目 的 改善木质纤维与 热塑性塑料的界面相容性, 提高木塑复合材料的力 学性能。 方法 采用毛细管上升法测定不同 探测液在未改性玉米秸秆粉和硅烷偶联剂 改性玉米秸秆粉表面的 接触角 , 通过Owens 法计算玉米秸秆粉改性前后的表面张力及其分量。 结果 未改性玉米秸秆粉的表面张力 为 28. 88mN /m, 极性分量为 22. 20 mN /m; 而改性玉米秸秆粉的 表面张力 为 35. 69 mN /m, 极性分量为 3. 51 mN /m。 结论 在与 热塑性塑料复合时, 改性玉米秸秆粉有更好的 界面相容性, 其制 备的 木塑复合材料有更好的力学强度。

Objective To improve the interfacial compatibility of lignocellulose with thermoplastic plastics, and increase the mechanical properties of wood-plastic composites. Methods The contact angles of three probe liquids against unmodified and modified corn stover fibers were tested by capillary rise method, and the surface tension and its components of unmodified and modified corn stover fibers were calculated based on the method of Owens-wendt-Kaelble. Results The results showed that the surface tension of the unmodified corn stover fibers was 28. 88 mN/m and its polar component was 22. 20 mN/m, while the surface tension of the modified corn stover fibers was 35. 69 mN/m and its polar component was 3. 51 mN/m. Conclusion Modified corn stover fibers had better interfacial compatibility with thermoplastics, which was also confirmed by the better mechanical properties of wood-plastic composites.