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  • 1
    Electronic Resource
    Electronic Resource
    A mathematical model for polymerization of isoprene with n-butyllithium in hexane (1974)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 18 (1974), S. 1805-1819 
    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: Isoprene was polymerized in batch reactors by use of bottle polymerization techniques at 30°, 40°, and 50°C at concentrations from 1 to 5 molar. Butyllithium concentration was varied from 0.005 to 0.03 molar. Isoprene and n-butyllithium conversions and molecular weight distributions were determined for different reaction times. Rate equations for the initiation and propagation reactions are presented. The importance of the association reactions in obtaining a narrow molecular weight distribution is illustrated.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1974.070180618
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  • 2
    Electronic Resource
    Electronic Resource
    Irregularities in steady flow for non-newtonian fluids between cone and plate (1979)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 23 (1979), S. 953-965 
    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: Flow irregularities have been visually observed in solutions of polyacrylamide of high molecular weight on shear in a cone-and-plate rheometry (gap angle 2.3°). This anomalous flow was found to depend on molecular weight, concentration, and solvent. The onset of flow irregularities were generally at shear rates 〈 5 sec-1. A dimensional analysis shows that the elastic component of the fluid is responsible for the anomalous flow. The onset of flow irregularities has been predicted from measurements of recoverable strain as a function of shear stress.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1979.070230401
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  • 3
    Electronic Resource
    Electronic Resource
    The preparation and tensile properties of polyethylene composites (1978)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 22 (1978), S. 3249-3265 
    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: Single polymer composites have been prepared using different morphologies of polyethylene as matrix and as the reinforcement. Depending on annealing conditions, the ultraoriented fibers used as reinforcement can have higher melting points (ca. 139°C) than the matrix made from the same conventionally crystallized high-density polyethylene (ca. 132°C) or from low-density polyethylene (ca. 110°C). The optimum temperature has been assessed for bonding to occur by growth of transcrystalline regions from the melt matrix without considerable modulus reduction of the annealed ultraoriented and reinforcement fiber or film. Pullout tests have been used for determining the interfacial shear strength of these single polymer composites. The interfacial shear strength for the high-density polyethylene films embedded in a low-density polyethylene matrix is 7.5 MPa and for high-density polyethylene self-composites is 17 MPa. These values are greater than the strength for glass-reinforced resins. The strength is mainly due to the unique epitaxial bonding which gives greater adhesion than the compressive and radial stresses arising from the differential shrinkage of matrix and reinforcement. The tensile modulus of composites prepared from uniaxial and continuous high-density polyethylene films embedded in low-density polyethylene obeys the simple law of mixtures and the reinforced low-density polyethylene modulus is increased by a factor of 10. High strength cross-ply high-density-polyethylene - low-density-polyethylene laminates have also been prepared and the mechanical properties have been studied as the film orientation is varied with respect to the tensile axis.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1978.070221119
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  • 4
    Electronic Resource
    Electronic Resource
    Absorption and desorption accompanied by a reversible reaction (1971)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 17 (1971), S. 536-541 
    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: The processes of absorption and desorption with reversible reaction are compared theoretically for reactions of the type A ⇌ nB. With the same concentration difference between bulk and interface, it is found that in general, the rate of desorption is lower than that of absorption. Under certain conditions the difference may be as much as 35%.The analysis is based on the penetration theory. The numerical solution introduces a new transformation of the time and distance variables (based on the error function) which reduces the computing time required. An analytical examination of the penetration theory equations provides an explanation of the results of the numerical solution.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690170311
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  • 5
    Electronic Resource
    Electronic Resource
    Mathematical methods in chemical engineering, vol II. First order partial differential equations with applications, Rutherford Aris and Neal R. Amundson, Prentice Hall, Englewood Cliffs, N. J. (1973). 369 pages. $16.50 (1973)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 19 (1973), S. 880-880 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690190444
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  • 6
    Electronic Resource
    Electronic Resource
    Unique polyethylene morphologies produced under extrusion conditions (1972)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 162 (1972), S. 19-30 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es wurde gezeigt, daß sich in Hochdruck-Polyäthylen in der Nähe der Schmelztemperatur und unter bestimmten Bedingungen in bezug auf Orientierung und Druck, wie sie im Instron-Extrusions-Kapillar-Rheometer vorliegen, ungewöhnliche morphologische Strukturen ausbilden. Die bemerkenswert hohe optische Transparenz und die Spannungsmoduln der in diesen Fäden vorliegenden morphologischen Gebilde waren Gegenstände der Untersuchungen. Einzelheiten des Kristallisationsverfahrens werden beschrieben. Die morphologischen Strukturen, die sich bei dem „Instron-Verfahren“ herausbilden, wurden mit Hilfe von röntgenographischen, kalorimetrischen, mikroskopischen und mechanischen Messungen untersucht. Die transparenten Fasern setzen sich aus einer großen Zahl von Mikrofibrillen, die einen hohen kristallinen Orientierungsgrad parallel zur Kapillarachse bestizen, zusammen. Elektronenbeugung und kalorimetrische Untersuchungen zeigen, daß ein Teil der Fasern einen ungewöhnlich hohen Ordnungsgrad besitzt. Es werden Strukturmodelle für die Fasern vorgeschlagen.
    Notes: Unusual morphologies have been shown to be produced in high density polyethylene near its melting point and under selective conditions of orientation and pressure existing in an Instron capillary extrusion rheometer. Points of study involve the remarkably high optical clarity and tensile moduli for the morphologies produced in these filaments. Details of the crystallization procedure are provided. The morphologies resulting from the Instron procedure have been analyzed by several different techniques. X-ray, calorimetry, microscopy and modulus data are discussed. The transparent filaments are composed of a large number of microfibers having a high degree of crystalline orientation parallel to the capillary axis. Electron diffraction and calorimetric studies indicate that a portion of the strands have an unusually high degree of order. Structural models for the strands are also proposed.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1972.021620103
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  • 7
    Electronic Resource
    Electronic Resource
    Antimetaboliten des Coenzyms Q. Möglichkeiten ihrer Anwendung als Antimalaria-Mittel (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 86 (1974), S. 635-645 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Malaria wird auf den Menschen durch den Stich der Anopheles-Mücke übertragen; der Mensch fungiert als Zwischenwirt und die Mücke als Endwirt für die Plasmodien. Gegen einige Chemotherapeutica sind die Plasmodien resistent geworden. Ein neues Konzept der Malaria-Therapie geht davon aus, daß der Elektronentransport im Stoffwechsel der Plasmodien durch Antimetaboliten des Coenzyms Q gehemmt wird, das am Elektronentransport maßgeblich beteiligt ist. Als Coenzym Q bezeichnet man 2.3-Dimethoxy-5-methyl-1,4-benzochinone mit isoprenoiden Ketten wechselnder Länge an C-6. In diesem Fortschrittsbericht wird eine Reihe synthetischer Antimetaboliten vorgestellt und ihre Wirkung in vorläufigen pharmakologischen Tests diskutiert.
    Additional Material: 8 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19740861705
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  • 8
    Electronic Resource
    Electronic Resource
    Einfluß von Verschiebungsreagentien auf NMR-Kopplungskonstanten (1978)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 90 (1978), S. 51-52 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19780900112
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  • 9
    Electronic Resource
    Electronic Resource
    Strukturuntersuchungen an Immunglobulinen (Nobel-Vortrag)Copyright © The Nobel Foundation 1973. - Wir danken der Nobel-Stiftung, Stockholm, für die Genehmigung zum Druck dieser Übersetzung. (1973)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 85 (1973), S. 1097-1101 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19730852405
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  • 10
    Electronic Resource
    Electronic Resource
    Viscoelastic properties of linear chain macromolecular gels. Growth of stress at the onset of steady shear flow (1979)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 76 (1979), S. 191-208 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Das Anwachsen von Zugspannung und Scherung zu Beginn einer konstanten Scherung wurde an Lösungen linearer Makromoleküle untersucht, um Aussagen über nichtlineare Viskoelastizität zu machen. Die Polyacrylamide (PAAm)…wurden in Wasser, Formamid und Ethylenglycol gelöst. Die Polymeren wurden in diesem Labor hergestellt. Sie waren unverzweight und initiatorfrei. Die Polystyrolproben (PS) von der Pressure Chemical Company wurden in Dekalinlösung untersucht. PAAm zeigt mit steigendem Molekulargewicht und steigender Konzetration zunehmend typischen Gelcharaketer in allen drei Lösungsmitteln. für homogene Systeme wurde Gelbruch und ein „undershoot“ beob-achtet. Zum ersten Ma1 konnten „overshoot“ aufgrund von verhakten Ketten und auf-grund von energetisch assoziierten Ketten voneinander unterschieden werden. Dies Ver-halten zeigt einen grol3en Gegensatz gegenuber dem PS/Dekalin-System und zeigt die Starke der Nebenvalenzbindungen in den PAAm-Systemen.
    Notes: The growth of stress (shear stress and normal stress) at the onset of steady shear flow was investigated for linear chain macromolecular fluids to determine nonlinear viscoelasticity. The polyacrylamides (PAAm) were dissolved in H2O, formamide and ethyleneglycol. The polymers were prepared in this laboratory. They were unbranched and free of initiator. The polystyrene (PS) samples from Pressure Chemical Company were studied in decalin solutions. PAAm shows increasingly typical gel character - in all 3 solvents - with increasing molecular weight and polymer concentration. For homogeneous systems gel fracture and undershoot were observed. Further for the first time overshoot due to entangled molecules and overshoot due to energetically associated chains have been distinguished. This behaviour is a strong contrast to the PS/decalin system and demonstrates the strength of the second valence bondings in the PAAm-systems.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1979.050760111
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