【摘要】 以麦草碱木质素、聚乙二醇(PEG)及多苯基甲烷多异氰酸酯(PAPI)为原料,以N,N-二甲基甲酰胺为溶剂,使用溶液固化成型法制备了碱木质素聚氨酯薄膜。采用差示扫描量热法(DSC)表征了薄膜的热性能,并测定了木质素聚氨酯薄膜的弹性模量、拉伸强度和拉伸率。试验结果表明:当使用PEG300、异氰酸酯指数为2.2、木质素加入量为11%(质量分数)时,聚氨酯薄膜的弹性模量为0.52GPa、拉伸强度69.1MPa、拉伸率15.6%,且成膜性能良好。更多还原

【Abstract】 Lignin-based polyurethane(PU)films were prepared from wheat straw alkali lignin by solution casting with polyethylene glycol(PEG)and polymeric phenyl methane-diisocyanate(PAPI)in the solvent of N,N-dimethyl-formamide(DMF).The thermal performances of lignin-based PU films were tested by Differential Scanning Calorimetry(DSC).Furthermore,the Young’s modulus,tensile strength and elongation at break were also determined for the lignin-based PU films.Results showed that the Young’s modulus,tensile strength and elongation at break were 0.52 GPa,69.1 MPa and 15.6 percent,respectively,under the conditions of NCO OH ratios of 2.2 and 11 percent lignin content(calculated as the weight of PEG)with PEG 300,and its moulding performance was good.更多还原