7T M Ponfiff. Modem Plastics[J] .Mid-November 1997: C-12.
8L M Sherman. Plastics Technology[J].March 1996:42.
9Rowland, Donald G, Hunter, et al. Blowing agent composition[ P]. USP4692475,1987.
10Humik, Helmut, Finzenhagen, et al.New blowing agent combination based on azodicarbonamide, production thereof and use thereof for foaming polymers[ P]. USP4714568,1987.