symbols: $\Delta H_{\rm{m}}$, $\Delta_{\rm{ab}} H_{\rm{m}}$; unit: $\pu{J mol-1}$
synonym: molar enthalpy of polymerization
https://doi.org/10.1351/goldbook.15399
Change of enthalpy, in a chain polymerization forming a homopolymer, associated with the conversion of one mole of monomer into polymer under isobaric and isothermal conditions.
Notes:
- Under defined standard conditions the enthalpy of polymerization is designated \(\Delta H_{\rm{m}}^{\circ}\).
- The subscripts in \(\Delta_{\rm{ab}} H_{\rm{m}}\) denote (a) the state of the monomer and (b) the state of polymer, as follows:
- g: gaseous state (hypothetical in the case of polymer);
- l: liquid state (must be specified in the case of a mesophase);
- s: in solution (solvent and mesophases, if any, must be specified);
- c: (condensed) amorphous, glassy states;
- c′: crystalline or partly crystalline state;
- The symbol \(\Delta H_{\rm{ab}}\), in common usage in polymer chemistry, is discouraged as the IUPAC-recommended symbol is \(\Delta_{\rm{ab}} H_{\rm{m}}\).