Solidification of Polypropylene Under Processing Conditions - Relevance of Cooling Rate, Pressure and Molecular Parameters

摘要: Polymer transformation processes are based on a detailed knowledge of material behaviour under extreme conditions that very far from the usual normally available in scientific literature. In industrial processing, for instance, materials subjected to high pressure, shear (and/or elongational) rates and thermal gradients. These lead often non-equilibrium conformational states, which turn out be hard describe using classical approaches. Moreover, it is easy understand analysis relationships between processing morphology developed crucial point characterisation plastic materials. If investigation semicrystalline polymer, becomes still more complex by crystallisation phenomena, need properly described quantified. Furthermore, lack significant information regarding influence crystallization kinetics restricts possibilities modelling simulating processes, indicating development model, capable describing polymer drastic solidification task.