Abstract
AbstractA study was made of the relationship between the structure of some fatty acid esters of varying chain length and their swelling effect on standard nitrile rubber samples. The esters evaluated were: methyl esters of caprylic, capric, lauric, myristic, palmitic and isostearic acids;n‐butyl, isobutyl,n‐octyl, octadecyl, “tallow” and 2,2‐dimethyl‐1,3‐propanediol esters of lauric acid and tetradecyl acetate. Federal test methods for aircraft turbine lubricants were used for the evaluations. In the esters the swelling was higher with type L rubber than with type H. The lower the equivalent weight of the ester, the higher the swell with both types of rubber. Branching in the alcohol moiety lowered the swell. Deswelling (desorption) in air of the swelled samples was also investigated. Methyl myristate, methyl palmitate and the long chain laurate esters meet MIL‐L‐23699 military specifications for type H rubbers. In type L rubbers the swelling is too high to meet specifications.
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