Polycondensation and autocondensation networks in polyflavonoid tannins. II. Polycondensation versus autocondensation

The curves of increase of modulus as a function of temperature obtained by thermomechanical analysis (TMA) of joints bonded with different polyflavonoid tannins–hardener systems show a succession of different plateaus. Equally, the increase of modulus first-derivate curves show a succession of several peaks. Both the position and extent of the plateaus of the modulus curve as well as the peaks of its first derivate curve show considerable...