摘要
采用乙酸酐溶液对桦木粉进行酯化处理后热压制得HDPE/桦木粉木塑复合材料。考察了反应条件对复合材料力学性能的影响,利用傅立叶红外光谱(FTIR)分析酯化处理前后的木纤维表面官能团,借助电子显微镜和计算机显微图像测试软件处理前后的木材的解剖性质,采用扫描电子显微镜(SEM)观察处理前后复合材料的断面形貌,从而得出最佳的处理工艺,并分析酯化反应程度与木塑复合材料力学强度的相关性。结果表明:控制木纤维的酯化反应程度可以有效改善木纤维表面的疏水性,改变纤维形态和微观形貌,从而提高木塑复合材料的界面结合强度;酯化处理木粉后,反应生成的乙酰基部分取代了纤维表面的羟基,降低了木纤维表面极性,而且木纤维的长度和壁厚有所增大;酯化处理后的木纤维表面平整光滑,且复合材料更加致密。
Birch wood powder was treated in acetic anhydride solution, and birch wood powder composites incorporated with high density polyethylene （HDPE） were prepared by hot-pressing technology. Effects of reaction conditions on the mechanical properties of the composites were determined. The transformations of functional groups in wood fibers were analyzed by FTIR and their anatomical properties were investigated using electronic microscope and micrograph analysis system of computer. The morphologies of fracture surfaces were observed using a scanning electron microscope （SEM）. The optimum chemical reaction conditions of the wood flour in the acetic anhydride solution have been obtained. The correlation with the extent of esterification reaction and the mechanical strength of the wood plastic composites was analyzed. The results show that the surface hydrophobicity of the wood fibers could be improved effectively and their configuration and micro-morphology could be changed by controlling the extent of esterification in order to increase the interracial bonding strength of the wood plastic composites. After the birch wood powder treated by acetic anhydride solution, the polarity of the wood fibers was reduced due to the hydroxyl groups partly replaced by the acetyl groups and the length and wall thickness of wood fibers became increasing. Moreover, the surface of the wood fibers treated became smoother and the wood plastic composites became denser.
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2014年第4期572-576,612,共6页
Journal of Materials Science and Engineering
基金
四川省教育厅重点基金资助项目(00329800)
关键词
木塑复合材料
酯化作用
力学性能
解剖性质
界面结合
wood plastic composites
esterification
mechanical properties
anatomical properties
interracial bonding
