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  • Polymer and Materials Science  (15)
  • AERODYNAMICS  (1)
  • Temperatur  (1)
  • INSTRUMENTATION AND PHOTOGRAPHY
  • 1980-1984
  • 1945-1949  (17)
  • 1948  (17)
Collection
Keywords
Publisher
Years
  • 1980-1984
  • 1945-1949  (17)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Polymeric amides from omega-amino acidsContribution No. 225 from the Chemical Department, Experimental Station, E. I. du Pont de Nemours & Co., Inc., Wilmington, Delaware. (1948)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 3 (1948), S. 85-95 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Methods for the preparation of fiber-forming polymeric amides from ω-amino acids and The variation in melting points of the polymeric their amide-forming derivatives are described. The variation in melting points of the polymeric amides with increasing chain length of the recurring unit is discussed.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1948.120030110
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  • 2
    Electronic Resource
    Electronic Resource
    Surface tension of polyoxyethylene glycol solutions (1948)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 3 (1948), S. 345-349 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The surface tension of polyoxyethylene glycol in water leads to a value for the area per molecule which shows that the polymer molecules lie approximately flat in the surface. Molecular weight determinations by end-group analysis and freezing-point depression are compared with values of the intrinsic viscosity and limiting area per molecule.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1948.120030306
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  • 3
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    Experimental investigation of the aerodynamic effects of distributed spanwise blowing on a fighter configuration (1948)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The results of wind tunnel tests at NASA Langley targeted at the performance and configurational characteristics of 0.1 and 0.13 scale model spanwise blowing (SWB) jet wing concepts are reported. The concept involves redirection of engine compressor bleed air to provide SWB at the fuselage-wing juncture near the wing leading edge. The tests covered the orientation of the outer panel nozzles, the effects of SWB operation on the performance of leading and trailing edge flaps and the effects of SWB on lateral stability. The trials were run at low speeds and angles of attack from 24-45 deg (landing). Both lift and longitudinal stability improved with the SWB, stall and leading edge vortex breakdown were delayed and performance increased with the SWB rate. Lateral stability was degraded below 20 deg angle of attack while instabilities were delayed above 20 deg due to roll damping.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 84-2195
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
    Electronic Resource
    Electronic Resource
    Free energy, heat, and entropy changes accompanying the sorption of water vapor by proteinsContribution from the Institute of Polymer Research, Polytechnic Institute of Brooklyn. (1948)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 3 (1948), S. 16-21 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Recently published measurements of moisture sorption vs. relative humidity for a series of proteins have previously been analyzed in a way which permits calculation of the integral free energy of sorption for any final pressure of water vapor. The present paper is an extension of these calculations to additional proteins from the list reported by Bull; integral and differential free energies and integral and differential heats and entropies of sorption have been calculated as functions of the amounts of water sorbed onsilk, wool, egg albumin (unlyophilized and heat coagulated), salmine, collagen, gelatin and lactoglobulin (crystalline and lyophilized). All calculations are referred to saturated water vapor as the standard state. Some of the proteins show positive net differential entropies of sorption at low vapor pressures. It is postulated that the partial molal entropy of sorption is made up of two terms, a negative entropy of sorption proper and a positive entropy of solution. Partial rearrangements of the protein chains at the beginning of the sorption process would effectively be an incipient solution which would give rise to a positive partial molal entropy of sorption if the second term is greater than the first. This speculation has support in the fact that the differential entropy of salmine, which dissolves at a relative vapor pressure of about 0.7, begins to show positive values at a relative vapor pressure of 0.35.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1948.120030103
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  • 5
    Electronic Resource
    Electronic Resource
    Deformation mechanism of cellulose gels. IV.Communication No. 49 from the Laboratory for Cellulose Research, Utrecht. General relationship between orientation of the crystalline and that of the amorphous portion (1948)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 3 (1948), S. 1-9 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Ten series of model filaments with increasing orientation and swelling degrees ranging between 16 and 1.2 were prepared from three viscoses containing 4, 6, and 10.5% cellulose. Their birefringence was measured and their x-ray diagrams taken and quantitatively evaluated in order to determine the over-all orientation of the iiber substance and that of the crystalline portion. It is shown that a general relation exists between the orientation of the crystallites and that of the entire fiber substance which is the same in all fibers stretched in the swollen state. Once the birefringence of a filament is known, the orientation factor of its crystallitee can be computed without taking an x-ray photograph. From the data further evidence can be derived to the effect that the orientation of the crystallitm cannot be accounted for by the theory of affined deformation.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1948.120030101
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  • 6
    Electronic Resource
    Electronic Resource
    Photochemistry of proteins. IV. Action of ultraviolet light on crystalline chymotrypsin (1948)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 3 (1948), S. 223-226 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Crystalline chymotrypsin has been inactivated by ultraviolet light (2537 Å.) with a quantum yield of 0.0032 based upon loss of ability to act upon casein as a substrate. The possible significance of this datum in terms of the duo-specificity of chymotrypsin, the integrity of the molecule as a whole and the quantum efficiency of cleavage of —CONH— linkages is discussed. The ultraviolet light absorption spectrum of the pure enzyme has been determined.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1948.120030208
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  • 7
    Electronic Resource
    Electronic Resource
    Polymerization of allyl compounds. IV. Emulsion polymerization of allyl acetate (1948)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 3 (1948), S. 216-222 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The emulsion polymerization of allyl acetate yields a polymer of the same average molecular weight as is obtained in bulk polymerization. The decomposition of potassimn persulfate is of the first order but is greatly accelerated by the presence of allyl acetate or of ethyl acetate. Three independent methods of analysis agree in indicating the presence of sulfate groups in 75% of the polymer molecules. It is concluded that the mechanisms of chain initiation and termination are analogous to those in the peroxide-induced bulk polymerization of allyl acetate. These facts do not serve to distinguish between different postulated loci reaction in emulsion polymerization.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1948.120030207
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  • 8
    Electronic Resource
    Electronic Resource
    Adhesion of high polymers to cellulose. Influence of structure, polarity, and tack temperature (1948)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 3 (1948), S. 652-662 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: It has been demonstrated that the adhesion of high polymers to cellulose is a function of tack temperatures and dielectric constants, ∊, of the polymers and of dipole moments, μ, of polar groups. A plot of tack temperature versus mirror image force, μ1μ2/,of copolymers gives an area of adhesion bounded by a tack temperature of 100% and mirror image forces of 0.7 and 1.3 and opening toward lower tack temperatures. Outside of the area polymers do not adhere well to cellulose. By coating polymers on cellulose pretreated with Werner chromium complexes of acids bearing polar groups, it has been found that adhesion is a specific function of the polar groups within the polymer and on the modilied cellulose. Adhesion is strongest with approximately equal dipole moment substituents on the modified cellulose and in the copolymers.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1948.120030507
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  • 9
    Electronic Resource
    Electronic Resource
    Elastoviscous properties of polyisobutylene. I. Relaxation of stress in whole polymer of different molecular weights at elevated temperaturesPresented before the Division of High-Polymer Physics, American Physical Society, Chicago, Ill., December 29, 1947. (1948)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 3 (1948), S. 669-692 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The relaxation of stress in polyisobutylene whole polymer of different average molecular weights has been investigated over the temperature range 30-100°C., and at different elongations. The shape of the relaxation curve is independent of elongation in a range of low elongations; above this range there is a gradual change in curve shape with increasing elongation. The shape of the relaxation curve for a given molecular weight is the same at different temperatures, when plotted as reduced stress vs. logarithmic time; a change in temperature essentially shifts the position of the curve along the logarithmic time scale. The activation energy for relaxation, calculated by use of the Arrhenius equation, is found to be independent of molecular weight in the molecular weight range investigated (M̄v = 665,00.0 to 1,420,000), the average value being 15.4 kcal. Straight lines are obtained when reciprocal viscosity-average molecular weight is plotted against log time required for the reduced stress to reach a certain arbitrary value, at a fixed temperature and elongation. Relaxation rate depends on molecular weight with sufficient sensitivity so that relaxation measurements may be a practical method of measuring molecular weight directly in the solid state.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1948.120030509
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  • 10
    Electronic Resource
    Electronic Resource
    Concentration dependence of the viscosity of sodium pectinate in solutions NaCl (1948)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 3 (1948), S. 897-898 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1948.120030611
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