Accession Number : ADD017355

Title :   Process for Producing Hydrophilic Polymer Membranes.

Descriptive Note : Patent Filed 28 Sep 93, patented 18 Oct 94,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Howell, Barbara F ; Venkatachalam, Ravanasamudram S ; Wehrle, John P

Report Date : 18 Oct 1994

Pagination or Media Count : 5

Abstract : Hydrophilicity of hydrophilic polymers, in the form of heat-crosslinked coatings on porous membranes, is increased by exposure to an oxygen plasma, preferable for about 60 seconds. The plasma is generated at an oxygen gas pressure of about 1.5 Torrs in a chamber subjected to radio frequency electromagnetic radiation with a power of 25-100 watts. Such highly hydrophilic membranes have increased efficiency and durability when used as ultrafiltration membranes for separating hydrophobic and hydrophilic materials, such as smoke-air and oil-water mixtures. (AN)

Descriptors :   *POLYMERS, *CROSSLINKING(CHEMISTRY), *PATENTS, SOLUTIONS(MIXTURES), WATER, PLASMAS(PHYSICS), NYLON, SYNTHESIS(CHEMISTRY), HEAT TREATMENT, OXYGEN, COATINGS, ELECTROMAGNETIC RADIATION, METHACRYLATES, MEMBRANES, OILS, POLYURETHANE RESINS, POLYCARBONATES, POROUS MATERIALS, HYDROPHOBIC PROPERTIES, SULFONIC ACIDS, ETHANOLS, ULTRAFILTRATION, HYDROPHILIA, POLYACRYLATES

Subject Categories : Polymer Chemistry
      Industrial Chemistry and Chemical Processing

Distribution Statement : APPROVED FOR PUBLIC RELEASE