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Articles by Nizar Jawad Hadi
Total Records ( 2 ) for Nizar Jawad Hadi
  Jaleel Kareem Ahmed , Nizar Jawad Hadi and Salah Mahdi Abdullah
  Composite films of Poly (Methyl Methacrylate) (PMMA)/SiO2-ZnO-Ch are prepared by casting method and evaluated for medical application. Nano silica was prepared from water glass by precipitation method, chlorophyll (Bio natural pigment) extraction from medicago sativa and use as plasticizer. In this study, nano silica and nano zinc oxide are used as filler to improve the biological and mechanical properties of composite films. Where nano silica has good mechanical properties and nano zinc oxide has excellent antibacterial activity (SiO2-ZnO and Ch) are used with a following percentages (1-3) wt.% to the polymer. Many tests are carried on composite films such as antibacterial activity, Fourier Transform Infrared spectroscopy (FTIR) and tensile test. The result shown that zinc oxide has excellent antibacterial activity. And its activity in composite films increasing with increasing its concentration.
  Nizar Jawad Hadi , Najim A. Saad and Dhey Jawad Mohamed
  This study investigated the morphological and rheological properties of Calcium Carbonate (CaCO3) nanoparticles reinforce virgin Polypropylene (PP) and its waste. PP and CaCO3 nanoparticles in the content of (3, 5, 7 and 10 wt.%) were mixed by melt extrusion in a twin screw extruder at different screw speeds 25 and 50 rpm at 190°C. Different microstructure and morphological techniques (X-ray diffraction and field emission scanning electron microscopy) were used to evaluate the effect of the additive percentage (CaCO3) and the processing condition (screw speed) on the microstructure of the nanocomposite. The rheological behavior (Melt Flow Rate (MFR) and Melt Volume Rate (MVR)) is tested using Melt Flow Index (MFI) device. MFR of the new modified composite are tested due to the nanoparticles concentration, loads, temperatures and rotating speed while MVR was tested at different CaCO3 nanoparticles percentage at 2.16 kg. Shear rate and viscosity are predicted according to the MFR values. The results shows that the crystallinity was increasing with the CaCO3 nanoparticles percentage increasing while the results of FESEM show that CaCO3 nanoparticles distribution in PP matrix at 25 rpm is more homogenous and less agglomeration than at 50 rpm. The value of MFR and MVR were increasing for virgin PP while decreasing for waste PP. at 25 and 50 rpm.
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