Absorption of Water and Lubricating Oils Into Porous Nylon.
Abstract
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 10(exp-4) sq cm/min when the nylon is initially dry. The diffusion coefficient is 4 x 10(exp-6) sq cm/min when the nylon is oil-impregnated prior to an exposure. In a 52% RH atmosphere, dry nylon absorbs 3% w/w water, and oil-impregnated nylon absorbs 0.6% w/w 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 cm/min for SRG-60 oil into dry nylon and 4 x 10(-4) sq cm/min for air-equilibrated nylon. The diffusion coefficient for the third step is about 1 x 10(-6) sq cm/min for both cases. The total amount of oil absorbed is 31% w/w. 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
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 10, 1995
- Accession Number
- ADA291269
Entities
People
- P. A. Bertrand
Organizations
- The Aerospace Corporation