Is polymerization endothermic or exothermic

Answer 1

Exothermic, because the reaction enthalpy must be negative.

With polymerization, the entropy decreases. The Gibbs energy has to be negative. Thus negative reaction enthalpy.

Gibbs energy = reaction enthalpy - temperature*entropy

Answer 2

Polymerization can be either endothermic or exothermic, depending on the specific monomers and reaction conditions involved. Some polymerization reactions release energy (exothermic), while others may require energy input (endothermic) to overcome activation barriers.