Pursuing advanced materials never stops. Due to small cell size, high cell population density, and uniform cell size distribution, plastic foams have been widely applied in the fields of MEMS, biomedical materials, automotive, construction, and so on. During the manufacturing of plastic foams, cell-to-cell diffusion governs the final nature, structure and density of foamed products. Thus, fundamental understanding of cell-to-cell diffusion in plastic foaming is essential. In this book, mechanisms of cell-to-cell diffusion are elucidated through the following studies. Firstly, a ...