The Activation Energy for Propagation formula is the minimum amount of extra energy required by a reacting molecule to convert into a product and is represented as Ep = ΔHp+Edp or Activation Energy for Propagation = Heat of Polymerization+Activation Energy for Depolymerization. The Heat of Polymerization is the change of enthalpy during polymerization & Activation Energy for Depolymerization is the minimum amount of extra energy required by a reacting molecule to get converted into product in depolymerization.