论文部分内容阅读
采用木聚糖酶溶液对西南桦木粉进行处理,并利用热压成型工艺制得西南桦木/高密度聚乙烯(HDPE)复合材料,考察酶溶液浓度、处理时间及温度对西南桦木/HDPE复合材料拉伸强度、弯曲强度等力学性能的影响,从而获得木聚糖酶处理的最佳工艺条件。借助傅里叶红外光谱分析技术和扫描电子显微镜,分析木聚糖酶处理后西南桦木纤维的化学官能团变化和西南桦木/HDPE复合材料的断面形貌。结果表明:木聚糖酶处理能够增强西南桦木/HDPE复合材料的界面结合。在木聚糖酶溶液浓度为2.67mg/L,温度为40℃,pH值为4.5的条件下处理2h后,西南桦木粉的纤维素相对含量及结晶度增加,半纤维含量减小,木质素相对含量增加;木纤维的材质变软、表面变得粗糙,增大了与塑料分子的接触面积,从而提高了西南桦木/HDPE复合材料的力学性能。
The xylanase solution was used to treat southwest birch powder and the southwestern birch / high density polyethylene (HDPE) composite was prepared by hot press forming process. The effects of enzyme solution concentration, treatment time and temperature on the yield of birch / HDPE composites Tensile strength, bending strength and other mechanical properties, so as to obtain the optimum conditions of xylanase treatment. The chemical functional groups of birch fiber in southwest China and the cross-sectional morphology of birch wood / HDPE composites in Southwestern China were analyzed by Fourier transform infrared spectroscopy and scanning electron microscopy. The results showed that xylanase could enhance the interfacial bonding between birch composites and HDPE composites. After treated with xylanase at a concentration of 2.67mg / L, a temperature of 40 ℃ and a pH value of 4.5 for 2h, the relative content and crystallinity of birch powder increased, the content of hemicellulose decreased, the content of lignin The relative content increased; the material of wood fiber became soft and the surface became rough, which increased the contact area with plastic molecules and improved the mechanical properties of birchwood / HDPE composites.