The preparation of new perfluoro ether fluids exhibiting excellent thermal-oxidative stabilities
The preparation of new perfluoro ether fluids exhibiting excellent thermal-oxidative stabilities
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具有优异热氧化稳定性的新型全氟醚流体的制备
DOI：
10.1021/ie00080a024
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发表时间：
1988
影响因子：
4.2
通讯作者：
R. Lagow
中科院分区：
文献类型：
--
作者：
W. R. Jones;T. Bierschenk;T. Juhlke;Hajima Kawa;R. Lagow
采用直接酯化法合成了一系列低分子量全氟烷基醚。测定了其粘温特性和氧化稳定性。粘度-温度相关性表明支化的增加和支化取代基尺寸的增加导致粘度特性的劣化（即，ASTM斜率增加）。此外，增加这些化合物中的碳与氧的比率也增加了ASTM斜率。初步的氧化稳定性测量表明，高度支化的PFAE流体（即，含有季碳的那些）可能比含有单个三氟甲基侧基的那些或根本不含支化的那些稳定性差。
A series of low molecular weight perfluoroalkyl ethers (PFAEs) were synthesized by direct fluorination. Viscosity-temperature properties and oxidation stabilities were determined. Viscosity-temperature correlations indicated that increases in branching and increases in the size of the branching substituent caused a deterioration in viscometric properties (i.e., an increase in ASTM slope). In addition, increasing the ratio of carbon to oxygen in these compounds also increased the ASTM slope. Preliminary oxidation stability measurements indicated that highly branched PFAE fluids (i.e., those containing quaternary carbons) may be less stable than either those containing a single trifluoromethyl pendant group or those containing no branching at all.