木质素基聚氨酯泡沫的合成

Synthesis of Acetic Acid Lignin Polyurethane Foams

提取乙酸法制浆废液中的木质素(AAL),采用FT-IR和31P-NMR光谱分析其结构,并用AAL取代部分聚乙二醇合成聚氨酯泡沫(PUF),采用TGA、DSC和压缩实验对PUF进行热性能和机械性能研究。实验结果表明:AAL具有典型的聚多元醇结构,当AAL添加量为20%(相对聚乙二醇1000的质量)时,合成PUF的密度为0.23g/cm3,此时PUF的压缩模量(E)最大,为164.4kPa。添加AAL对PUF的玻璃化温度影响不明显,但其开始分解温度升高,使合成的PUF具有较好的耐热性。

Acetic acid lignin （AAL） was isolated from acetic acid pulping waste liquor. The structure of AAL was characterized by Fourier infrared spectroscopy （FT-IR） and 31P-NMR spectrum. AAL was used to substitute for part of polyethylene glycol （PEG） in the synthesis of polyurethane foams （PUF）. Thermal stability and physical characteristics of ALL-based polyurethane foams were determined by TGA/DSC and compression tests, respectively. The results showed that AAL has the typical structure of polyol. The density of AAL-based polyurethane foams is O. 20 -0.28 g/cm3. When the dosage of lignin added in the foam is about 20%, the compression modulus is maximum, which is 164.4 kPa. In addition, the result also showed that the AAL addition has no significant effect on glass transition temperature of the polyure- thane foams, but the start degradation temperature and the mass residue ratio of polyurethane increase, which indicates that the AAL-based polyurethane foams have better heat resistance than that without AAL.