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Polyvinylidene fluoride and polymethylmethacrylate (PVDF/PMMA) films were blended with different concentrations by casting method. Structural, spectroscopic, and morphological characteristics of both the interface and the surface of the films have been investigated. The blends were characterized using X‐ray diffraction (XRD), Fourier transform infrared (FTIR), UV–visible, differential thermal analysis (DTA), and scanning electron microscopy (SEM). All measurements reveal that the blends take place based on the influence of PMMA content on PVDF. FTIR results indicate the possible interactions between carbonyl group of PMMA and CH2 groups of PVDF which indicates the formation of blends. Optical absorption spectra suggested the presence of an optical gap (Eg) which decreased with increasing PMMA content. UV/VIS spectra were characterized by a sharp edge and a window of wavelength range 290–350 nm for some blends. The optical window can be used as an optical sensor or band pass filter. The degree of crystallinity was found to decrease with increasing PMMA content, which was confirmed by XRD and DTA analysis. SEM micrograph shows spherulites which increase with the addition of PMMA and it becomes sharper and contains a longitudinal shape. POLYM. ENG. SCI., 2008. © 2008 Society of Plastics Engineers

a b s t r a c tIn this work, FT-IR, Raman, TEM spectroscopy and AC conductivity were used to study and characterize of PEO/PVDF blend incorporated with low content of multi-walled carbon nanotubes (MWCNTs). Main characteristics of IR and Raman bands for the two polymers and MWCNTs were observed. The shift of G, D and G 00 bands of MWCNTs occurred. All results showed that MWNTs-COOH were covalently linked with the blend through OH and C-C bonds. TEM images illustrated that MWNTs were well dispersed into polymeric matrices and wrapped with PEO/PVDF chains. The temperature dependent conductivity measurements of nanocomposites were studied. The addition of MWCNTs increases and enhances the conductivity attributed to charge carrier build up and increases in segmental mobility of polymeric chains. Molecules in the loaded samples begin to bridge the gap which separates them by lowering potential barriers and the localized state between them. Values of both e 0 and e 00 are high at lower frequency and decrease with an increase of frequencies due to polarization effects.