By using polyether polyol (N330、N220)

polyester polyol (PNA) and liquefied diphenylmethane diisocyanate (MDI) as the main raw materials

the flexible polyurethane foam was prepared by one-step method. The structure

tensile strength

resiliency

thermal stability and cell structure of foam products were analyzed by infrared spectroscopy

tensile experiment

rebound experiment

thermogravimetric analysis and optical microscope observation. The effects of the feed ratio of PNA and the proportions of different catalysts on the property and cell structure of the polyurethane foam were discussed. The results showed that the foam products performed best with 15 % PNA added; and the cell structure of resulted polyurethane foam was uniform and displayed satisfied mechanical properties when the proportion of bis (2- dimethylaminoethyl)ether(A-l)

triethanolamine(TEOA) and stannous octoate(T-9) was 0. 1:0. 6:0. 2.