ABSTRACT
New phase formation is a common physical and chemical phenomenon and includes actions such as boiling, foaming, solidication, decomposition, and so on [1-3]. It is a key element in quite a few phase separation processes, for instance, evaporation, crystallization, devolatilization [4], and foam extrusion [5-7]. Focusing on physical phenomena, new phase formation, also known as nucleation, can originate from self-structural adjustment or from foreign “seeds” as a way to release an outside change-induced load. Its unstable nature easily lends itself to unstable phase separation. Foaming basically involves bubble nucleation and bubble growth (phase separation) to make a foamed product that can be dened as visible gas cells dispersed in a denser continuum matrix.
