Accession Number : ADA291269

Title :   Absorption of Water and Lubricating Oils Into Porous Nylon.

Corporate Author : AEROSPACE CORP EL SEGUNDO CA MECHANICS AND MATERIALS TECHNOLOGY CENTER

Personal Author(s) : Bertrand, P. A.

PDF Url : ADA291269

Report Date : 10 JAN 1995

Pagination or Media Count : 16

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

Descriptors :   *WATER, *NYLON, *ABSORPTION, *POROUS MATERIALS, *LUBRICATING OILS, AIR, MOISTURE CONTENT, SURFACES, INFILTRATION(FLUIDS), LOW LEVEL, DIFFUSION COEFFICIENT, OILS, HUMIDITY, SINTERING, STABILIZATION SYSTEMS, PHENOLIC PLASTICS, COTTON.

Subject Categories : Physical Chemistry
      Inorganic Chemistry
      Lubricants and Hydraulic Fluids
      Plastics

Distribution Statement : APPROVED FOR PUBLIC RELEASE