5574
Asmaa Mohamed Ismail Mohamed
Spectroscopic Study and Structural Characterization of PEO/PVDF Blend Doped With Inorganic Nanoparticles
PEO/PVDF, Li4Ti5O12 NPs, XRD, HRSEM, TGA,AC conductivity
The present thesis deals with the preparation of blends of Poly (ethylene oxide) (PEO) and poly (vinylidene fluoride) (PVDF) films of compositions (50/50, 40/60, 30/70 and 20/80 wt/wt %) by casting technique. XRD, DSC and FT-IR were studied for all samples. (20/80 wt/wt %) PEO/PVDF blend provides the proper blending of these polymers. (20/80 wt/wt %) PEO/PVDF blend doped with concentrations 0.5, 0.7, 1.0, 2.0, 5.0 and 7.0 wt% Li4Ti5O12 NPs were prepared using casting technique. Structural, optical and thermal properties of polymer nanocomposites are investigated by using XRD, HRSEM, EDS, FT-IR, UV-Vis, DSC and TGA. Also, dielectric properties were studied. XRD, FT-IR and DSC data show that there is an interaction between the blend sample and Li4Ti5O12 NPs. Also, the addition of Li4Ti5O12 NPs decreases the degree of crystallinity of the blend sample. From TG data and the calculated activation energies revealed that the thermal stability of (20/80 wt/wt %) PEO/PVDF improves by addition of Li4Ti5O12 NPs. HRSEM images reveal that the presence of Li4Ti5O12 NPs leads to changes in the surface morphology of the nanocomposites and gives rise to crystalline domains up to 5wt% Li4Ti5O12 NPs, then deteriorations is occurred. The addition of Li4Ti5O12 NPs to the (PEO/PVDF) enhances the electrical conductivity of the blend attributed to charge carrier build up and increases in segmental mobility of polymeric chains.
2019
Ph.d
Cairo
Science