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Fine structures and fracture processes in plastic‐rubber two‐phase polymer systems III. Temperature dependence of Charpy impact strength
Author(s) -
Matsuo M.,
Ueda A.,
Kondo Y.
Publication year - 1970
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760100502
Subject(s) - charpy impact test , materials science , composite material , natural rubber , polymer , izod impact strength test , toughness , atmospheric temperature range , adhesive , ultimate tensile strength , thermodynamics , physics , layer (electronics)
Abstract Notched Charpy impact strengths of a series of plasticrubber two‐phase polymer systems were measured over a wide range of temperatures. Blends of polyvinylchloride and rubbers with varying chemical structures, and several ABS polymers were investigated. In all systems, Charpy impact strength began to increase near the T g of the rubber component followed by a logarithmic increase with increasing temperature. The trend is expressed by the following empirical relation:\documentclass{article}\pagestyle{empty}\begin{document}$$ I{\rm = }A{\rm exp(- }B/T{\rm)} $$\end{document}where I is Charpy impact strength, A and B are constants, and T is the absolute temperature. This equation is applicable between the T g 's of the plastic and the rubber components. The increasing tendency of impact strength, i.e. the B value of the above equation, is depressed mainly by the decrease of the compatibility and/or the interfacial adhesive force between the two phases. Toughening mechanism and the ways of increasing toughness are discussed based on the craze formation mechanism.