改性玉米秸秆粉界面相容性的研究

Study on the Interfacial Compatibility of Modified Corn Stover Fibers

通过4%硅烷偶联剂对玉米秸秆粉表面改性,采用毛细管上升法,测定不同润湿液在其表面的接触角,由Washburn方程和Owens-wendt-Kaelble途径计算玉米秸秆粉的表面张力及其分量。结果表明,在加工温度下高密度聚乙烯(HDPE)液体表面张力(31.2 mN/m)低于改性玉米秸秆粉的值(22.20 mN/m),表明HDPE更易在改性玉米秸秆粉表面铺展;同时,改性玉米秸秆粉其极性分量由未改性时22.20 mN/m降低为3.51 mN/m,在与热塑性塑料复合时,它有更好的界面相容性。

Corn stover fibers were modified by 4% silane coupling agent.Then the contact angles of three different wetting liquids against unmodified and modified corn stover fibers were measured by capillary rise method.Based on Washburn equation and the method of Owens-wendt-Kaelble,the surface tension and its components of unmodified and modified corn stover fibers were calculated.The results showed that the surface tension( 31.2 mN /m) of high-density-polyethylene( HDPE) is lower than that( 22.20 mN /m) of modified corn stover fibers,so HDPE could spread out on the surface of modified corn stover fibers more easily.Moreover,the polar component of surface tension of modified corn stover fibers decreased from 22.20 mN /m( unmodified) to 3.51 mN /m,therefore,modified corn stover fibers have better interfacial compatibility with thermoplastics.