Absorption of Water and Lubricating Oils Into Porous Nylon.
AEROSPACE CORP EL SEGUNDO CA MECHANICS AND MATERIALS TECHNOLOGY CENTER
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Oil and water absorption from an into sintered porous nylon can be described by infiltration into the pores of the material. This process can be modeled by a diffusion-like mechanism. For water absorption, we find formal diffusion coefficient of 1.5 x 10exp-4 sq cmmin when the nylon is initially dry. The diffusion coefficient is 4 x 10exp-6 sq cmmin when the nylon is oil-impregnated prior to an exposure. In a 52 RH atmosphere, dry nylon absorbs 3 ww water, and oil-impregnated nylon absorbs 0.6 ww water. For oil absorption there are three steps 1 surface absorption and infiltration into 2 larger and 3 smaller pores. Surface absorption is too fast to be measured in these experiments. The diffusion coefficient for the second step is 6 x 10-4 sq cmmin for SRG-60 oil into dry nylon and 4 x 10-4 sq cmmin for air-equilibrated nylon. The diffusion coefficient for the third step is about 1 x 10-6 sq cmmin for both cases. The total amount of oil absorbed is 31 ww. The interaction between water and nylon is not as strong as that between water and cotton-phenolic oil can replace water, and only a small amount of water can enter previously oil-impregnated nylon. jg
- Physical Chemistry
- Inorganic Chemistry
- Lubricants and Hydraulic Fluids