, structure and surface morphology were recorded using TGA, FTIR, XRD and FESEM analyses. The microstructure evolves into spherical nanoparticles at low pH and nanowires at highly alkaline conditions. The particle size of the observed nanocomposite decreased with increasing crystallization time. At a crystallization time of two hours, the structure was found to have no OH peak in the water region and the intensity of the C-O-P and O-P-O-Al peaks increased. As a conclusion to produce high crystallinity and uniform distribution of PPVA-AlPO4 nanocomposite nanoparticles, a reaction at a pH of 10 and a crystallization time of 2 hours is suggested.