Elaboration, Thermal and Structural Approach of Manganese Phosphate Glasses Inside the System of K2O-MnO2-P2O5

Glasses of the composition (50-x/2) K2O-xMnO(2)-(50-x/2) P2O5 with (0 <= x <= 30%mol), have been prepared by standard melt quenching procedures. The amorphous state of the glasses is evidenced using the X-Ray diffraction. Their physical properties were characterized by thermal analysis and density measurements. The density and the glass transition temperature increase with increasing in MnO2 content. To study the structural role of MnO2 oxide in studied glasses, the FTIR and Raman spectroscopies have been employed. It was highlighted that the presence of MnO2 allows the depolymerisation of the phosphate chains and formation of covalent bonds P-O-Mn, which replace P-O-P and P=O linkages

Impact of peanut shells, olive pomace, and plaster on the dielectric properties of PA6

Polyamide 6 (PA6) is among the most widely used technical polymers due to its excellent balance between performance and cost. The diversity of its applications reflects its main qualities (good mechanical properties, thermal stability, resistance to many solvents and bases, etc.). PA6 is often used as an electrical insulator, and in this study, we have shown that we can keep this property by using Plaster (PL) as reinforcement, just as we can by incorporating bio-reinforcements including peanut shell powder (PSP) or olive pomace powder (OPP) to modify this behavior. This was achieved by studying the electrical and dielectric properties of PA6 and PA6/PSP, PA6/OPP, and PA6/PL composites using impedance spectroscopy in the glass transition region ranging from 20°C to 50°C in a range frequency 1Hz - 1MHz. The results show that the PA6/PSP and PA6/OPP composites exhibited low resistance; therefore, very good electrical conductivity was recorded. However, PA6/PL inherits almost the same characteristics as PA6. The present study asserts that the presence of charges in the composite's interfacial region greatly influences the electrical and dielectric behavior and that this behavior is strongly affected near the Tg