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28.88 mN/ 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 me-chanical 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 in-terfacial compatibility with thermoplastics, which was also confirmed by the better mechanical properties of wood-plastic composites.
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