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  • Articles  (3,950)
  • Polymer and Materials Science  (3,044)
  • Chemical Engineering  (737)
  • Physical Chemistry
  • 1985-1989  (1,548)
  • 1980-1984  (1,415)
  • 1975-1979  (987)
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  • Articles  (3,950)
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  • 1
    Electronic Resource
    Electronic Resource
    Raman spectra and normal vibrations of dipeptides. II. Glycyl-L-proline (1983)
    New York : Wiley-Blackwell
    Biopolymers 22 (1983), S. 1285-1300 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Raman and ir spectra of the glycyl-L-proline (GP) dipeptide were recorded. A normal-coordinate treatment was performed on the basis of the experimental spectra, using a modified Urey-Bradley force field (MUBFF). Cyclic redundancies were eliminated, and those due to the ring methylene groups, particularly distorted in regard to the tetrahedral conformation, were treated. An assignment of the experimental frequencies is proposed on the basis of the normal treatment.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360220504
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  • 2
    Electronic Resource
    Electronic Resource
    Phase separation by synthesis of semi-interpenetrating network on the basis of polystyrene and poly(butyl methacrylate) from homogeneous solution (1984)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 185 (1984), S. 347-351 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Phase separation by semi-interpenetrating polymeric network formation based on the copolymer styrene-divinylbenzene (PS-DVB) and poly(butyl methacrylate) (PBMA) was investigated by light scattering. The time for phase separation was measured as a function of the rate of the copolymerization reaction and of the composition of the initial blend. The time until the outset of phase separation decreases with increasing content of PBMA in the blend. The change in concentration of DVB does not influence the process of phase separation.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1984.021850211
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  • 3
    Electronic Resource
    Electronic Resource
    Isocyanate-terminated polybutadiene prepolymers: Synthesis, characterization, and end-group modifications (1988)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 36 (1988), S. 1433-1441 
    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: Telechelic prepolymers of butadiene with aliphatic isocyanate end-groups were prepared by the solution polymerization of butadiene under free radical initiation. 4,4′-Azobis (4-cyanopentanoyl azide) was used as the initiator. Liquid prepolymers were obtained with molecular weights of 1450 to 6000 and functionalities 1.9 to 2.2. The prepolymers were characterized by their number-average molecular weight, isocyanate content, functionality, infrared, and nuclear magnetic resonance spectra and microstructure. The storage stability of the prepolymers was checked and they were found to be quite stable under ambient conditions. Isocyanate-terminated polybutadienes were reacted with N,N-dimethylamino ethanol and t-butyl hydroperoxide to obtain useful dimethylamino-terminated and peroxycarbamate-terminated prepolymers, respectively.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1988.070360613
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  • 4
    Electronic Resource
    Electronic Resource
    Drag reduction by polymer-polymer mixtures (1988)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 36 (1988), S. 837-858 
    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: An extensive study on the turbulent drag reduction caused by the various mixtures of polyacrylamide, purified guargum, xanthangum, and their graft copolymers has been conducted at low concentrations and Re = 14,000 using a turbulent flow rheometer. It has been found in most of the cases that the drag reduction caused by mixtures shows a positive deviation from the linearly additive straight line. This effect is more prominent when the drag reduction caused by both the constituents differ appreciably. In most of the cases, the drag reduction caused by the mixtures is higher than the DR caused by either of the constituent polymers; however, the drag reduction caused by the mixture is less than the sum of the drag reduction caused by both the constituents at their respective concentration in the mixture. It has also been noticed that there is no evidence of synergism in these mixtures at low concentrations.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1988.070360409
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  • 5
    Electronic Resource
    Electronic Resource
    Decomposition rate studies of azobisnitriles containing functional groups (1988)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 26 (1988), S. 953-958 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1988.080260321
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  • 6
    Electronic Resource
    Electronic Resource
    Liquid-liquid flows in an inclined pipe (1988)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 34 (1988), S. 781-789 
    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: Experimental measurements are reported of oil-water flows in a 20 cm ID pipe at mean velocities between 2.7 and 35 cm/s, at deviation angles θ from vertical between 0 and 65°, and at water flow rate fractions between 30 and 100%. The distribution of the water volume fraction αw across a pipe section is obtained using local high-frequency probes. The mean water volume fraction in the section and the slip velocity Vs between oil and water are also determined. High Vs values (up to 50 cm/s) are measured at large deviation angles; they are associated with oil droplet swarms or continuous oil phase zones. Both αw profiles and Vs values depend only on the mean water volume fraction and not on the total flow rate Qt in the range investigated. At low oil volume fractions αo, all droplets are concentrated close to the upper side of the pipe. At larger αo values, a slower linear variation of αw with the distance y from the axis is measured. A model is suggested relating the slope ∂αw/∂y in a vertical plane to the existence of internal density waves in the stratified mixture.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690340508
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  • 7
    Electronic Resource
    Electronic Resource
    Corrosion fatigue behaviour of nitrogen-implanted steel in water (1980)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 31 (1980), S. 783-789 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Schwingungskorrosionsverhalten von nitriertem Stahl in WasserDas Schwingungskorrosionsverhalten von nitriertem Stahl in neutralen Lösungen wurde unter Verwendung von schwingenden, einseitig eingespannten Proben (cantilever beam method) elektrochemisch (Ekorr/Zeit, Rp-Messung) und mittels Rasterelektronenmikroskopie untersucht.Die Korrosionsgeschwindigkeit in stagnierenden Flüssigkeiten ist bei dem nitrierten Stahl, unabhängig von der Stickstoffkonzentration, niedriger als bei unbehandeltem Stahl; die an der Oberfläche entstehenden Oxidschichten besitzen deutlich bessere Schutzwirkung.Bei einer zyklischen Belastung (25,4 kg/mm-2, 16,6 Hz) ist die Rißauslösung verzögert. Die Zeit bis zum Bruch ist beträchtlich kürzer als bei nicht nitrierten Proben (zumindest unter den verwendeten Versuchsbedingungen). Die Erhöhung der Rißausbreitungsgeschwindigkeit läßt sich erklären durch die Gefügeschädigungen, die durch das Nitrieren hervorgerufen werden. Die Bruchmorphologie wird ebenfalls erörtert.
    Notes: The corrosion fatigue behaviour of nitrogen implanted iron in neutral solutions has been investigated utilizing the oscillating cantilever beam method, by means of electrochemical (Ecorr vs. time plots, Rp measurements) and S. E. M. techniques.The calculated corrosion rate under stagnant conditions is lowered for the implanted iron at all nitrogen doses with respect to untreated iron. The surface oxide layers achieve enhanced protecting capacity.Consequently under a cyclic load of 25.4 kg mm-2, at a frequency of 16.6 Hz, cracks nucleation is delayed. The time to breaking of implanted specimens is considerably lower in our experimental conditions compared to untreated iron. The increase in the crack growth rate is consistent with the detrimental action of structural damage following implantation. The fracture morphology is also discussed.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19800311006
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  • 8
    Electronic Resource
    Electronic Resource
    Extension of nichols chart for identification of open-loop unstable systems (1984)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 30 (1984), S. 684-686 
    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.690300431
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  • 9
    Electronic Resource
    Electronic Resource
    Tracer analysis in systems with two-phase flow (1979)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 25 (1979), S. 885-890 
    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: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690250518
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  • 10
    Electronic Resource
    Electronic Resource
    Optical fiber coatings: High modulus coatings for fibers with a low microbending sensitivity (1989)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 29 (1989), S. 1172-1176 
    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: An important function of an optical fiber coating is to prevent optical losses due to microbending induced by lateral forces on the fiber. To protect the fiber over a wide temperature range the modulus of the primary and the secondary coating should be low and high, respectively, and temperature independent. However, selecting the most appropriate organic coating materials introduces a new source of optical losses. Since the linear thermal expansion coefficients of silica and the organic coatings differ by about two orders of magnitude, thermal, fluctuations will cause axial stresses. Cooling may then induce bending or buckling of the glass fiber in the soft primary coating, resulting in increased transmission losses. This effect is especially pronounced when a high-modulus secondary coating is selected with a glass transition temperature above 80°C. For this type of coating the difference in radial shrinkage between the buffer and the top coating during cooling from the curing temperature becomes important. The influence of primary coating thickness is discussed.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760291706
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