title: Preparation of lignopolyols from wheat straw soda lignin.
abstract: Wheat straw soda lignin was modified and characterized by several qualitative and quantitative methods such as (31)P NMR spectroscopy to evaluate its potential as a substitute for polyols in view of polyurethane applications. Chemical modification of the lignin was achieved with propylene oxide to form lignopolyol derivatives. This was performed by a two-step reaction of lignin with maleic anhydride followed by propylene oxide and by direct oxyalkylation under acidic and alkaline conditions. The physical and chemical properties of lignopolyols from each method and the subsequent chain-extended hydroxyl groups were evaluated. Direct oxyalkylation of lignin under alkaline conditions was found to be more efficient than acidic conditions and more effective than the two-step process for preparing lignopolyol with higher aliphatic hydroxyl contents.
authors.affiliation: Biotechnology Research Institute, National Research Council of Canada , 6100 Royalmount Avenue, Montréal, Québec, Canada H4P 2R2. behzad.ahvazi@cnrc-nrc.gc.ca
authors.forename: Behzad
authors.initials: B
authors.lastname: Ahvazi
authors.forename: Olivia
authors.initials: O
authors.lastname: Wojciechowicz
authors.forename: Tan-Minh
authors.initials: TM
authors.lastname: Ton-That
authors.forename: Jalal
authors.initials: J
authors.lastname: Hawari
mesh_terms: D004852:Epoxy Compounds / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D008031:Lignin / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008299:Maleic Anhydrides / Q000737:chemistry; D011108:Polymers / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D014908:Triticum / Q000737:chemistry*
chemical_list: D004852:Epoxy Compounds; D008299:Maleic Anhydrides; D011108:Polymers; C024617:polyol; D008031:Lignin; C009068:propylene oxide