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Improvement of the Long‐Term Performance of Impact‐Modified Polycarbonate by Selected Heat Treatments
Author(s) -
Engels Tom A. P.,
Schrauwen Bernard A. G.,
Govaert Leon E.,
Meijer Han E. H.
Publication year - 2009
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.200800262
Subject(s) - materials science , polycarbonate , composite material , scaling , izod impact strength test , annealing (glass) , yield (engineering) , polymer , toughness , ultimate tensile strength , mathematics , geometry
Next to the intended increase of the impact toughness, impact modification of polycarbonate generally results in an unwanted decrease in yield stress and time‐to‐failure under constant stress. It is demonstrated that this loss in strength can be fully compensated for by an annealing treatment, or by increasing the mold temperature. The influence of impact modification on the short‐ and long‐term strengths of glassy polymers is predicted by the extension of existing models with a scaling rule based on the filler volume percentage. Introduction of this scaling rule in the evolution of yield stress during physical aging even allows for the direct prediction of yield stress on the basis of processing conditions.