الفهرس 
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Abstract
Polymers are natural or man-made molecules,frequently called macromolecules they are composed of smaller units monomers which have reacted together to give a long chain,rather like a striing of beads.in the simplest polymers,the monomers are identical and the polymer is named by prefixing poly, to the name of the monomer from which it is derived.thus the polymer from ethylene is poly(ethylene)although in the common use the brackets are omitted.the field of polymers is so vast and the applications so varied,that it is important to understand how polymers are made and used.since there are over 60,000 different plastics varying for a place in our life(1-5).