林产化学与工业2017，Vol.37Issue(1)：63-72,10.DOI:10.3969/j.issn.0253-2417.2017.01.008
木质素基聚氨酯预聚体改性酚醛泡沫的制备及表征
Preparation and Characterization of PhenolicFoams Modified by Lignin-basedPolyurethane Prepolymers
摘要
Abstract
Lignin was liquefied with polyethylene glycol (PEG) in a solvent-free system and then directly used with suitable PEG as a co-monomer and co-solvent to prepare liquefied lignins (LLs)-based polyurethane prepolymers (LLPUPs).The structural changes that lignin undergoes after liquefaction were studied by Fourier transform infrared spectroscopy (FT-IR), the hydroxyl number of LL is 177-286 mg/g and decreases with the increasing of molecular mass of PEG.The structures of LLPUPs were characterized by FT-IR.Then, phenolic foams (PFs) modified with different contents of LLPUPs were prepared.Morphological properties, mechanical properties and thermal stability of PFs were assessed by scanning electron microscopy (SEM), universal test and thermogravimetric analysis (TGA).Results show that uniform cells can be prepared by incorporating 9% LLPUP1 and LLPUP2 into the network.The addition of LLPUPs into foam formulations improves the compressive strength and specific compressive strength of PFs, and the highest specific compressive strength is obtained by adding 9% LLPUP2 (4.44(Pa·m3)/g).Appropriate levels of LLPUPs could improve the specific flexural strength of PFs, and the highest specific flexural strength is obtained by adding 9% LLPUP1 (8.23(Pa·m3)/g).PFs modified with different contents of LLPUPs show similar thermal resistance as pristine foam.关键词
液化木质素/酚醛泡沫/聚氨酯预聚体/表征Key words
liquefied lignin/phenolic foams/polyurethane prepolymer/characterization分类
化学化工引用本文复制引用
薄采颖,胡立红,杨晓慧,郑敏睿,张猛,周永红..木质素基聚氨酯预聚体改性酚醛泡沫的制备及表征[J].林产化学与工业,2017,37(1):63-72,10.基金项目
国家自然科学基金资助项目(31470613) （31470613）
江苏省生物质绿色燃料与化学品重点实验室开放基金(JSBGFC14002) （JSBGFC14002）
