<正>以碱木质素为原料，三氟化硼乙醚为催化剂，用环氧丙烷对碱木质素进行丙氧基化改性后，与环氧氯丙烷反应合成木质素基环氧树脂。以合成的木质素基环氧树脂为基体，有机化蒙脱土为增强材料，采用插层复合法制备了木质素基复合材料。木质素基环氧树脂与有机蒙脱土有很好的相容性，用T31和甲基六氢苯酐作固化剂时，木质素基环氧树脂/有机化蒙脱土（OMMT）复合材料的拉伸强度和冲击强度均高于未加蒙脱土的木质素基环氧树脂。极少量的有机蒙脱土的加入可同时提高木质素基环氧树脂的韧性和强度。

According to the crown growth characteristics in industrial Eucalyptus stand of short rotation, the unit step function model was put forward for the process with changing point of short rotation Eucalyptus clones U6 based on the survey practical stands. The biology signification of the parameter of the model was analyzed by solving the coefficient. The analyzable conclusions of the regression model between crown diameter and age show that the utility of unit step function model in the crown growth process with the changing point is better than the usual regression methods, and the unit step function model can solve discontinuance on the changing point. The optimizing model results show that the power model is the best one in all models tested.