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 periodmore 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. ZUSAMMENFASSUNG:Empirische Beziehungen, die die Anderung der mechanischen Eigenschaften von Polyolefinen bei natiirlicher Alterung in einem Meeresklima in mittleren geographischen Breiten beschreiben, wurden aus wtihrend eines Bewitterungszeitraumes von mehr als zehn Jahren gewonnenen experimentellen Daten erhalten. Die empirische Gleichung beschreibt die experimentellen Daten mit guter Genauigkeit . Zur Beriicksichtigung des Zeitraumes, in dem sich die Eigenschaften nicht vertindern (Induktionsperiode), wurde eine Konstante eingefiihrt. Die erhaltenen empirischen Gleichungen k h n e n zur Vorhersage der Anderung von mechanischen Eigenschaften der untersuchten Polymeren bei Anwendung im Freien dienen.
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.
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