聚乙二醇全氟壬烯基醚的合成与表面性能

Preparations and Surfactivities of Polyethylene Glycol Perfluorousnonenyl Ethers

摘要:

以全氟壬烯（C9F19）和聚乙二醇（PEG-n）为主要原料，合成了非离子氟碳表面活性剂聚乙二醇全氟壬烯基单醚C9F17–PEG-n和双醚C9F17–PEG-n–C9F17，研究了分子结构与其水溶液表面性能之间的关系。测定了C9F17–PEG-n和C9F17–PEG-n–C9F17的表面张力（γ）、临界胶束浓度（CMC）、浊点、泡沫性能和乳化性能。结果表明：双醚比单醚的极限分子面积（Amin）小、饱和吸附量（Γm）大，浊点低、对甲苯的乳化性能差；其水溶液的表面活性好、发泡体积大。对C9F17–PEG-n或C9F17–PEG-n–C9F17而言，随着n上升，其Amin增加，Γm下降，对甲苯的乳化性能趋好；其水溶液的CMC和γCMC上升，浊点升高，发泡体积先升高后下降，n= 1000时发泡体积最大。

Abstract:

Polyethylene glycol perfluorononyl monoethers (C9F17–PEG-n) and diethers (C9F17 –PEG-n–C9F17) were prepared from polyethylene glycol (PEG-n) and perfluorononene (C9F18), the relations of surface performances to molecular of C9F17–PEG-n and C9F17–PEG-n –C9F17 were investigated. Their surface tensions(γ), critical micelle concentrations(CMC), cloud points, foaming characterisitics and emulsifiabilities were studied. C9F17–PEG-n–C9F17) is smaller minimum molecular area(Amin), greater saturated adsorption quantity (Γm), lower clued point, worse emulsifiability for toluene, but better surfactivities and greater foaming volume of their aqueous solutions than C9F17–PEG-n. For C9F17–PEG-n or C9F17–PEG-n–C9F17, Γm decline, Amin increase and the emulsifiability becomes better for toluene along with the increase of n; the CMC, γCMC and clued point of their aqueous solutions ascend, their foaming volumes increase and then decline and get the biggest value at n=1000.