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  • 1
    Electronic Resource
    Electronic Resource
    Iron(II) complexes of pyrazol-4,5-dione-5-oximes
    Amsterdam : Elsevier
    Polyhedron 2 (1983), S. 587-589 
    Details
    ISSN: 0277-5387
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0277-5387(00)81515-6
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    CTPB Cure Studies-effect of experimental variables on epoxide cure and properties of gumstocks (1976)
    Weinheim : Wiley-Blackwell
    Propellants, Explosives, Pyrotechnics 1 (1976), S. 33-44 
    Details
    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: The effects of various processing and compositional variables the cure rate and mechanical properties of epoxide-cured CTPB gumstocks have been evaluated.Viscosity changes during the initial stages of cure and tensile properties of fully cured gumstocks are sensitive to the nature and functionality of the epoxide curative even though comparisons are made at epoxy/carboxyl equivalence ratios giving the same density of crosslinks. Batch-to-batch variations in prepolymer structure, functionality and impurities also are important. In particular, glutaric acid impurity inhibits the cure, the effect being very marked when the mixing procedure involves heating the prepolymer and catalyst together before the addition of epoxide.Effects due to plasticisers and ammonium perchlorate filler also are reported. The mechanical behaviour of gumstocks and of corresponding filled systems (propellants) show little correlation.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prep.19760010205
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Radiochemical determination of low unsaturations in polyisobutene (1966)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 4 (1966), S. 2051-2062 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A radiochemical technique involving the use of 36Cl has been described previously for the measurement of butyl rubber unsaturations. This method has now been applied to the estimation of the much lower concentration of double bonds present in polyisobutene prepared by the cationic polymerization of isobutene at a low temperature. The nature of the reaction of polyisobutene with radiochlorine in the absence of air is examined, and the experimental results are discussed in relation to present theories of the mechanisms of chain termination in cationic polymerization.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1966.150040903
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Radiochemical determination of low unsaturations in polyisobutene. Stoichiometry of the reaction between chlorine and branched double bonds (1967)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 5 (1967), S. 1425-1432 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In a previous paper, the radiochemical determination of low unsaturation in polyisobutene was effected by reacting radiochlorine with the double bonds. The reaction is one of substitution rather than addition, and the derivation of true unsaturation values required an assumption to be made regarding the number of chlorine atoms (one or two) incorporated per double bond. In this paper the assumption is tested by examining the stoichiometry of the chlorination of suitable model compounds of known or measurable unsaturation under the experimental conditions used previously. It is found that reaction leads to a monochloro product rather than the dichloro product previously assumed. Conclusions regarding the chain termination process in isobutene polymerization are re-examined in the light of this result.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1967.150050623
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  • 5
    Electronic Resource
    Electronic Resource
    Studies of chlorinated polyisobutenes. Part I. Investigations of structure by proton magnetic resonance and of thermal stability by thermal volatilization analysis (1968)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 6 (1968), S. 205-213 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Polyisobutene was chlorinated in carbon tetrachloride solution at 60°C. with radiochlorine, and the degree of chlorination was determined radiochemically. The extent of chlorination was varied by using a wide range of chlorine/polyisobutene ratios in the reaction mixture. The products were examined by PMR spectroscopy, which showed that both methyl and methylene groups were chlorinated but that the methylene hydrogens were more readily substituted and some disubstitution of the methylene groups occurred. The effect of chlorination on the thermal stability compared to the original polymer was studied by the new technique of thermal volatilization analysis. All the chlorinated derivatives were found to degrade at lower temperatures than polyisobutene. The stability dropped progressively as the chlorine content was increased to one chlorine atom per isobutene unit and then showed less change with further increase in chlorine content.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1968.150060118
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    Paper (German National Licenses)
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