الفهرس 
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Abstract
Biomedical applications of polymers have attracted attentions during last decades.
Natural polymers kept the main role in this hot issue. Poly vinyl chloride (PVC) has presented as key polymer among other biopolymers for different biomedical applications such as blood bags. This thesis presents a new chemical route to improve the blood compatibility of PVC for blood bags application. This new route has overcome the drawbacks of other used methods published in the literature to achieve this goal, three steps have followed. The first step concurring on amination of PVC using ethylene diamine (EDA) to introduce amine groups to its structure. Then the aminated PVC was reacted with glutaraldehyde (GA) as activation step. The last step acting on grafting of activated PVC with chatoyant to produce surface modified PVC membranes with extra amine groups. Factors controlling the modification process have been investigated and thier impact on the modified PVC membranes characters has been monitored.