10. Polycondensation techniques

10.1 Mass polycondensation

Most industrial polycondensations are carried out in a melt between 120 and 280 ˚C, or even at higher temperatures in an inert atmosphere, provided the monomers and polymer are thermally stable. Small quantities of diluent may be added if required.

It is important to note that in polycondensation :

• the viscosity of the reaction medium is high only in the final stages of the reaction;

• the temperature rise, due to the heat of reaction, is generally moderate, as most of this heat is released in the early stages of the reaction...