What are the exothermic values for the polymerization of propylene and ethylene, respectively?
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What are the exothermic values for the polymerization of propylene and ethylene, respectively? Thank you. By the way, how are the reaction temperature and pressure chosen for the polymerization of propylene and ethylene?
It is approximately 20–21 kcal/mol, which is equivalent to around 490 kcal/kg. The benchmark is the conversion of liquid monomers into amorphous or microcrystalline polymers; the heat released upon polymerizing 1 kg of propylene is sufficient to evaporate 0.9 kg of water at atmospheric pressure. ***** Calculation of the polymerization heat of common monomers ***** Monomer Polymerization heat kcal/mol kcal/kg Ethylene 22.7 810 Propylene 20.5 488 Butadiene 17.4 322 Isoprene 17.8 262 Styrene 16.7 160 Vinyl chloride 22.9 366 Tetrafluoroethylene 41.1 411