1[1]Thomas L S,Curtis J R. Low unsaturation PPG polyol blends with PTMEG in elastomers. Utech Asia'97 Paper 43,1～ 6
2[2]Schuchardt J L, Harper S D. Preparation of high molecular weight polyols using double metal cyanide catalysts. Proceedings of the SPI-32nd Annual Technical Marketing Conference 1989:360～364
