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  • Chemistry  (105)
  • Wiley-Blackwell  (105)
  • Institute of Physics
  • 1965-1969  (105)
  • 1
    Electronic Resource
    Electronic Resource
    On a tracer method for evaluating catalytic data (1967)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 13 (1967), S. 657-662 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: This paper presents theoretical studies of a method of using a radioactive tracer technique to evaluate the kinetic data of heterogeneous catalytic reactions that are coupled with a Knudsen type of pore diffusion. By superimposing a transient radioactive tracer response over the steady state concentration profile in the catalyst particle, one can establish an implicit relation between the total amount of radioactive components diffused out of the particle and the kinetic data of the reaction system. This relation can then be used to evaluate kinetic data of the reaction system. A detailed study of general monomolecular complex systems is given. Use of the method for nonlinear systems is also included.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690130413
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  • 2
    Electronic Resource
    Electronic Resource
    On thermal boundary layer growth on continuous moving belts (1967)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 13 (1967), S. 1210-1211 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690130634
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  • 3
    Electronic Resource
    Electronic Resource
    Silane polymers of diols (1965)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 9 (1965), S. 295-311 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: In an effort to develop new and improved polymeric materials for space application, a new series of polymers has been prepared. Some of these have shown outstanding thermal stability and good stability when exposed to ultraviolet radiation in a vacuum environment. High molecular weight polymers of the general type, have been prepared by the reaction of a silyldiamine with various organic diols. Bis-(anilino)diphenylsilane has been reacted with such diols as hydroquinone, resorcinol, p,p′-biphenol, 2,7-naphthalenediol, 2,2-propane-bis(4-hydroxybenzene), 1,6-hexanediol, and 4,4′-dihydroxydiphenyl ether. Of these, the polymer containing the biphenyl linkage, polydiphenylsiloxybiphenyl, has the more desirable properties. Polydiphenylsiloxybiphenyl is stable to 600°C. for short periods of time. Fibers with fairly good tenacity, 0.5 g./den. may be drawn directly and continuously from the polymer melt. This polymer forms a hard protective coating on aluminum, remains stable after being heated at 500°C. for 60 min., and shows no change after 96 hr. at 270°C. (518°F.). It also forms good transparent semiflexible films and has good tensile strength as an ambient temperature adhesive.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1965.070090126
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  • 4
    Electronic Resource
    Electronic Resource
    Porous plastic prostheses (1967)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 1 (1967), S. 253-261 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: Porous laminates prepared by incorporating a volatile solvent into an epoxy resin system used to impregnate a fabric filler satisfactorily alleviated the problems caused by perspiration in upper extremity prostheses, but did not have sufficient strength for use in artificial legs. A new technique is described which results in a 100% increase in both porosity and strength of porous epoxy laminates. The method consists of impregnation of the fabric with resin and solvent and evaporation of the solvent prior to laying up the laminate. The improvement in properties is ascribed to better control and homogeneity of impregnation.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820010206
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  • 5
    Electronic Resource
    Electronic Resource
    Fundamentals of melt rheology, heat generation, and heat transfer as applied to polymer processing (1966)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 6 (1966), S. 158-168 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The flow of polymer melts is normally laminar, but pseudoplastic in character. That is, flow rate increases in proportion to a power higher then 1, usually between 1.5 and 4, of the applied pressure difference. Viscosities are extremely high - more then a mollion times that of water - so considerable heat is generated in the flowing melt by viscous dissipation of flow energy. This mode of heat generation is put to good practial use in the screw extruder, a device that converts plastic pellets into hot melt for shaping into pipe, sheets, coatings and molded products. Equations are given for computing flow rates and viscous dissipation rates. Heating (except by viscous working) and cooling of polymers are slow processes because all these materials are poor heat conducts nad their extreme viscosities make convection impracticable. The princliples of heat transfer are reviewed, and the solutions are given for some transient-conduction problems frequenlty encountered in processing. Equations are given for judging the operation of extruders.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760060213
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  • 6
    Electronic Resource
    Electronic Resource
    Milling behavior of gum elastomers: Experiment and theoryContribution No. 253 from the Research Center of the United States Rubber Company, Wayne, New Jersey. (1966)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 10 (1966), S. 1011-1026 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: When an uncompounded elastomer is processed on a two-roll mill, four different regions of mechanical behavior are observed, depending upon the temperature and the severity of the nip deformation. this behavior is observed on materials with a wide variety in chemical composition, through the severity varies. The flow at high temperatures is typical of melt or polymer solution behavior. At lower temperatures unstable flow and elastic solidike regions are observed. By presuming the elastomer to be an isotropicviscoelastic medium, the stress and velocity fields were computed in the polymer melt region. The unstable regime was found to correspond to a critical value of the ratio of viscoelastic to viscous forces. The mathematical analysis, done interms of the Green-Rivlin-Noll theory of viscoelastic media, extends earlier studies of deformation in this geometry by Gaskell and Bergen.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1966.070100705
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  • 7
    Electronic Resource
    Electronic Resource
    Poly(ethylene terephthalate). I. Study of crystallization kinetics (1965)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 9 (1965), S. 3605-3616 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Cast amorphous one mil films of poly(ethylene terephthalate)were allowed to crystallize isothermally in silicone oil over the temperature range 25-240°C. The crystallization paths were followed by recording the percent of transmission of 4000 A. light through the films as a function of time at specific temperatures. At temperatures between 70 and 90°C. the transmission increased to a value higher than the initial transmission and did not decrease with time. From about 95 to 125°C. the curves showed a similar increase, followed by a decrease to a minimum and then an increase to a new maximum before leveling off. The shapes of these curves were interpreted in terms of the sizes of the growing spherulites. The first detectable signs of crystallization were observed at 96.5°C., as evidenced by density and densitometer measurements. It is shown that the polymer passed through a temperature range beginning at the glass transition point (66°C.) and extending to about 95°C., where molecular and chain rearrangements occurred without crystallization. Half lives and rate constants were found to increase exponentially over the range 96.5-119.5°C. Above approximately 125°C., the crystallization process took place at such a rapid rate that accurate data were impossible to obtain. Activation energies were calculated from the rate constants and from an estimation of induction times from the light transmission-time curves. These values were found to be 37 and 30 kcal./mole, respectively. The density-time data were also fitted to the Avrami relationship. Evaluation of the constants indicated that the initial crystallization growth was lineal.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1965.070091110
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  • 8
    Electronic Resource
    Electronic Resource
    Dynamic mechanical properties of poly(vinyl alkyl ethers)Presented at the 11th Canadian High Polymer Forum, Windsor, Ontario, Sept. 7, 1962. (1965)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 9 (1965), S. 3471-3487 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The temperature dependence of the dynamic mechanical properties of dicumyl peroxide/sulfur vulcanizates of seven members of the poly(vinyl alkyl ether) series of elastomers has been determined. The relative position of the curves, relating the dynamic resilience to the dynamic modulus of these polymers, was generally in the order of their glass transformation temperatures (Tg). The dynamic mechanical property data on poly(vinyl n-pentyl ether) and poly(vinyl 2-ethylhexyl ether), which have the same Tg, fall on a common curve characteristic of the temperature of measurement. The dynamic resilience versus dynamic modulus curves are displaced towards higher dynamic resilience and usually lower dynamic modulus values as the temperature of measurement is increased. Poly(vinyl isobutyl ether) and poly(vinyl ethyl ether) show a larger temperature coefficient of resilience than do the other poly(vinyl alkyl ethers), which also include the n-butyl, n-hexyl, and n-octyl members. Apparently, the Tg is a major factor in correlating the dynamic mechanical behavior of this homologous series of elastomers. The size and shape of the alkyl group appear to be reflected primarily in their effect on the Tg. Poly(vinyl isobutyl ether) was the only member of the series showing any anomalies in dynamic mechanical properties that might be ascribed to structure. Because the dynamic resilience of various poly(vinyl alkyl ether) vulcanizates, possessing the same concentration of chemical crosslinks, correlate better with their degree of polymerization than with their molecular weight it appears that the dynamic resilience depends more on the length of the free chain ends than it does on their mass or volume.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1965.070091024
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  • 9
    Electronic Resource
    Electronic Resource
    Hyperfiltration studies. III. Effect of certain metal ions on the salt filtration properties of cellophanesPrevious paper see Kraus et al.1 (1966)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 10 (1966), S. 969-979 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The salt rejection properties of cellophanes are substantially increased, and permeation rates decreased, by pretreatment with certain metal ions or presence of these ions at low concentration in feed solutions. In a typical case, a cellophane which initially rejected about 20% of salt from a 0.05M NaCl solution rejected over 70% in Presence of 10-3M ThCl4. Permeation rates were decreased, usually be a factior of 2 or 3. Additives found to have a marked effect were Fe(III), Th(IV), U(VI), Cu(II), and hydrolyzed pb(II). Mg(II), Ba(II), La(III), and unhdrolyzed Pb(II) had little effect. The mechanism by which the additives affect the cellophane is not clear.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1966.070100702
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  • 10
    Electronic Resource
    Electronic Resource
    Analysis of bisphenol A sulfonate-carboxylate polymer (1968)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 12 (1968), S. 2039-2045 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The method of analysis for a polycondensation polymer containing the carboxylate and sulfonate functional groups has been devised. A combination of infrared spectroscopy and combustion analysis provides a simple and accurate determination of the monomeric units and their molar distribution in the polymer.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1968.070120906
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