The first part- "dissolution" is clearly exothermic process, with consuming water. But why second part "polycondensation" is exothermic? I think that the realease of water should be endothermic.
I attached the conceptual model
Release of water is endothermic only if you deal with a single, purely physical, process. But here you deal with a chemical reaction. Calculation of enthalpy cleartly shows that polymerisation is exothermic, and release of water is only a small part of the whole process, which globally produces a significant amount of heat.
Alain
Release of water is endothermic only if you deal with a single, purely physical, process. But here you deal with a chemical reaction. Calculation of enthalpy cleartly shows that polymerisation is exothermic, and release of water is only a small part of the whole process, which globally produces a significant amount of heat.
Alain
For a discussion focusing structural aspects from geopolymerization of inorganic polysialates you may check section 7-8 at: J. Šesták, C.A. Queiroz, B. Foller, Ch. 3 in: D. Křemenáková, R. Mishra, J. Militký, J. Šesták (Eds.), "Selected topics of textile and material science", Publishing House of West Bohemian University, Pilsen, 2011, pp. 53-75.
Chapter Some aspects of vitrification, amorphisation and idiosyncrat...
- Badges
- Science topic
- Similar topics
- Engineering
- Materials Engineering