Poly (p-pheneylene 2-6 benzobisoxazole) (PBO) compositions that can be used as resins, used as adhesives or adhesive components, used to form films and laminates and used to form foamed articles. The PBO compositions demonstrate high heat resistance, chemical stability, low flammability and low toxic fume generation. Foams can be produced from the PBO compositions that have a range of open and closed cellular structures. The PBO foams have specific densities of from at least about 0.25 lbs/ft
3
to at least 50 lbs/ft
3
.
Poly (p-pheneylene 2-6 benzobisoxazole) (PBO) compositions that can be used as resins, used as adhesives or adhesive components, used to form films and laminates and used to form foamed articles. The PBO compositions demonstrate high heat resistance, chemical stability, low flammability and low toxic fume generation. Foams can be produced from the compositions that have a range of open and closed cellular structures. The foams have specific densities of from at least about 0.25 lbs/ft3 to at least 50 lbs/ft?.