الفهرس 
General characterization of polymersOnly 14 pages are availabe for public view
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Abstract
Bisphenol A polycarbonate (poly-4,4’-diphenyl 2,2-propane carbonate) is one of the most recent development product in polymer industry. The importance of this polycarbonate material lies essentially in the favourable combination of superior technical properties such as rigidity, toughness, transparency, heat-resistance and self-extinguishing as well as good electrical insulating characteristics. Like other solids, its mechanical resistance depends largely upon its ability to resist molecular transformations under the effect of mechanical loads. The research described in this thesis is concerned essentially with the development of a new experimental and analytical technique to define some constants characteristic to this transformation which usually occurs just before material failure. Fracture analysis of amorphous polymer materials can be used as a quantitative tool to determine not only the size of fracture-initiating flaw but also the stress and the critical fracture toughness of the material. The techniques for standarizing these fracture measurements and the influence of factors such as microstructure, intrinsic and extrinsic stresses, loading rate, and local plastic deformation are descri bed.