Polymer Supercritical CO Foaming under Peculiar Conditions: Laser and Ultrasound Implementation.

The two-step batch foaming process of solid-state assisted by supercritical CO is a versatile technique for the foaming of polymers. In this work, it was assisted by an out-of-autoclave technology: either using lasers or ultrasound (US). Laser-aided foaming was only tested in the preliminary experiments; most of the work involved US.