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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 141 (1986), S. 95-101 
    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: Empirische Beziehungen, die die Änderung der mechanischen Eigenschaften von Polyolefinen bei natürlicher Alterung in einem Meeresklima in mittleren geographischen Breiten beschreiben, wurden aus während eines Bewitterungszeitraumes von mehr als zehn Jahren gewonnenen experimentellen Daten erhalten. Die empirische Gleichung beschreibt die experimentellen Daten mit guter Genauigkit. Zur Berücksichtigung des Zeitraumes, in dem sich die Eigenschaften nicht verändern (Induktionsperiode), wurde eine Konstante eingeführt. Die erhaltenen empirischen Gleichungen können zur Vorhersage der Änderung von mechanischen Eigenschaften der untersuchten Polymeren bei Anwendung im Freien dienen.
    Notes: Empirical relationships, describing the change in mechanical properties of polyolefins at natural ageing in a seaside climate at middle geographic latitudes are derived on the basis of experimental data collected in a long exposure period  -  more than 10 years. The empirical equations describe the experimental data with a good accuracy. A constant is introduced accounting for the period in which the properties remain unchanged (induction period). The empirical equations derived may be used in predicting the change in mechanical properties of the investigated polymers in outdoor applications.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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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: A base of experimental data on the ageing of commerial grade plastics is created. In includes assorted physical and chemical properties of plastics and their changes at natural ageing. An automated system for storing and processing of the experimental data is designed. Processing involves mathematical modeling of the changes in properties that aids in empirical prediction. The possibilities of the system are verified with experimental results from a 5-year ageing period of PE-LD and PE-HD. The results show a good agreement between the predicted and real data for selected models.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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