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首页> 外文期刊>Journal of Applied Polymer Science >PERFLUOROPOLYETHERS WITH ACID END GROUPS - AMPHIPHILICITY AND EMULSIFICATION
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PERFLUOROPOLYETHERS WITH ACID END GROUPS - AMPHIPHILICITY AND EMULSIFICATION

机译：带有酸端基的全氟聚酯-亲水性和乳化性

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摘要

Interactions of PFPE-acids (perfluoropolyethers with carboxylic end groups) with a metal oxide surface and with aqueous systems were examined. The study revealed that (1) PFPE-acids are preferentially adsorbed on metal oxide (ZrO2) surfaces over PFPE of nonfunctionalized form, (2) PFPE-acids of shorter chain length are preferentially adsorbed over PFPE-acids of longer dimension, and (3) the low molecular weight fraction (MW = 1300) of Demnum-SH is abundant in molecular chains terminated with the acid end group at both ends. The study also revealed that PFPE-acids, if agitated with aqueous solution of electrolyte, form an extremely stable macroemulsion of the water-in-oil type. The emulsion is extremely viscoelastic and may contain 50% by weight (hence, 65% by volume) of water. Water is occluded as droplets of diameter of 1-100 microns. A mechanism exists whereby aqueous protons are transported between droplets with the transfer rate greater than or equal to 50 Hz at room temperature. Relevance of these observations in the lubricant application of PFPEs in magnetic recording media is discussed. (C) 1995 John Wiley and Sons, Inc. [References: 16]
机译：检查了PFPE-酸（具有羧基端基的全氟聚醚）与金属氧化物表面以及与水性体系的相互作用。研究表明（1）PFPE酸比非官能化形式的PFPE优先吸附在金属氧化物（ZrO2）表面上;（2）链长较短的PFPE酸优先于较长尺寸的PFPE酸优先吸附;以及（3 ）Demnum-SH的低分子量部分（MW = 1300）在两端均带有酸端基的分子链中丰富。研究还表明，PFPE-酸如果与电解质水溶液一起搅拌，会形成油包水型的极其稳定的大乳液。该乳液是极粘弹性的，可以包含50重量％（因此为65体积％）的水。水被阻塞为直径为1-100微米的液滴。存在一种机制，在室温下，质子在液滴之间以大于或等于50 Hz的传输速率传输。讨论了这些观察结果对PFPE在磁记录介质中的润滑剂应用的相关性。 （C）1995 John Wiley and Sons，Inc. [参考：16]

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