الفهرس 
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Abstract
The present work, aims to preparation and
characterization of nanocomposites from some polymeric
materials based on layered double hydroxides of different
cations ratios and their applications as nano structured materials
to be used as packaging materials. This study consists of three
parts.
The first part includes a general introduction, in which
the preparation methods of Polystyrene and poly (methyl
methacrylate) are given. Also the properties and application of
those polymers were included. Furthermore, the classification
of different composites, the definition of the nanocomposites,
their types and properties were extensively mentioned. Some
application and structures of Nanocomposites, layered double
hydroxide and polymer layered double hydroxide
nanocomposites were of great value to be mentioned.
Moreover, those nanocomposites were characterized by fourier
Summary
131
transform infrared (FTIR) Analysis, X-ray diffraction (XRD),
scanning electron microscope (SEM), transmission electron
microscope (TEM), thermogravimetric analysis (TGA), and
differential scanning calorimetery (DSC).
The second part includes the experiments which
concerned with the preparation of layered double hydroxides of
different Zn/Al ratios (from 2:1, 3:1 to 4:1) and it was extended
to include their characterization. Additionally, this part
discussed the incorporation of layered double hydroxides into
Polystyrene and poly (methyl methacrylate) by in situ
polymerization using sodium dodecyl sulphate (SDS) as a
surfactant and ammonium persulphate (APS) as an initiator.
The third part includes the methods of characterization of
the prepared nanocomposites. Evaluation of the prepared
nanocomposites as packaging materials was done by
investigation of the dynamic mechanical properties of the
prepared nanocomposites films. It was done by an Anton Paar
MCR301 Rheometer with CTD600 convection oven. Finally,