Abstract
Microcellular plastics are a unique cellular material in which voids, smaller than the natural flaw size pre-existing in polymers, are nucleated: this process results in material costs savings without significant reductions and sometimes improvements in mechanical properties. They are characterized by average cell diameter sizes on the order of 0. 1 to 10 μm, cell densities on the order of 109 to 1015 cells/cm3, and specific density reductions (relative to the unfoamed plastic) from 5 to 95 percent. In this paper, the basic concept of foaming for microcellular plastics is described and the process technology of microcellular plastics based on that concept is introduced. The effect of pressure in processing of microcelullar plastics is discussed.
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