الفهرس 
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Abstract
Samples of virgin Polyvinyl Chloride (PVC), Polyvinyldin Fluoride (PVDF) in combination with their blend PVDF/PVC (30/70)wt% and other samples that doped with minor concentration up to (0.15%) of Multi Wall Carbon Nano Tubes (MWCNTs) were successfully synthesized using tetrahydrofuran (THF) as a common solvents based on previous studies to be used as sensors for different variations in environmental and industrial applications. Transmission electron microscope (TEM) was used to investigate structural changes of the nano-metric scale dopant material and to study their dimension and geometry variation after introducing the surface function group. FTIR optical absorption spectroscopy was employed to investigate chemical and/or physical interaction that might occur during doping with Multiwall Carbon Nanotubes or to detect the present functional group caused by presence of polymeric matrices. It is clear from intensity change a presence of some type of interaction attributed to the interaction between hydrogen bonding in PVC with CF2 groups in PVDF. Multiple spectroscopic techniques were also used to investigate the effect of adding MWCNTs in the doping level to the polymer blend. X-ray diffraction pattern (XRD) show the presence of the PVDF crystalline phases including and phases that noticed to be affected by increasing content of MWCNTs. Crystalline phase percent was calculated for different samples and found to be increase with increasing doping percent, an empirical equation was adopted to illustrate these effects. UV-Visible optical measurements was employed to calculate the optical energy gap using different assumption and models including Tauc’s and Davis tacking into account different transition routes (Direct allowed, direct forbidden, indirect allowed and indirect forbidden). All results indicate a change in optical energy gap combined with increasing MWCNTs content in the polymeric matrix and indirect allowed transition is the most probable transition and seems to be the dominant factor in electrical conductivity and activation energy. Homogeneity of the sample surface even with increasing content was approved using SEM images. Synthesized samples recommended to be partner in pressure and humidity sensors.