الفهرس 
Chapter 1 General Introduction, Theoretical Consideration and Experimental TechniqueOnly 14 pages are availabe for public view
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Abstract
In this work, a design of an opto-thermo-mechanical testing machine is introduced. This machine is capable of performing automated fibre-testing procedures. Using this machine, various mechanical tests can be performed including twisting, bending, rotation and measurement of the instantaneous intrinsic stress during stretching and relaxation. A general introduction is given in chapter (1) with a review of the previous work dedicated to the investigation of polymeric fibres under different mechanical stretching techniques and its interrelation to the optical properties and structural changes. The design of the opto-thermo-mechanical stress testing device is presented in chapter (2). This device can be used to characterize fibres under many common types of thermal and mechanical treatments including stretching, relaxation and heating. The device is attachable to common optical and interferometric systems. In chapter (3), the designed mechanical testing device is used to measure the optical parameters and stress-strain data during stretching fibres at different stretching speeds. In chapter (4), the effect of relaxation processes, subsequent to mechanical stretching processes, on the optical and structure properties of isotactic polypropylene, iPP, monofilaments are investigated for different drawing speeds. In chapter (5), by attaching a heating element and a controller, the designed software allowed us to investigate the mechanical response of iPP fibres at different surrounding temperatures.