“…Foaming material has been widely used in a variety of fields, such as heat insulating, shock buffering, weight reducing, sound proofing, and so forth. The specific applications or forms of foaming material include sponges for sofa, foam pads for vibration reduction in package, foam plates for soundproofing, foam plates for energy saving as exterior walls of building, foam membranes against stress, diverse foam trays, and so forth. Currently, most raw materials of the foaming materials commonly used in daily life are organic, such as polyurethane (PU), polystyrene (PS), and poly(vinyl chloride) (PVC), polyethylene (PE), urea‐formaldehyde (UF), and so forth.…”