基于叶片的表面自由能与分量明确4种经济作物的叶面润湿性能

摘要

To calculate the surface free energy (SFE),spersion component and polarity component of different industrial plants,provide practical data for screening of pesticide surface additives and characterizing of the surface wettability,the paper studied the contact angle of abaxial and adaxial surfaces for three standaM reagent of deionized water,ethylene glycol and DMF at four kinds of plants,by using leaves of the target plants as materials and optical contact angle measuring device,and used OWRK method to count.The results showed that the SFE value of the adaxial surface of Brassica oleracea,Lactuca sativa Linn.var.ramosa,Brassila rapa,Malus p umila leaves were 25.33,36.34,58.59,52.76 MJ/m2,respectively,while the SFE value of the abaxial surface were 28.13,48.49,19.31,21.78 MJ/m2,respectively.The results indicated that the dispersion component was dominant in the leaves of Brassica oleracea and Lactuca sativa Linn.var.ramose,and these two vegetable were suitable for the pesticides,which adjuvant was dominant by the dispersion component,while leaves of Brassica rapa and Malus pumila were dominant by polarity component and suitable for the pesticides that adjuvant was dominant by polarity component.%为了测得4种经济作物叶片的近、远轴面的表面自由能及其色散力分量与极性分量,为其农药表面助剂的筛选及叶表面润湿性能的表征提供一定的数据支持,采用光学视频接触角测量仪,通过研究去离子水、乙二醇、N,N-二甲基甲酰胺标准试剂,以4种靶标作物甘蓝、小白菜、生菜、苹果树的叶片为材料,测量叶片远轴面与近轴面的接触角,并利用Owens-Wendt-Rabel-Kaelble (OWRK)法计算.结果表明,甘蓝、生菜、小白菜和苹果树的叶片近轴面的表面自由能分别为25.33,36.34,58.59,52.76 MJ/m2,而远轴面的表面自由能分别为28.13,48.49,19.31,21.78 MJ/m2.甘蓝和生菜的叶片均以色散力分量为主,适合使用助剂以色散力为主的农药,而小白菜和苹果树的叶片则以极性分量为主,适合使用助剂以极性为主的农药.