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复配改性工业木质素/木纤维复合材料的制备与表征

, PP. 1098-1105

Keywords: 复配改性,工业木质素,聚乙烯亚胺,复合材料,性能表征

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Abstract:

以H2O2为氧化剂对工业木质素进行改性,将H2O2氧化改性工业木质素(OMIL)与聚乙烯亚胺(PEI)复配制得复配改性工业木质素(OMIL-PEI)。以木纤维(WF)为基体,OMIL-PEI为黏结相,采用高速混合-平板热压工艺制备了环保型OMIL-PEI/WF复合材料。采用正交试验设计方法研究了H2O2用量、氧化时间、OMIL与PEI质量比及复配剂OMIL-PEI用量对该复合材料物理力学性能的影响,探索了复合材料的最优制备工艺参数,并采用FTIR、XRD、DMA和SEM对复合材料的结构和性能进行了表征。结果表明:最优工艺条件为,H2O2用量20wt%,氧化时间120min,OMIL与PEI质量比7:1,OMIL-PEI用量20wt%,所制备的复合材料各项理化性能满足GB/T11718-2009干燥状态下使用的承重型中密度纤维板的性能要求;OMIL-PEI能够与WF在热压过程中形成良好的化学键;优化工艺条件下的OMIL-PEI/WF复合材料的木质纤维素的晶形结构保持不变,相对结晶度从60.24%(纯WF)升高到72.91%;OMIL-PEI提高了OMIL-PEI/WF复合材料的动态储能模量,对材料的热稳定性影响不大,且各组分之间分布均匀,交织致密,界面粘结性能良好。

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