الفهرس 
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Abstract
The rigorous development of polymer science and the extensive
Utilization of polymeric materials in technology has led in recent years to an increased interest in the various problems of the physics of polymers. This is evident from the fact that not only physicists but also synthetical chemists , technologists and structural engineers have became more and more interested in numerous problems of the physics of polymers.
Investigation of the electrical properties of polymers constitutes one of the most convenient and sensitive methods of studying polymer structure. Accordingly, factors which have appreciable effect on the polymer structure must be carefully studied. In particular, polymerization, copolymerization and terpolymerization.
There is an increasing interest in the use of gamma radiation in the range of (1to 1000 k.rad) for insect control, seed and vegitable sprouting inhibition, vegetable and fruit shelf life extension, radio therapy, initiation , vegetable and fruit shelf life extension , radio therapy , initiation of polymerization and graft polymerization of certain monomers and prepolymers. Therefore, there is a need for a dosimeter that can measure simply, directly and reproducibly doses between 1 and 1000 k. rad.
The major polymer used throughout this thesis is poly methy1 methacrylate (pmma) in view of its wide applications in plastic industry.
The mms was mixed separately with acrylic acid (AA), fe-acrylat, mn-acrylate and fe-acrylate mixed with mn-acrylate monomers.all samples were mied in different weight ratios in soda glass tubes (1.853cm diameter and 30cm length) containing 2.688x10-3g.mo1/l benzoy1 peroxide. The tubes were flushed with pure nitrogen gas then sealed. The sealed tudes were put in an automatically controlled water bath at 600c for several days . finally hard transparent yellowish, reddish brown, deep brown and deep brown plastic samples were obtained respectively, then cut into discs of 0.2cm thickness and polished.