SOLVENT PRETREATMENT OF LIGNIN FOR OBTAINING OF LOW VISCOSITY LIGNOPOLYOLS BY OXYPROPYLATION FOR SYNTHESIS OF POLYURETHANES

Baltic Polymer Symposium 2015

材料科学;化学

Jablonskis, A.^1 ; Arshanitsa, A.^1 ; Telysheva, G.^1

Latvian State Institute of Wood Chemistry, Riga, Latvia^1

关键词: Cross-linked polymers;    ITS applications;    Low viscosity;    Oxypropylation;    Rigid polyurethane foams;    Sequential extraction technique;    Solvent pretreatment;    Solvent soluble fraction;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/111/1/012007/pdf
DOI  :  10.1088/1757-899X/111/1/012007

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Wheat straw lignin was pretreated by organic solvents of different polarity: ethylacetate, ethylmethylketone and ethylmethylketone/water mixture, using sequential extraction technique. The total yield of fractions was ∼ 40% (w/w). In comparison with non- treated lignin the solvent soluble fractions have lower molecular weights, lower polydispersity and average functionality indices. The low viscosity lignopolyols with lignin substituent content up to 40%, suitable for rigid polyurethane foams obtaining were produced by the oxypropylation of isolated fractions. The non-soluble in organic solvents lignin residue represent a purified natural aromatic amorphous cross-linked polymer. Therefore besides oxypropylation its application as filler of thermostable polymers with enhanced flammable resistance could be beneficial biorefinery approach.