Engineering topics

Proctor, K. Mason

Publications and source records attributed to Proctor, K. Mason.

5 records

NASA NTRS1994

Low-Dielectric-Constant Polyimide Fibers

In experiments performed at NASA Langley Research Center, low-dielectric-constant polyimide fibers produced by use of resin extrusion. These fibers also have high thermal stability and good tensile properties. Useful in industrial and aerospace applications in which fibers required to have dielectric constants less than 3, high thermal stability, and tensile properties in range of those of standard textile fibers. Potential applications include use in printed circuit-boards and in aircraft composites.

Dorogy, William E., Jr.↗

NASA NTRS1994

Low-Dielectric-Constant Polyimide/Glass Composites

Advance in polymer technology yields composites having relatively low dielectric constants. Reduction achieved by reducing interactions between linear polyimide chains and by incorporation of fluorine into polymer backbones. Further reductions obtained by physically incorporating selected diamic acid additives into polyimides. Strong potential for use in microelectronics industry for fabrication of printed-circuit boards and fabrication of components for military aircraft.

Stoakley, Diane M.↗

NASA NTRS1991

Tough, High-Performance, Thermoplastic Addition Polymers

Series of addition-type thermoplastics (ATT's) exhibit useful properties. Because of their addition curing and linear structure, ATT polymers have toughness, like thermoplastics, and easily processed, like thermosets. Work undertaken to develop chemical reaction forming stable aromatic rings in backbone of ATT polymer, combining high-temperature performance and thermo-oxidative stability with toughness and easy processibility, and minimizing or eliminating necessity for tradeoffs among properties often observed in conventional polymer syntheses.

Pater, Ruth H.↗

NASA NTRS1988

Processable Aromatic Polyimide Thermoplastic Blends

Method developed for preparing readily-processable thermoplastic polyimides by blending linear, high-molecular-weight, polyimic acid solutions in ether solvents with ultrafine, semicrystalline, thermoplastic polyimide powders. Slurries formed used to make prepregs. Consolidation of prepregs into finsihed composites characterized by excellent melt flow during processing. Applied to film, fiber, fabric, metal, polymer, or composite surfaces. Used to make various stable slurries from which prepregs prepared.

Baucom, Robert M↗

NASA NTRS1987

Copolyimides With Flexibilizing Groups

Copolymers improved flexibility, processability and melt-flow characteristics. Copolyimide of new type exhibits synergistic improvements in flow properties due to flexibilized diamine-derived units incorported into polymer backbone. Technique produces copolyimides with combination of flexible linkage that cause polymers to exhibit flow properties particularly well suited for use in wide range of products including adhesives, molding resins, laminating resins, dielectric and protective coatings. Improved properties make copolymers especially useful as thermoplastic hot-melt adhesives.

St. Clair, Terry L.↗