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V. Liška


Chemorheology of epoxide resins


Polimery 1980, No 6-7, 219


DOI: dx.doi.org/10.14314/polimery.1980.219

Summary

A new method for presenting the characteristics of thermosetting resins by means of critical values has been described. From rheological measurements on „living” epoxide compositions — and by application of a mathematical model concerning the first stage of the curing reaction — four principal constants are determined which serve for calculation of the critical viscosities and critical times corresponding to each critical temperature as well as the integral critical stability. This set of values unequivocally characterizes the reacting system. The determination of the conversion of epoxide groups at the critical state, equal to 5—25 per cent, gives an evidence that the critical state is formed in epoxide; systems at a stage previous to gelation, when the compositions still exhibit high fluidity and no crosslinking takes place.


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