Polysulfone(PSU)and Polyphenylsulphone(PPSU)are high temperature materials with excellent mechanical properties,chemical resistance abilities and flame retardant properties which can meet the requirement of many special application fields.Green preparation of their light-weight materials using supercritical CO_2 foaming polymer technology is important for their low-cost application.First,a solid-state batch temperature-rising foaming process was used to prepare PPSU foams with microcellular and nanocellular...