苯乙烯丙烯酸共聚物分散剂在氟铃脲颗粒界面的吸附性能

利用残余质量浓度法、ζ电位测定、红外光谱和XPS法系统地研究了苯乙烯丙烯酸共聚物(MOTAS)分散剂在氟铃脲颗粒界面的吸附量、吸附状态、ζ电位、吸附作用力和吸附层厚度等性能. 实验结果表明, MOTAS分散剂在氟铃脲界面的吸附符合Langmuir吸附等温式, 其饱和吸附量和吸附平衡常数k、ζ电位和吸附层厚度均随MOTAS分散剂相对分子量增加而增大, MOTAS分散剂在氟铃脲界面呈多点吸附, 氢键是分散剂分子与氟铃脲界面结合的重要作用力. 分析实验结果发现, MOTAS分散剂在氟铃脲颗粒界面吸附后具有静电排斥和空间位阻双重作用.

Adsorption Properties of MOTAS Dispersant on the Interface of Hexaflumuron Particles

The adsorption properties of styrene-aerylic copolymer dispersant(MOTAS) dispersant on the interface of hexaflumuron particles, such as adsorbed amounts, adsorption state, ζ potential, adsorption force, absorption layer thickness and so on, were studied with the methods of remnant mass concentration, ζ potential instrument, IR and XPS. The results show that the adsorption of MOTAS dispersant on the interface of hexaflumuron particles is correspond with Langmuir equilibrium. The saturated adsorbed amounts, adsorption equilibrium constant k, ζ potential and the absorption layer thickness increase with the dispersant molecular weight increasing. The adsorption of MOTAS dispersant on the interface of hexaflumuron particles is multipoint adsorption, and the hydrogen bond is important force in the combination. The interactions of MOTAS dispersants and hexaflumuron are electrostatic exclusion and stereo-hindrance double effect. This is very important to maintain the stability of hexaflumuron suspension concentrate.