聚羧酸型梳状共聚物超分散剂在氟虫腈颗粒界面的吸附性能  

Adsorption Properties of Comb-shaped Copolymer of Polycarboxylic Acid Superplasticizer on the Interface of Fipronil Particles

作　　者：马超[1] 徐妍[1] 郭鑫宇[1] 罗湘仁[1] 吴学民[1] 

机构地区：[1]中国农业大学应用化学系,农业部农药化学与应用重点开放实验室,北京100193

出　　处：《高等学校化学学报》2013年第6期1441-1449,共9页Chemical Journal of Chinese Universities

基　　金：国家“十二五”科技支撑计划项目(批准号:2011BAE06A06-10)资助

摘　　要：采用紫外光谱(UV)、傅里叶变换红外光谱(FTIR)、X射线光电子能谱(XPS)和扫描电子显微镜(SEM)对聚羧酸型梳状共聚物超分散剂(TERSPERSE2700)在氟虫腈颗粒界面的吸附等温线、吸附动力学、吸附作用力、吸附层厚度以及吸附状态等进行了分析.实验结果表明,TERSPERSE2700分散剂在氟虫腈颗粒界面的吸附模型符合Langmuir吸附等温式,吸附量随着温度升高而增大,并计算了ΔG—0,ΔH—0和ΔS—0.吸附符合准一级动力学模型,吸附速率常数随着温度升高而增大,吸附活化能Ea=29.28 kJ/mol.利用XPS谱图,估算其吸附厚度约为1 nm,表明存在吸附作用.实验发现氟虫腈存在分子间氢键,同时氢键也是分散剂分子与氟虫腈颗粒表面结合的重要作用力.The main methods in performing the study of the adsorption properties of hyperdispersant on fipronil interface were UV-Vis,FTIR,XPS and SEM.The kinetics and the thermodynamics of TERSPERSE2700 adsorption on fipronil were studied,and the results suggested that the adsorption of TERSPERSE2700 on the interface of fipronil particles was correspond with Langmuir equilibrium.The low activation energy of 29.28 kJ/mol suggested that it was a physical adsorption process.The free energy of the adsorption at all temperatures were negative indicating a spontaneous process.The peak intensity of F1s,N1s and Cl2p of the interface of fipronil particle decreased obviously.The adsorption layer thickness of TERSPERSE2700 on the fipronil interface was measured through the XPS spectrum and the results showed that the adsorption layer thicknesses of TERSPERSE2700 was about 1 nm.The results of the present study suggested there were hydrogen bonds between fipronil molecules and it was also the main force combining fipronil particles and the dispersant.The results of SEM showed that the fipronil particles became rougher and their dispersion was in good order after adsorption.This study provided a theoretical foundation for development of stable fipronil suspension concentrate and the spectroscopy quantitative analysis of it.

关 键 词：氟虫腈 聚羧酸型梳状共聚物超分散剂 吸附性能 氢键 微观表征 

分 类 号：O647.3[理学—物理化学]