ABSTRACT
Polymers demonstrate an interesting property range, from as soft as sponge to as hard as rock, from half time expansion to 250 times expansion, etc. The presence of gas basically increases the property dimension of the polymer matrix by expansion to make foam a new product with new properties. The derived mechanical, thermal, acoustic, cushioning properties are unique characteristics for foam, which are important properties for certain areas of our daily life. As a result, foam continues to penetrate into markets for special applications. Some properties as can be conceived are primarily controlled by the amount of gas, and some others by the kind of gas, and the cell size and its distribution. This chapter is focused on the property dependency of the structural parameters.
