Study on Flow Induced Nano Structures in iPP with Different Molecular Weight and Resulting Strength Behavior

Polypropylene samples in a wide molecular weight range between approx. 100 kg/mol to 1600 kg/mol were processed by injection molding to thin walled micro specimens with respect to study shear induced crystallization phenomena under high shear rate and subsequently possible self reinforcement effects. The specimens nano structures were investigated and related deformation behavior under tensile studied. Novel morphologies have been detect and their micromechanical mechanism interpret and summarized.