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  • Chemistry  (2)
  • 03. Hydrosphere::03.01. General::03.01.06. Paleoceanography and paleoclimatology
  • 1985-1989  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 165 (1989), S. 181-196 
    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: Multiblock copolymers involving crystallizable blocks of poly(1-dimethylsilyl-4-dimethylethylenesilyl benzene) and blocks of either polystyrene (PS) or poly(ethyleneoxide) (PEO) were prepared by hydrosilylation reaction between α,ω-difunctional precursor polymers. The organosilicic precursor was fitted at both chain-ends with dimethylsilane functions. The reactive end groups of the PS or PEO precursors were silvinylic functions attached to the polymer chains through chemical groups of the same nature as the monomer unit of the crystallizable block. In this case, and under adequate stoichiometric conditions the hydrosilylation reaction between functional chain ends is possible and yields multiblock copolymers containing 6 to 10 blocks.
    Notes: Des copolymères multiséquencés comportant des séquences cristallisables de poly(diméthylsilyl-1 diméthyléthylènesilyl-4 benzène) et des séquences, soit de polystryrène (PS), soit de poly(oxyéthylène) (POE), ont été préparés par réaction d'hydrosilylation entre polymères précurseurs, α,ω-difonctionnels. Le polymère organosilicique utilisé portait des fonctions diméthylsilane aux deux extrémités de sa chaîne. Les polymères précurseurs PS et POE étaient dotés aux deux extrémités de leur chaîne de fonctions silvinyliques portées par un motif chimique de même nature que celle de l'unité monomère de la séquence organosilicique. Dans des conditions expérimentales adéquates, la réaction d'hydrosilylation conduit alors à des copolymères multiséquencés comportant 6 à 10 séquences.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Propellants, Explosives, Pyrotechnics 12 (1987), S. 92-96 
    ISSN: 0721-3115
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: In the environmental qualification of chemical energetics, influences from the environment occurring in production, logistics and applications are simulated. The attempt was thus made to demonstrate or, respectively, to estimate the manipulation safety, functional behaviour and life time of energetic materials. It is here the usual method to intensify simulated environmental influences for the purpose of accelerating tests. In this paper the example of mechanical load simulation is used to demonstrate how knowledge of the behaviour of the material is necessary for an ingenious modelling and a rational increasing of test levels. Apart from the microscopic and macroscopic point of view, especially the so called “micromorphological” observation level is well suited to this purpose.
    Additional Material: 17 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
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