Polyurethanes from Kraft Lignin without Using Isocyanates

• 作者: A.Pizzi F.J.Santiago-Medina L.Delmotte M.C.Basso
• 来源期刊: 可再生材料杂志(英文)
• 学科: 化学
• 关键词: LIGNIN URETHANES non-isocyanate polyurethanes MALDI-TOF FTIR
• 年，卷（期）: kzsclzzyw_2018,（4）
• 页码范围: 413-425
• 页数: 13页
• 分类号: O62

摘要

The reaction of a desulphurized kraft lignin with hexamethylene diamine and dimethyl carbonate has allowed the development of isocyanate-free polyurethane resins.The present research work is based on previous studies made with hydrolyzable and condensed tannins,but takes advantage of the higher number of hydroxyl groups present in lignin and their different aliphatic and aromatic character.The obtained materials were analyzed by Fourier transform infrared(FTIR)spectroscopy,matrix-assisted laser desorption ionization time-of-flight(MALDI-TOF)mass spectrometry and solid-state cross-polarization/magic angle spinning(CP MAS)13C nuclear magnetic resonance(NMR),which have revealed the presence of urethane functions.The interpretation of the results has shown a larger number of species than when tannins were used and has indicated the presence of two types of bonds in the new molecules formed:ionic and covalent bonds.