Corn stalk enzymatic lignin-based polyurethane foams were prepared by two methods; blending and liquefaction modification. The structure of lignin-based polyurethane foam was characterized by Fourier infrared spectroscopy ( FTIR). The effect of the two types of preparation methods on physical characteristics and dynamic mechanical property of lignin-based polyurethane foams were determined by compression test and dynamic mechanical analysis( DMA) , respectively. The result showed that the density of polyurethane foams from liquefaction modification method was lower than those from blending method. The gel content and compressive strength of polyurethane foams based on liquefaction product were higher than those from blending method. The maximal compressive strength of polyurethane foam reached 291 kPa when the substitution of liquefaction products up to 30% based on the total polyol. When the substitution for polyol was lower than 30% , the glass transition temperature of the polyurethane foams from liquefaction method was higher than those from blending method.%利用玉米秸秆酶解木质素通过添加和液化改性2种方法分别制备填充型和液化改性型聚氨酯泡沫.采用红外光谱(FTIR)对聚氨酯泡沫的结构进行表征,并通过压缩试验和动态机械(DMA)试验分别测定2种制备方法对聚氨酯泡沫的物理性能和动态力学性能的影响.结果表明:液化改性型聚氨酯泡沫密度低于填充型聚氨酯泡沫,凝胶量和压缩强度要高于填充型聚氨酯泡沫.当木质素液化产物添加量为30％时,液化改性型聚氨酯泡沫的压缩强度达到最大值291 kPa.当多元醇替代物含量低于30％时,液化改性型聚氨酯泡沫的玻璃化温度稍高于填充型聚氨酯泡沫.
展开▼
