Introduction The study of composite materials, i.e., mixtures consisting of at least two phases of different chemical compositions, has been of great interest fro m both fundamental and practical standpoints. The macroscopic physical p roperties of such materials can be co mbined so as to produce materials with a desired average response. [1]. The properties of poly me r-mineral reinforced composites are determined by the co mponent properties (particle shape, surface area, surface chemistry, poly mer microstructure) and by the preparation method and processing conditions as well. A mong of preparation methods, injection mo lding has strong influence on the internal microstructure of polymers and in a consequence on mechanical response of the material [2]. Doping of poly mers attracted the scientific and technological researchers , because of their wide applications. The dopants in polymer can change the molecular structure and hence the microstructure as well as the macroscopic properties of the polymer [3]. Po lyvinyl alcohol (PVA), which is essentially made fro m polyvinyl acetate through hydrolysis, is easily degradable by bio logical organis ms and in water is a solubilized crystalline structure polymer [4]. PVA is formed by the polymerizat ion of vinyl acetate, which is then hydrolyzed into PVA. Fig. 1 shows the chemical structure of PVA. The excellent chemical resistance and physical p roperties of PVA resins have led to broad industrial use [5]. PVA is a low cost hydrophilic poly mer and therefore swells in the presence of water or bio logical flu ids to form hydrogels. This property is particularly useful because it can allow for the release of drugs incorporated into these hydrogels. Since PVA has a high selectivity of water to alcohols, it exhibits low methanol permeab ility and has been used in some alkaline fuel cell [6-7]. PVA is an artificial polymer that has been used during the first half of the century worldwide. It has been applied in the industrial, co mmercial, med ical, and food sectors and has been used to produce many end products, such as lacquers, resins, surgical threads, and food packaging materials that are often in contact with food [8]
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