NAGWA A. KAMEL*, SALWA L. ABD-EL-MESSIEH*, SAMIA H. MANSOUR**, BERLENTY A. ISKANDER***, WAFAA A. KHALIL****, K.N. ABD-EL-NOUR
*Microwave Physics and Dielectrics Department, National Research Centre, Dokki, Cairo, Egypt
**Polymers and Pigments Department, National Research Centre, Dokki, Cairo, Egypt
***Engineering Department, American University, Cairo, Egypt
****Biophysics Department, Faculty of Science, Cairo University, Egypt
Polypropylene fumarate (PPF) as unsaturated polyester was prepared to be crosslinked with three different monomers namely N-vinyl pyrrolidone (NVP), methyl methacrylate (MMA) and a mixture of NVP and MMA (1:1 weight ratio) and were filled with different concentrations of hydroxyapatite (HA) 40, 45 and 50 wt%. The bone apatite which is expected to be formed on the surface of the samples after immersion in simulated body fluid (SBF) has been studied through different tools. Fourier transform infrared (FTIR) used for characterizing the composites through the band assignments of different groups. The results of scanning electron microscope (SEM) and energy dispersive X-ray (EDX) confirmed the layer formed on the surface through the SEM images and phosphocalcic ratios. The dielectric relaxation mechanisms which were studied at frequency range from 102 to 105 Hz through Fröhlich and Havriliak-Negami functions is considered to be a good support to the formation of such layer on the surface of the composite. The degradation rate and degradation mechanism are also taken into consideration.
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