HDPE/木质素复合材料的制备及性能

采用甲酸法制备了木质素,将木质素和羟甲基化木质素分别与高密度聚乙烯(HDPE)熔融共混制备了 HDPE／木质素复合材料,研究了其力学性能和相态结构。结果表明:随术质素或羟甲基化木质素加入量的增加,复合材料的断裂伸长率逐渐提高;弯曲模量和弯曲强度随羟甲基化木质素含量的增加分别提高了17.3％和12．2％;与木质素共混时,弯曲强度在木质素质量分数为2．5％处达到最高值(16．1 MPa),随后叉呈下降趋势;HDPE／木质素和 HDPE／羟甲基化木质素的断裂拉伸强度分别提高了8．0％和16．2％;但材料的抗冲击性能有所降低;总体上,木质素的羟甲基化使复合材料的性能优于木质素复合材料。

Preparation and properties of HDPE/lignin composite

High density polyethylene (HDPE)/lignin composites were prepared via melt blending of HDPE with lignin or hydroxymethylated lignin, respectively. The bamboo-lignin was manufactured in the process of formic acid. The study on the mechanical properties and phase structure of the composites reveals that elongation at break of the composites gradually increases with content of lignin or hydroxymethylated lignin. The bending modulus and bending strength increase with dosage of hydroxymethylated by 17.3% and 12.2%, respectively. The bending strength reaches its maximum value of 16.1 MPa at the mass fraction of lignin of 2.5% and then exhibits a tendency of declining as the lignin dosage further rises. The tensile strength of the composite HDPE/lignin and HDPE/hydroxymethylated lignin is raised by 8.0% and 16.2%, respectively, while its impact resistance lowers somewhat. In general, the properties of HDPE/hydroxymethylated lignin are superior to those of HDPE/lignin.