8Frisch K C. History of science and technology of polymeric foams [J]. JMacromolSciChem, 1981, A15(6):1089-1112.
9Kuryla W C, Critchfield F R, Platt L W, et al. Polymer/polyols, a new class of poluerethane intermediates[ J ]. J Cell Plast, 1966, 2 (2) : 84 -96.
10Sponton M, Casis N, Mazo P, et al. Biodegration study of Psedo- monas, of flexible polyurethane foams derived from castor oil [ J ]. International Biodeterioration & Biodegradation, 2013, 85:85 -94.
