Abstract
A novel dynamic microcellular foaming technology is presented in the form of mechanical vibration, forming an oscillatory shear orthogonal superposition upon steady shear flow. The effects of steady and oscillatory shear on polystyrene foam processing were investigated with a novel dynamic foam processing simulator. Cell morphology was analyzed by using a scanning electron microscope (SEM). The results show that the oscillatory shear has a significant influence on the cell morphology. A fine cell structure with nearly spherical cell shape is nucleated with properly arranged rotor speed and vibration parameters. At the same time, cell density increases remarkably with the introduction of vibration.
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