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  • Chemistry  (4)
  • INSTRUMENTATION AND PHOTOGRAPHY  (1)
  • 1990-1994  (5)
  • 1
    Publication Date: 2013-08-31
    Description: A small, lightweight, and fast-response ozone sensor for various environmental applications is described. At a flow rate of 100 l/min(-1) the ozone sensor has a response time of significantly better than 0.1 s with a detection limit lower than 100 pptv. The ozone sensor was successfully tested in various environmental applications, i.e. in measuring directly the vertical ozone flux onto agricultural land utilizing the eddy correlation or covariance technique and in monitoring horizontal and vertical ozone profiles in the troposphere and stratosphere.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA. Goddard Space Flight Center, Ozone in the Troposphere and Stratosphere, Part 1; p 127-129
    Format: application/pdf
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  • 2
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: This paper discusses various new aspects in the elasticity of rubbers and the statistics of elastomers. It is shown that the role of network topology is crucial in the statistics of rubbers. This is seen mostly on the influence of heterogeneities of crosslink density, which is also of practical interest. Strong heterogeneities lower the modulus, but do not change the stress-strain behavior. It is also shown that if in a given network the flexible chains are replaced by rigid rods which are flexibly hinged the entropy is still of order of that of the flexible network and that the modulus is of the same order as the Gaussian one. This holds for lower functionalities, i.e. less than six. The phase behavior of crosslinked blends and interpenetrating networks is shown to be similar of the microphase transition of block copolymers. Semi IPNs demix at a critical crosslink density of the crosslinked part, or alternatively at a critical length of the free chains, even though if the chains are of the same chemical nature as the crosslink component.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 42 (1991), S. 169-174 
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The stress-strain behaviour of a series of vulcanized products with polybutadiene as the rubber component and sulfur as the crosslinking agent, in the absence and presence of different amounts of carbon black has been studied. Defined correlations were found between the content of carbon black and the measured reinforcement. This dependence can be described with good agreement by a network model, considering phantom chains connected through the conventional chemical junction points (the sulfur bridges between the primary molecules) and additionally through an ensemble of highly dispersed multifunctional filler domains. It is necessary to reconsider the concept that reinforcement of such rubber mixtures after crosslinking is due to physical interactions alone.
    Notes: Das Spannungs-Dehnungs-Verhalten einer Serie von vulkanisierten Proben mit Polybutadien als Kautschukkomponente und Schwefel als Vernetzungsagens wurde in Abwesenheit und Gegenwart unterschiedlicher Gehalte an Ruß untersucht. Dabei wurden eindeutige Korrelationen zwischen dem Gehalt an Ruß und der gemessenen Verstärkung gefunden. Diese Abhängigkeit läßt sich am besten mit einem Netzwerkmdell beschreiben, das von Phantomketten ausgeht, die über die konventionellen chemischen Vernetzungsstellen (Schwefelbrüchen zwischen den Primärmolekülen) und zusätzlich chemisch über hochdisperse multifunktionelle, räumlich ausgedehnte Füllstoffdomänen verknüpft sind. Das Konzept der weitestgehend nur physikalischen Verstärkung bei derartigen Kautschukmischungen auch nach der Vernetzung ist damit neu zu überdenken.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The scattering functions of undeformed and deformed polymer networks are calculated using the Papadopoulos-Thomchick model of macromolecules with stiffness. The calculations show how increasing stiffness leads to a nonconstant Kratky plot in the small-angle scattering region. Such a behaviour differs from the typical plateau region of the flexible Gaussian network chains.
    Notes: Die Streufunktionen underformierter und deformierter Polymernetzwerke aus Netzketten mit Steifigkeit werden im Rahmen des Papadopoulos-Thomchick-Modells berechnet. Es zeigt sich, daß für große Wellenzahlen der Kratky-Plot des PT-Modells nicht in das für Gaußketten typische Plateau einmündet, sondern eine ansteigende Gerade als Asymptote besitzt, deren Anstieg mit wachsender Steifigkeit zunimmt.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 41 (1990), S. 552-553 
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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