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There are a total of 33 record(s) matching your query.
Sorted by: Date Added To NTRS in Descending order
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PMR-15 polyimide modifications for improved prepreg tack
Author(s): Vannucci, R. D.
Abstract: The use of mixed solvents and of modified monomeric ester reactants was investigated as a means of improving the tack and drape retention characteristics of PMR-15 polyimide prepreg. Methanol, ethanol, 1-propanol and ...
NASA Center: Glenn Research Center
Publication Year: 1982
Added to NTRS: 2007-03-06
Accession Number: 83N12175; Document ID: 19830003905; Report Number: E-1361, NAS 1.15:82951, NASA-TM-82951
Properties of autoclaved Gr/PI composites made from improved tack PMR-15 prepreg
Author(s): Vannucci, R. D.
Abstract: Autoclave processing studies were conducted, using improved tack PMR-15 prepreg, to determine the effect of tack enhancing PMR resin modifications on composite processability and mechanical properties. Improved tack graphite ...
NASA Center: Glenn Research Center
Publication Year: 1985
Added to NTRS: 2007-03-05
Accession Number: 86N11276; Document ID: 19860001809
Tailor making high performance graphite fiber reinforced PMR polyimides
Author(s): Serafini, T. T.; Vannucci, R. D.
Abstract: Studies performed to demonstrate the feasibility of using the polymerization of monomer reactants (PMR) approach to tailor make processable polyimide matrix resins are described. Monomeric reactant solutions containing the ...
NASA Center: Glenn Research Center
Publication Year: 1974
Added to NTRS: 2005-10-13
Accession Number: 74N34960; Document ID: 19740026847; Report Number: E-8126, NASA-TM-X-71616
Lower-curing-temperature PMR polyimides
Author(s): Serafini, T. T.; Delvigs, P.; Vannucci, R. D.
Abstract: Studies were performed to achieve a lower-curing-temperature PMR polyimide. The use of m-aminostyrene as the end-cap instead of the monoalkyl ester of 5-normbornene-2,3 dicarboxylic acid was investigated in typical PMR ...
NASA Center: Glenn Research Center
Publication Year: 1981
Added to NTRS: 2005-10-13
Accession Number: 81N17174; Document ID: 19810008654; Report Number: E-734, NASA-TM-81705
Tailor making high performance graphite fiber reinforced PMR polyimides
Author(s): Serafini, T. T.; Vannucci, R. D.
Abstract: Studies have demonstrated versatility of PMR approach for tailor making polyimide matrix resins with side range of flow characteristics. By simply adjusting molar ratio of reactants in monomer mixture, resins having flow ...
NASA Center: Glenn Research Center
Publication Year: 1975
Added to NTRS: 2005-09-30
Accession Number: 75B10137; Document ID: 19750000137; Report Number: LEW-12416
Technique for the polymerization of monomers for PPQ/graphite fiber composites
Author(s): Serafini, T. T.; Delvigs, P.; Vannucci, R. D.
Abstract: Impregnation of fiber prior to appreciable polymerization completely eliminates impregnation problems encountered with use of high viscosity high molecular weight polyphenylquinoxalines (PPQ) solutions. Major part of ...
NASA Center: Glenn Research Center
Publication Year: 1973
Added to NTRS: 2005-09-30
Accession Number: 73B10014; Document ID: 19730000014; Report Number: LEW-11879
Improved PMR Polyimides For Heat-Stable Laminates
Author(s): Vannucci, R. D.; Malarik, D. C.; Papadapoulos, D. S.; Waters, John F.
Abstract: Second-generation PMR-type polyimides (PMR-II polyimides) of enhanced thermo-oxidative stability prepared by substitution of para-aminostyrene (PAS) end caps for nadic-ester (NE) end caps used in prior PMR-II polyimides. ...
NASA Center: Glenn Research Center
Publication Year: 1994
Added to NTRS: 2005-09-30
Accession Number: 94B10191; Document ID: 19940000191; Report Number: LEW-15303
Second-generation PMR polyimides
Author(s): Serafini, T. T.; Vannucci, R. D.; Alston, W. B.
Abstract: Continuing research has resulted in development of polyimides with improved thermo-oxidative stability at 589 K. Polyimides are based on dimethyl ester of 4,4'-(hexafluoro-isopropylidene)-bis(phthalic acid) (HFDE) and ...
NASA Center: Glenn Research Center
Publication Year: 1977
Added to NTRS: 2005-09-30
Accession Number: 76B10359; Document ID: 19760000359; Report Number: LEW-12738
Autoclavable addition polyimides for 371 C composite applications
Author(s): Vannucci, R. D.; Malarik, D. C.; Papadapoulos, D. S.; Waters, J. F.
Abstract: Studies were conducted to improve the thermo-oxidative stability (TOS) of PMR type polyimides by the substitution of para-aminostyrene (PAS) for the nadic ester endcap in second generation PMR polyimides (PMR-2). The nadic ...
NASA Center: Glenn Research Center
Publication Year: 1990
Added to NTRS: 2005-08-25
Accession Number: 90N27874; Document ID: 19900018558; Report Number: E-5613, NAS 1.15:103233, NASA-TM-103233
Effect of processing parameters on autoclaved PMR polyimide composites
Author(s): Vannucci, R. D.
Abstract: A study was conducted to determine the effect of processing parameters on the processability and properties of autoclaved fiber reinforced PMR polyimide composites. Composites were fabricated from commercially available ...
NASA Center: Glenn Research Center
Publication Year: 1977
Added to NTRS: 2004-11-03
Accession Number: 77N32248; Document ID: 19770025304; Report Number: E-9240, NASA-TM-73701
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